Unlocking Permits: Understand Building Regulations Quickly

A to Z Glossary of Definitions and Terms Used in the National Building Regulations Code of Practice

Every industry has terms and definitions that are specific to that industry, and the building industry is no exception. This glossary of National Building Regulations definitions forms part of the National Building Regulations and Building Standards Act (Act 103 of 1977 which has been amended several times, most recently in 2008).

Note that every individual Standard in SANS 10400, which form a body of knowledge that shows those in the industry how to apply the South African National Building Regulations, has its own bank of definitions at the beginning of the Standard. Many of these are the same as those published as part of the legislation.

All the individual Standards that form part of SANS 10400: The application of the National Building Regulations, also have a list of additional Standards (both South African and international) that are relevant to that part, and need to be taken into account during the building process.

A

“absorption field” An on-site effluent system, such as a french drain or evapo-transpirative bed;

“acceptable”, “adequate” or “satisfactory“ means acceptable, adequate or satisfactory –

(a) in the opinion of any local authority; or

(b) in relation to any document issued by the council, in the opinion of the council;

“access” An approach, entry or exit

“accessible” The characteristic of a building, that can be reached, entered and used; NOTE Accessibility is evaluated in terms of the safe, comfortable and convenient use of the site, building or facility by persons with disabilities.

“accessible building” A building that complies with the requirements of part of SANS 10400-S:2011

“access door” means an entrance door to an emergency route;

“action” means an assembly of concentrated or distributed mechanical forces acting on a building or the cause of deformations imposed on the building or constrained in it;

“agrément certificate” means a certificate that confirms fitness-for-purpose of a non- standardised product, material or component or the acceptability of the related non-standardised design and the conditions pertaining thereto (or both) issued by the Board of Agrément South Africa;

“air conditioning system” means a system of mechanical ventilation where air that has been cleansed is supplied to a building under conditions of controlled temperature, humidity, distribution and movement;

“air duct” means any pipe, tube, conduit or enclosed space used or to be used in any building for the transmission of air in an artificial ventilation system;

“applicant” means any person who makes an application;

“application” means an application contemplated in section 4 of the Act;

“approval” means –

(a) approval by any local authority, including approval contemplated in section 7(7)(b) of the Act; or

(b) approval by the review board on appeal to the review board in terms of the Act;

“approved” means-

(a) approved by any local authority; or

(b) approved by the review board on appeal to the review board in terms of the Act;

“artificial ventilation system” means a system in which air is caused to circulate through a room by means of a mechanical apparatus which forces air into or extracts air from such room;

“automatic” in relation to fire-doors, fire-shutters, fire-dampers, fire-alarms, or fire extinguishing equipment means fitted with an approved device which is activated by a predetermined amount of heat, smoke, combustion gases or flame without the need for any manual operation;

B

“backflow” means the flow of water in any pipe in a direction opposite to the normal direction of flow;

“back siphonage” means the backflow of water resulting from negative pressure in a water installation or in the water supply system;

“back vent” means a ventilating pipe connecting a branch discharge pipe, to which unvented fixture discharge pipes are connected, to a vent stack or to a stack vent;

“balustrade wall” means a wall serving the purpose of a balustrade;

“block” means any masonry unit which has a length of more than 300 mm or a width of more than 130 mm;

“Board of Agrément” is the body that operates under the delegation of authority of the Minister of Public Works;

“branch discharge pipe” means a horizontal discharge pipe conveying the discharge from one or more sanitary fixtures to a discharge stack;

“branch drain” means any drain which discharges into a main drain;

“branch vent” means a horizontal ventilating pipe connecting two or more trap vents to a vent stack or to a stack vent;

“brick” means any masonry unit which is not a block;

“building” includes:
a) any structure, whether of a temporary or permanent nature, and irrespective of the materials used in the erection thereof, erected or used in connection with

1) the accommodation or convenience of human beings and animals;

2) the manufacture, processing, storage, display or sale of goods;

3) the rendering of a service;

4) the destruction or treatment of refuse or other waste materials; and

5) the cultivation or growing of plants or crops;
b)  a wall, swimming bath, swimming pool, reservoir or bridge or any structure connected therewith;
c)  a fuel pump or tank used in connection therewith;
d)  any part of a building, including a building as defined in (a), (b) or (c); and
e)  any facilities or system, or portion thereof, within or outside but incidental to a building, for the provision of a water supply, drainage, sewerage, stormwater disposal, electricity supply or other similar service in respect of the building;

“building component” part of a building other than a building element;

“building element” wall, floor, foundation or roof of a building;

“building height” means the dimensional height in metres measured from the lowest ground level abutting any part of the building to the level of –

(a) the underside of a flat roof; or

(b) the underside of the roof of any plant room on such flat roof where the plan area of the plant room is more than 10% of the area of such flat roof; or

(c) a horizontal ceiling which is immediately under any pitched roof; or

(d) half-way between the eaves level and the ridge of any pitched roof where there is no ceiling below such roof or where the ceiling follows the pitch of such roof;

“building line” in relation to a site, means a line prescribed in any town planning scheme or any other law designating the boundaries of the area of the site outside of which the erection above ground of any building is prohibited;

C

“capacity” of any storage tank means the volume of such tank between the operating level of the water contained in such tank and the invert of the outlet from the tank;

“carport” means a building intended to provide shelter for a motor vehicle, caravan or boat and having a roof but having walls on not more than two sides;

“category 1 building”  A building which

a) is designated as being of class A3, A4, F2, G1, H2, H3, or H4 occupancy (see Regulation A20 in annex A),

b) has no basements,

c) has a maximum length of 6,0 m between intersecting walls or members providing lateral support, and

d) has a floor area that does not exceed 80 m²

NOTE 1 Table C.1 outlines the difference in performance between category 1 buildings and other buildings that have the same occupancy designation in respect of a number of building attributes.

NOTE 2 A building may be classified as a category 1 building for the purposes of one or more parts of SANS 10400. Additional limitations may accordingly be imposed on category 1 buildings. For example, a category 1 building in terms of SANS 10400-T (Fire protection) will be restricted to a single storey.

NOTE 3 Fire requirements for category 1 buildings are based on occupants escaping quickly from buildings. The design population for occupancies as set out in table 2 of part A of the National Building Regulations (see annex A) should therefore not be exceeded.

“chemical closet/toilet” means a closet/toilet with a fixed pan, the excreta from which pass into a tank where they are acted upon by chemicals which sterilize and break them down;

“chimney” means that part of a building which forms part of a flue, but does not include a flue pipe;

“cleaning eye” means any access opening to the interior of a discharge pipe or trap provided for the purposes of internal cleaning, and which remains permanently accessible after completion of the drainage installation;

“combustible” Is not classified as non-combustible when tested in accordance with SANS 10177-5;

“common drain” means that portion of a drain which conveys sewage other than or in addition to that sewage which emanates from the site through which such drain runs;

“communication pipe” means any pipe in a water supply system to which any water installation is connected;

“competent person” means a person who is qualified by virtue of his education, training, experience and contextual knowledge to make a determination regarding the performance of a building or part thereof in relation to a functional regulation or to undertake such duties as may be assigned to him in terms of these National Building Regulations;

“competent person” (civil engineering)  A person who

a) is registered in terms of the Engineering Profession Act, 2000 (Act No. 46 of 2000), as either a Professional Engineer or a Professional Engineering Technologist,

b) has a tertiary qualification (degree or diploma) in civil engineering, and

c) is generally recognized as having the necessary experience and training to undertake rational assessments or rational designs in the field of civil engineering;

“competent person” (engineering geology) A person who is registered as a Professional Natural Scientist in terms of the Natural Scientific Professions Act, 2003 (Act No. 27 of 2003), and has a BSc (Hons) degree or higher qualification in engineering geology;

“connecting sewer” means a pipe vested in the local authority which connects a drain to a sewer;

“conservancy tank” means a covered tank used for the reception and temporary retention of sewage and which requires emptying at intervals;

“consumer” means any person who is obtaining a supply of water from the local authority;

“contaminated land” means any land that, due to substances contained within or under it, is in a condition that presents an unacceptable risk to the health and safety of occupants of buildings constructed on such land;

“council” means the Council of the South African Bureau of Standards;

“cross vent” means a ventilating pipe connecting a discharge stack to a vent stack;

D

“dark room” means any room used for the purposes of handling or processing light sensitive material;

“dead-end corridor” means any corridor along which it is possible to travel only in one direction in order to reach a feeder route or emergency route;

“dead load” means the gravitational force caused by the static mass of all permanent parts of a building;

“deemed-to-satisfy provision” means non-mandatory requirement, the compliance with which ensures compliance with a functional regulation;

“deemed-to-satisfy rule” (or rule) means a non-mandatory provision which describes a method of design or construction that is deemed to comply with a particular functional regulation;

“developed length” of any pipe means the length between two specified points on such pipe measured along the centre line of such pipe, including any bend, junction or similar fitting;

“discharge pipe” means a pipe which conveys the discharge from a sanitary fixture to a drain, and includes a soil pipe, a waste pipe, a discharge stack, a branch discharge pipe or a fixture discharge pipe;

“discharge stack” means any vertical discharge pipe which conveys the discharge from two or more sanitary fixtures and which are connected directly to a drain;

“division” means a portion of a building separated from the remainder of such building by one or more separating elements;

“division wall” means an internal wall that separates one division from another division in any building and that has a fire resistance of not less than that required by these National Building Regulations;

“dolomite land” means land underlain by dolomite or limestone rock directly or at a shallow depth less than:

(a) 60 m in areas underlain by limestone;

(b) 60 m in areas underlain by dolomite where no de-watering has taken place and the local authority has jurisdiction, is monitoring and has control over the groundwater levels over the areas under consideration; or

(c) 100 m in areas underlain by dolomite where de-watering has taken place or where the local authority has no jurisdiction or control over ground water levels;

“domestic effluent” means sewage consisting of soil water or waste water or a combination of both;

“drain” means that part of any drainage installation outside a building and which is below ground level, but shall not include the following –

(a) any discharge pipe;

(b) that portion of a discharge stack which is below ground level;

(c) the bend at the foot of a discharge stack;

“drainage installation” means any installation vested in the owner of a site and which is situated on such site and is intended for the reception, conveyance, storage or treatment of sewage, and may include sanitary fixtures, traps, discharge pipes, drains, ventilating pipes, septic tanks, conservancy tanks, sewage treatment works, or mechanical appliances associated therewith;

“drencher system” means an approved system of piping and outlets which, when actuated manually or by the action of fire, releases a continuous curtain of water;

“dwelling house” means a single dwelling unit and any garage and other domestic outbuildings thereto, situated on its own site;

“dwelling unit” means a unit containing one or more habitable rooms and provided with adequate sanitary and cooking facilities;

E

“electrical sanitary fixture” means a device which is connected to an electricity supply and to a water supply to perform a function such as the washing of clothes or dishes, or rendering waste matter suitable for disposal into a discharge pipe and includes a food-waste disposer, and a sanitary-towel disposer;

“emergency route” means that part of an escape route which provides fire protection to the occupants of any building and which leads to an escape door;

“escape door” means that door in an escape route which, at ground level, leads directly to a street or public place or to any approved open space which leads to a street or public place;

“escape route” means the entire path of travel from the furthest point in any room in a building to the nearest escape door and may include an emergency route;

“evapo-transpirative bed” means an effluent disposal system comprising a shallow sand-filled excavation covered with top soil and planted over with suitable vegetation;

“exit door” means any door that is a component of an escape route from any room;

F

“feeder route” means that part of an escape route which allows travel in two different directions to the access doors to at least two emergency routes;

“fire-damper” means an automatic damper and its assembly that complies with the requirements contained in SANS 193;

“fire-door” or “fire-shutter” means an automatic or self-closing door or shutter assembly especially constructed to prevent the passage of fire for a specific length of time;

“fire installation” means any water installation which conveys water solely for the purpose of fire-fighting;

“fire load” means the sum of the heat energy values of all combustible materials, including combustible partitions and other exposed combustible elements, contained in a compartment or division;

“fire resistance” means the shortest period for which a building element or component will comply with the requirements for stability, integrity and insulation when tested in accordance with SANS 10177-2;

“fire-stop” means a draft tight barrier or seal placed within or between building elements in shafts, voids and other concealed spaces to retard the spread of flame, heat or smoke;

“fixture branch” means a horizontal fixture discharge pipe;

“fixture discharge pipe” means a discharge pipe which conveys the discharge from a single sanitary fixture;

“fixture unit” means an arbitrary unit of measure for expressing the hydraulic loading on a drainage installation;

“fixture unit rating” means the value in fixture units assigned to a sanitary fixture from a consideration of the duration of its discharge, the interval between discharges and its mean discharge rate;

“flammable” means having a closed cup flash point lower than 90 °C;

“floor area” in relation to a building or a storey thereof, means the total area enclosed within its external walls, exclusive of the area occupied by any lift shaft;

“flight” means that part of a stairway which consists of consecutive steps;

“flue” means a passage which conveys the discharge of a heat generating appliance to the external air;

“flue pipe” means a pipe forming a flue but does not include a pipe built as a lining into a chimney;

“foundation” means that part of a building which is in direct contact with and is intended to transmit loads to the ground;

“foundation wall” means that portion of a wall between the foundation and the lowest floor above such foundation;

“free-standing wall” means a wall, not being a retaining wall, without lateral support;

“french drain” means a trench filled with suitable material which is used for the disposal of liquid effluent from a septic tank or waste water;

“functional regulation” means a regulation that sets out in qualitative terms what is required of a building or building element or building component in respect of a particular characteristic without specifying the method of construction, dimensions or material to be used;

G

“garage” means an enclosed area which is used or intended to be used for the parking, storing, servicing or repairing of motor vehicles;

“general installation” means any water installation which conveys water for any purpose other than fire-fighting;

“geotechnical site investigation” the process of evaluating the geotechnical character of a site in the context of existing or proposed works or land usage, which may include one or more of the following:

(a) evaluation of the geology and hydrogeology of the site;

(b) examination of existing geotechnical information pertaining to the site;

(c) excavating or boring in soil or rock and the systematic description of the soil and rock profiles;

(d) determining the depth of any fill that might be present;

(e) in-situ assessment of geotechnical properties of materials;

(f) recovery of samples of soil or rock for examination, identification, recording, testing or display;

(g) testing of soil or rock samples to quantify properties relevant to the purpose of the investigation;

(h) evaluation of geotechnical properties of tested soils; and

(i) reporting the results;

“going” means the distance (measured on plan) between the nosing of a tread and the nosing of the tread or landing next above it;

“gully” means a pipe fitting incorporating a trap into which waste water is discharged;

H

“habitable room” means a room used or designed, erected, adapted or intended to be used by persons for sleeping in, living in, the preparation or consumption of food or drink, the transaction of business, the rendering of professional services, the manufacture, processing or sale of goods, the performance of work, the gathering together of persons or for recreational purposes;

“height” means building height;

“high risk substance” means any substance listed in the schedule to the Administrative Regulations, as amended, made in terms of the Machinery and Occupational Safety Act, 1983 (Act 6 of 1983);

“horizontal” in relation to a discharge pipe or ventilating pipe, means inclined at less than 45° to the horizontal;

I

“imposed load” means any force assumed in the design of any building, caused by the intended occupancy thereof or by earth pressure, snow, hail, groundwater or the pending of rainwater;

“industrial effluent” means any liquid whether or not containing matter in solution or suspension which is given off in the course of or as a result of any industrial, trade, manufacturing, mining or chemical process or any laboratory, research or agricultural activity, and includes any liquid other than soil water or stormwater;

“inspection” means the general inspection by a competent person of a system or measure or installation of a building, or part thereof, at such intervals as might be necessary in accordance with accepted professional practice to enable such competent person to be satisfied that the design assumptions are valid.

The design is being correctly interpreted and the work is being executed generally in accordance with the designs, appropriate construction techniques and good practice but shall exclude detailed supervision and day-to-day inspection;

“inspection chamber” means a chamber not deeper than 750 mm and of such dimension that access may be obtained to a drain without requiring a person to enter into such chamber;

“inspection eye” means any access opening to the interior of any pipe or pipe fitting in a drainage installation provided solely for the purpose of inspection and testing, and to which permanent access after completion of the drainage installation need not be provided;

L

“laminated glass” means two sheets of ordinary annealed glass bonded to a shear and impact resistant plastic interlayer;

“laminated toughened glass” means a laminated glass where one or both sheets of ordinary annealed glass are replaced by a sheet or sheets of toughened glass;

“landing” means a platform between two consecutive flights of a stairway;

“lateral boundary” means a boundary of a site other than a boundary between such site and any street or public place with a width of more than 6 m measured at right angles to such boundary;

“load” means the value of a force corresponding to an action;

M

“main drain” means the longest run of drain from a building to a common drain, to a means of sewage disposal situated on the site concerned, or to a connecting sewer;

“manhole” means a chamber of a depth greater than 750 mm and of such dimension that allows entry of a person into such chamber for the purpose of providing access to a drain;

“masonry wall” means an assemblage of masonry units joined together with mortar or grout;

“mezzanine storey” means any mezzanine storey the floor area of which does not exceed 25% of that of the floor below it;

“minor building work” as contemplated in section 13 of the Act means-

(a) the erection of any-
(i) poultry house not exceeding 10 sq m in area;
(ii) aviary not exceeding 20 sq m in area;
(iii) solid fuel store not exceeding 10 sq m in area and 2 m in height;
(iv) tool shed not exceeding 10 sq m in area;
(v) child’s playhouse not exceeding 5 sq m in area;
(vi) cycle shed not exceeding 5 sq m in area;
(vii) greenhouse not exceeding 15 sq m in area;
(viii) open-sided car, caravan or boat shelter or a carport where such shelter or carport does not exceed 40 sq m in area;
(ix) any free-standing wall constructed of masonry, concrete, steel, aluminium or timber or any wire fence where such wall or fence does not exceed 1,8 m in height at any point above ground level and does not retain soil;
(x) any pergola;
(xi) private swimming pool;
(xii) change room, not exceeding 10 sq m in area, at a private swimming pool;

(b) the replacement of a roof or part thereof with the same or similar material;

(c) the conversion of a door into a window or a window into a door without increasing the width of the opening;

(d) the making of an opening in a wall which does not affect the structural safety of the building concerned;

(e) the partitioning or the enlarging of any room by the erection or demolition of an internal wall if such erection or demolition does not affect the structural safety of the building concerned;

(f) the erection of any solar water heater not exceeding 6 sq m in area on any roof or 12 sq m when erected other than on any roof; and

(g) the erection of any other building where the nature of the erection is such that in the opinion of the building control officer it is not necessary for the applicant to submit, with his application, plans prepared in full conformity with these National Building Regulations;

N

“natural ventilation” means the movement of air through a building due to natural causes;

“non-combustible” means classified as non-combustible when tested in accordance with code of practice SANS1 0177-5;

“non-structural wall” means a wall which does not form part of a structure but which may from time to time be subject to forces other than its own weight;

“nosing” means the front edge of a tread and includes the front edge of the top surface of any landing which is situated at the top of a flight;

O

“obstruction” means any building or other object which partially or completely intersects any zone of space serving a window but shall not include any narrow object such as a pole or railing which does not materially obstruct the entry of light and air to the opening concerned;

“occupancy” means the particular use or the type of use to which a building or portion thereof is normally put or intended to be put. Regulation A20 classifies and designates occupancies (see SANS 10400-A);

“one-pipe system” means a system of piping between sanitary fixtures and a drain in which both waste and soil water discharge down a common discharge stack and in which any trap venting or other venting that is required may be via a common vent stack;

“operating water level” means the level of water reached in any storage tank when the valve controlling the inlet of water to such tank closes under normal operating conditions;

“outside air” means air which is drawn into the building from the outside and which has not been circulated through such building;

“overflow gully” means a gully which allows the overflow of sewage but prevents the ingress of foreign matter, including rainwater directly from above;

P

“partition” means an interior construction less than one storey in height and is generally of a light construction and is demountable;

“partition wall” means a non-structural internal wall extending to the ceiling and constructed for the purpose of subdividing a space;

“persons with disabilities” means those persons who have long-term physical, mental, intellectual or sensory impairments which in interaction with various barriers might hinder their full and effective participation in society on an equal basis with others;

“pitch line” means a notional line which connects the nosings of all the treads in a flight or stairs;

“population” means the population determined in accordance with regulation SANS 10400-A21;

“prescriptive regulation” means a regulation which describes in some detail an operation to be performed, or the dimensions of a building, building element or building component and the materials and method of construction to be used in such building, building element or building component;

“prescriptive rule” means a rule or regulation which describes in some detail an operation to be performed, or the dimensions of a building, building element or building component and the materials and method of construction to be used in such building, building element or building component;

“pressurization” means the creation of a positive air pressure differential between one area of and the remainder of a building and “pressurized” shall have a corresponding meaning;

“public place” means any square, park, recreation ground or open space which-

(a) is vested in the local authority; or

(b) the public has the right to use; or

(c) is shown on a general plan of a township filed in a deeds registry or a Surveyor-General’s office and has been provided for or reserved for the use of the public or the owners of erven in such township;

 “purlin beam” A beam that is parallel to the eaves and that serves the purpose of a rafter;

R

“range” means a number of like sanitary fixtures closely spaced and discharging to a common branch discharge pipe which does not receive the discharge from any other sanitary fixture not in the range;

“rational assessment” means assessment by a competent person of the adequacy of the performance of a solution in relation to requirements including, as necessary, a process of reasoning, calculation and consideration of accepted analytical principles, based on a combination of deductions from available information, research and data, appropriate testing and service experience;

“rational design” means any design by a competent person involving a process of reasoning and calculation and which may include a design based on a standard or other suitable document;

“regulation” (NBR) means national building regulation;

“resealing trap” means a trap so designed that some of the water forming its seal is retained during siphonic action to reseal after siphonage has been broken;

“retaining wall” means a wall intended to resist the lateral displacement of materials;

“rodding eye” means an access opening in a drainage installation provided for the purposes of gaining full-bore access to the interior of a drain for internal cleaning, and which remains permanently accessible after completion of the installation, but does not include an inspection chamber or manhole;

S

“safety distance” means the distance provided between any building and the lateral boundary of the site, or where there are two buildings on the same site, the distance provided between each such building and a notional boundary line between them, so that spread of fire from one building to another due to effect of radiant heat will be minimized;

“safety glass” means a safety glazing material consisting primarily of glass;

“safety glazing material” means any material which complies with the requirements for the performance of safety glazing materials contained in SANS 1263-1;

“sanitary fixture” means a receptacle to which water is permanently supplied, and from which waste water or soil water is discharged;

“self-closing” in relation to a door, fire-door, shutter or fire-shutter means equipped with a device to ensure immediate closing of such door, fire-door, shutter or fire-shutter after having been opened;

“separating element” means a wall or floor, which shall have a specific fire resistance, used between divisions, occupancies or tenancies in a building;

“septic tank” means a tank designed to receive sewage and to retain it for such a time and in such a manner as to secure adequate decomposition;

“service pipe” means any pipe which is part of a water installation and which is connected to any communication pipe;

“sewage” means waste water, soil water, industrial effluent and other liquid waste, either separately or in combination, but does not include stormwater;

“sewer” means a pipe or conduit which is the property of or is vested in the local authority and which is used or intended to be used for the conveyance of sewage;

“SHGC – solar heat gain coefficient” The ratio of the heat gain entering the space through the fenestration area to the incident solar radiation;

“single-stack system” means a particular one-pipe system in which trap vents are not required in terms of specific criteria set out in Part P;

“site” means any erf, lot, plot, stand or other piece of land on which a building has been, is being or is to be erected;

“soil branch” means a branch discharge pipe which conveys soil water;

“soil fixture” means a sanitary fixture which receives and discharges soil water;

“soil pipe” means a discharge pipe which conveys soil water;

“soil water” means liquid containing excreta;

“spiral stairway” means any succession of tapered treads forming a curved stairway which extends as a single flight from one floor to another and which has a minimum radius of curvature of less than 100 mm;

“sprinkler system” means an approved system of piping and sprinkler heads connected to a water supply which when actuated by the effect of fire automatically releases water;

“stack vent” means a ventilating pipe connecting to a discharge stack above the highest connected discharge pipe;

“stairway” means any part of a building which provides a route of travel between different levels in such building and is formed by a single flight or by a combination of two or more flights and one or more intervening landings;

“storage tank” means any tank, other than any tank used for storage of hot water or any cistern serving a toilet pan or a urinal, which forms part of a water installation and is used for the storage of water;

“storey” means that part of a building which is situated between the top of any floor and the top of the floor next above it, or if there is no floor above it that portion between such floor and the ceiling above it (any open work floor, catwalk or gallery being taken to be part of the storey in which it is situated), and in relation to a building-

(a) the ground storey shall be taken as the storey in which there is situated an entrance to the building from the level of the adjoining ground or, if there is more than one such storey the lower or lowest of these;

(b) a basement shall be taken to be any part of the building which is below the level of the ground storey;

(c) an upper storey shall be taken to be any storey of the building which is above the level of the ground storey; and

(d) the height expressed in storeys shall be taken to be that number of storeys which includes all storeys other than a basement;

“stormwater” means water resulting from natural precipitation or accumulation and includes rainwater, surface water, subsoil water or spring water;

“stormwater drain” means a pipe, conduit or surface channel situated on a site, which is used to convey stormwater to a suitable point of discharge;

“stormwater sewer” means a pipe, conduit or channel, owned by or vested in the local authority, which is used for the conveyance of stormwater;

“street” means any street, road, thoroughfare, lane, footpath, sidewalk, sub- way or bridge which-

(a) is vested in the local authority; or

(b) the public has the right to use; or

(c) is shown on a general plan of a township filed in a deeds registry or a Surveyor-General’s office and has been provided or reserved for use by the public or the owners of erven in such township;

“structural” means relating to or forming part of any structural system;

“structural system” in relation to a building, means the system of constructional elements and components of any building which is provided to resist the loads acting upon it and to transfer such loads to the ground upon which the foundation of the building rests;

“structural wall” means a wall forming part of any structural system;

“stub stack” means a straight 100 mm diameter discharge stack not more than one storey high with a rodding eye at its top;

“suitable” means capable of fulfilling or having fulfilled the intended function or fit for its intended purpose;

“surface fire index” means a classification awarded to a combustible surfacing material (in excess of 1 mm in thickness) when tested in accordance with SANS 10177-3;

“suspended ceiling” means any ceiling supported on a system of hangers;

T

“tapered tread” means a tread which has a greater width at one side than at the other and a going which changes at a constant rate throughout its length;

“temporary building” means any building that is so declared by the owner and that is being used or is to be used for a specified purpose for a specified limited period of time, but does not include a builder’s shed;

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“the Act” means the National Building Regulations and Building Standards Act, 1977 (Act No. 103 of 1977);

“toughened glass” means a glass produced by subjecting annealed glass to a process of heating and rapid cooling which produces high compression in the surface and compensating tension in the interior;

“trained plumber” means any person who in the trade of plumbing has, in terms of the Manpower Training Act, 1981 (Act No. 56 of 1981), passed a qualifying trade test or has been issued with a certificate of proficiency, or has obtained a National Certificate in Construction Plumbing, National Qualification Framework Level 3;

“trap” means a pipe fitting or a part of a sanitary fixture which is designed to retain a water seal;

“trap vent” means a ventilating pipe connecting an individual trap to the open air or to another ventilating pipe;

“travel distance” means –

(a) the distance, in any building where emergency routes are required, from the furthest point in any room in such building to an access door; or

(b) where no emergency routes are required, the distance from the furthest point in any room in a building to an escape door;

“tread” means the upper surface of a step;

“two-pipe system” means a system of piping between sanitary fixtures and a drain in which waste water and soil water discharge through separate discharge pipes and in which any trap venting or other venting that is required is via separate ventilating pipes for the waste and soil water systems;

U

“unit fire load” means the fire load of a compartment or division divided by the floor area of such compartment or division, and is expressed either as timber equivalent (kg/sq m) or heat energy value per sq m (MJ/sq m);

“unprotected steel” means structural steel which is not protected with fire resistant material against the effect of fire;

V

“vent” means a ventilating pipe;

“ventilating pipe” means a pipe which leads to the open air at its highest point and which provides ventilation throughout a drainage installation for the purpose of preventing the destruction of water seals, but does not include a discharge pipe;

“vent stack” means a main vertical ventilating pipe of any part of a drainage installation;

“vent valve” means a one-way air valve specifically designed and constructed to be fitted near the crown of the trap serving a waste fixture to protect the water seal of such trap against excessive negative air pressure arising in the fixture discharge pipe;

“vertical” in relation to a discharge pipe or ventilating pipe, means inclined at 45° or more to the horizontal, and in relation to a glass pane means installed at any angle between 60° and 90° to the horizontal, both figures being inclusive;

W

“waste branch” means a branch discharge pipe which conveys waste water only;

“waste fixture” means a sanitary fixture from which waste water is discharged;

“waste pipe” means a discharge pipe which conveys waste water only;

“waste water” means used water not contaminated by soil water or industrial effluent and shall not include stormwater;

“water fitting” means any component, other than a pipe, of any water installation, through which water passes or in which it is stored;

“water installation” means an installation used or intended to be used for the conveyance or storage of water in any building or on any site on which such building is situated and includes any pipe or any water fitting other than any water meter vested in the local authority;

“water seal” means the water in a trap which acts as a barrier against the flow of any foul air or gas;

“water supply system” means any system of structures, aqueducts, pipes, valves, pumps, meters or other appurtenances relating thereto which are vested in the local authority and are used or intended to be used by it in connection with the supply of water;

“wind load” means the force exerted by the action of wind;

“winder” means any tapered tread that has a minimum going of less than 50 mm and which is used in conjunction with non-tapered treads in a single flight;

“wired glass” means annealed glass containing a wire mesh which is completely embedded in the body of the glass during manufacture;

Z

“zone of space” in relation to an opening in an external wall or a portion of such an opening, means a volume of open air outside such opening.