Every rule your project must meet, found for you.

NI-wide·Technical Booklet N Drainage

The guidance contained in this Technical Booklet relates only to the requirements of regulations 80, 81 and 82. The work will also have to comply with all other relevant requirements of the Building R

NI-wide·Technical Booklet N Drainage

Regulation 82 shall not apply to a drainage system intended for use in connection with a roof or balcony of 6 m2 or less in area, unless that roof or balcony receives a flow of rainwater from another

NI-wide·Technical Booklet N Drainage

"Foul water" means waste from a sanitary appliance and water which has been used for cooking or washing purposes and not contaminated by trade effluent;

NI-wide·Technical Booklet N Drainage

"Rainwater drainage" includes gutters, pipes, drains and fittings which convey rainwater only;

NI-wide·Technical Booklet N Drainage

"Sanitary pipework" means a pipe or system of pipes for conveying foul water from a fitting to an underground foul drain;

NI-wide·Technical Booklet N Drainage

"Underground foul drainage" includes drains and private sewers used in connection with buildings but not a system which is solely for the conveyance of subsurface water.

NI-wide·Technical Booklet N Drainage

Every building shall be provided with such sanitary pipework, underground foul drainage and rainwater drainage as may be necessary for the hygienic and adequate disposal of foul water and rainwater fr

NI-wide·Technical Booklet N Drainage

Sanitary pipework shall— (a) consist of pipes and fittings— (i) of such size, layout, construction and watertightness; and (ii) with sufficient ventilation, to ensure the hygienic conveyance of foul w

NI-wide·Technical Booklet N Drainage

Underground foul drainage shall— (a) consist of pipes and fittings— (i) of such size, layout, construction and watertightness; and (ii) with sufficient ventilation, to ensure the hygienic conveyance o

NI-wide·Technical Booklet N Drainage

Rainwater drainage shall— (a) consist of pipes and fittings— (i) of such size, layout, construction and watertightness; and (ii) with sufficient ventilation, to ensure the hygienic conveyance of rainw

NI-wide·Technical Booklet N Drainage

Any cesspool, septic tank or similar structure shall be— (a) so constructed as to be impervious to both liquid from the inside and subsoil water from the outside; and (b) so sited— (i) as not to rende

NI-wide·Technical Booklet N Drainage

A cesspool shall be— (a) of suitable depth to enable it to be emptied completely; (b) properly covered so as to be impervious to surface water and rainwater; (c) fitted with a suitable manhole cover f

NI-wide·Technical Booklet N Drainage

Any structure to which paragraph (1) applies other than a cesspool shall be— (a) of suitable depth; (b) of adequate size, having in no case a capacity of less than 2.7 m³; (c) covered or fenced in; (d

NI-wide·Technical Booklet N Drainage

It is the view of the Department that the requirements of regulations 80 and 81 will be met if a foul water drainage system – (a) conveys the flow of foul water to a foul water outfall connected to a

NI-wide·Technical Booklet N Drainage

The guidance in Section 2 covers various aspects of sanitary pipework design including suitable materials, pipe sizing, capacity of pipes, seals and ventilation. Guidance is also given on drainage for

NI-wide·Technical Booklet N Drainage

It is the view of the Department that the requirements of regulation 82 will be met if – (a) rainwater from a building is carried away from the surface by a drainage system; and (b) a rainwater draina

NI-wide·Technical Booklet N Drainage

Section 4 gives guidance on the design of rainwater drainage including suitable materials, the sizing of pipes, gutters and outlets, and the capacity of the system related to the expected flow and the

NI-wide·Technical Booklet N Drainage

Refer to the Part N Regulations, Application and interpretation, for the definitions which apply in this Technical Booklet.

NI-wide·Technical Booklet N Drainage

The provisions in this Technical Booklet are applicable primarily to domestic buildings and small non-domestic buildings. For larger or more complex systems seek specialist advice.

NI-wide·Technical Booklet N Drainage

The guidance in this Technical Booklet is applicable for WCs with major flush volumes. Consideration should be given to the increased risk of blockages when using WCs with low flush volumes.

NI-wide·Technical Booklet N Drainage

Laying and maintaining drains are hazardous operations. Appropriate safety codes should be followed including procedures for working in confined spaces. Safe working procedures and permits may be requ

NI-wide·Technical Booklet N Drainage

The materials for sanitary pipework should be in accordance with the relevant standard given in Table 2.1. Where different metals are used they should be separated by non-metallic material to prevent

NI-wide·Technical Booklet N Drainage

The capacity of a sanitary pipework system should be adequate to carry the expected flow at any point, provided that where a minimum size of pipe is stated in a paragraph, Table or Diagram that size o

NI-wide·Technical Booklet N Drainage

Material Relevant standard Pipes: Cast iron BS 416, BS EN 877 Copper BS EN 1254 Galvanised steel BS EN 1057 uPVC BS 3868 Polypropylene BS 4514, BS EN 1329 Other plastic BS EN 1451 BS EN 1329, BS EN 14

NI-wide·Technical Booklet N Drainage

Appliance Flow rate (litres/sec) WC (9 litre cistern) 2.30 Washbasin 0.60 Spray tap basin 0.06 Sink 0.90 Bath 1.10 Shower 0.10 Automatic washing machine 0.70 Urinal (per person unit) 0.15

NI-wide·Technical Booklet N Drainage

All points of discharge into a system should be fitted with a water seal (trap) to prevent air from the system entering the building. The minimum size of trap and depth of seal for an appliance should

NI-wide·Technical Booklet N Drainage

The system should be capable of withstanding an air or smoke test of a positive pressure of 38 mm on a water gauge for at least 3 minutes, and every trap should maintain a water seal of at least 25 mm

NI-wide·Technical Booklet N Drainage

If a trap forms part of an appliance the appliance should be removable. All other traps should be fitted directly after the appliance and should be removable or be fitted with a cleaning eye.

NI-wide·Technical Booklet N Drainage

To prevent the water seal from being broken by the pressures which may develop in the system a branch pipe should either be ventilated as described in paragraph 2.11 or constructed as described in par

NI-wide·Technical Booklet N Drainage

Appliances: Washbasin, Bidet - Diameter of trap (mm): 32, Depth of seal (mm): 75(1); Sink, Bath, Shower, Food waste disposal unit, Urinal bowl - Diameter of trap (mm): 40, Depth of seal (mm): 75(1); W

NI-wide·Technical Booklet N Drainage

Where an overflow pipe discharges to a branch pipe or a stack it should do so through a trap. In all other cases an overflow pipe should discharge in a visible location and should not cause dampness i

NI-wide·Technical Booklet N Drainage

A branch pipe should be at least the same diameter as the appliance trap and where it serves more than one appliance and is unvented, it should be of at least the diameter and gradient given in Table

NI-wide·Technical Booklet N Drainage

The branch pipe from an appliance on a storey above the ground storey should discharge into another branch pipe or a discharge stack. An appliance on the ground storey may discharge into another branc

NI-wide·Technical Booklet N Drainage

Common branch discharge pipes (unvented) Appliance | Max number to be connected | Max length of branch (m) | Min size of pipe (mm) | Gradient limits (fall per metre) min (mm) | max (mm) WCs | 8 | 15

NI-wide·Technical Booklet N Drainage

Rodding points should be provided to give access to any length of branch pipe which cannot be reached by removing a trap.

NI-wide·Technical Booklet N Drainage

Direct connections of ground floor WC to a drain. A 50 mm diameter parallel branch should be used where a branch pipe would enter the stack within 200 mm below a WC connection. Smaller similar sized o

NI-wide·Technical Booklet N Drainage

Branch connections to stacks. Minimum height (H) requirements: houses up to 3 storeys 450 mm; any building up to 5 storeys 750 mm; any building up to 20 storeys 1 storey; any building over 20 storeys

NI-wide·Technical Booklet N Drainage

Subject to paragraph 2.12 a branch ventilating pipe should be connected to a branch pipe within 300 mm of the trap (see Diagram 2.4) and should be not less than 25 mm diameter or, where the length of

NI-wide·Technical Booklet N Drainage

A branch ventilating pipe should not be required if the length and slope of a branch pipe does not exceed the maximum dimensions and gradients for the relevant pipe diameters given in Diagram 2.5.

NI-wide·Technical Booklet N Drainage

A ventilation stack should provide ventilation to branch ventilation pipes and may also provide ventilation to underground foul drainage (see paragraph 3.5). The lower end of a ventilation stack may b

NI-wide·Technical Booklet N Drainage

The upper end of a ventilation stack should terminate in the external air at least 900 mm above any opening into a building within 3 m, with a cage or cover which does not restrict the air flow (see D

NI-wide·Technical Booklet N Drainage

The upper end of a ventilation stack should terminate with an air admittance valve which complies with BS EN 12056: Part 2 and BS EN 12380.

NI-wide·Technical Booklet N Drainage

The upper end of a ventilation stack should connect to a ventilated discharge stack above the "spillover" level of the highest appliance served.

NI-wide·Technical Booklet N Drainage

Where the larger branch pipe size is used and the diameter of the trap is not increased the tail of the trap should be lengthened by 50 mm before increasing the diameter

NI-wide·Technical Booklet N Drainage

Unvented branch connections to stacks - WC: slope 18 mm/m (min), 6.0 m (max) for single WC; Washbasin: see para 2.12; Sink: slope 18 mm/m (min), 3.0 m (max) for 40 mm pipe, 4.0 m (max) for 50 mm pipe;

NI-wide·Technical Booklet N Drainage

Design curve for 32 mm washbasin wastes - graph showing gradient (mm per m length) on y-axis from 0 to 120, and length of branch (m) on x-axis from 0.5 to 1.75 m.

NI-wide·Technical Booklet N Drainage

A stack should discharge into a drain and be of at least the internal diameter given in Table 2.5. The diameter of a stack should not reduce in the direction of flow, nor have an offset in any part ca

NI-wide·Technical Booklet N Drainage

A discharge stack (other than a stub stack complying with paragraph 2.16) should be ventilated. The diameter of the part of a stack above the highest branch pipe may be reduced to 75 mm where the stac

NI-wide·Technical Booklet N Drainage

A stub stack may be unvented if it connects to a ventilated discharge stack or drain and is not more than 6 m from the discharge stack or drain. No branch pipe should discharge into a stub stack at a

NI-wide·Technical Booklet N Drainage

Table 2.5 Minimum diameter for discharge stacks Peak flow rate (litres/sec) | Min diameter (mm) 1.2 | 50(1) 2.1 | 65(1) 3.4(2) | 75 5.3 | 90 7.2 | 100 Notes: (1) No WCs. (2) Not more than 1 siphonic