STUB STACKS
Where a group of appliances or a WC on a ground floor is connected directly to an underground drain, a stub stack of 110mm diameter pipe can be used.

Ventilation is necessary if the distance from the highest appliance connection to the stack to the invert of the drain is in excess of *2m, or if the distance from the crown of the WC connection to the invert of the drain is in excess of 1.5m.

*2.5m max Scotland only



GULLIES
Ground floor washing appliances, producing waste water only, may discharge into a gully: waste pipes from these appliances must terminate between the top of the gully water seal and the level of the gully grid. Several appliances may discharge to the same gully.

WASTE SYSTEM CONNECTIONS
BOSS FITTINGS
Various fittings in the Brett Martin Soil range have integrally moulded bosses which facilitate connection of waste systems - bossed pipes and branches, bossed access pipes, and strap on bosses.The use of these connections is outlined in the installation section on pages

WASTE INLET MANIFOLD
The waste inlet manifold allows up to four appliances to be connected to the soil stack within the 200mm restricted area around the WC connection.The manifold also enables bath and shower connections to be made above floor level where suitable.

WC CONNECTIONS
Connection to most WC units with outlet diameters 82-110mm is effected using the range of adaptors detailed on pages 11-12.They provide sealed socketed fitting to the pan outlet spigot, and multiple sealing in the bore of 110mm pipe and fittings.

UNDERGROUND SYSTEM CONNECTIONS
A soil stack may be connected at ground level to an underground drainage system of PVCu, cast iron or earthenware material. A range of adaptors and couplers is available for these connections.

CLEANING ACCESS
By definition, traps must be removable for cleaning or be fitted with a rodding eye for cleaning access. Where any other section of the system is not accessible for cleaning with the trap removed, suitably positioned rodding eyes should be fitted.

FIRE STOPPING
Where services penetrate separating walls, compartment walls, floors, cavity barriers or protecting elements of a building, there is an obvious potential for fire spread: protection against spread can be provided in several ways.

Requirements for penetrations by any diameter of pipe can be satisfied if it is fitted with a proprietary fire seal device of proven performance, or for any diameter up to 160mm, if it is sleeved for at least 1m on each side of the penetrated element with a non-combustible material. A proprietary fire-stopping material of proven fire resistance can also be used. In the case of internal 160mm PVCu soil stack pipes and 110mm PVCu branch pipes, the pipes must be housed in an enclosure details of which are provided in Building Regulations.

In all cases the appropriate fire protection method used should be agreed with the Local Authority.