General requirements

0638 UPVC Down pipes, gutters and strainers

Comply with the requirement of UPVC products in the Sanitary Installation section this Specification.

064 EXECUTION
0641 GENERAL

Fixing of cladding shall be fully water tight and performed to the best standard of the trade.

Roofing & other cladding shall be constructed with sufficient slope or camber to ensure adequate drainage including the avoidance of possible ponding of water Due to deflection.
Roofing and other cladding shall be fixed to fully resist up-lifting and overturning.
Fixing hole on cladding shall be drilled in crown. Holes shall be 5mm larger in diameter then bolts and hooks and located not less than 40mm from the edges of sheets.
The erection and fixing of cladding and accessories shall generally be in accordance with the material manufacturers recommendation and the detailed drawings.
No person other than workmen fixing cladding shall have access to the area while roofing is under construction.
Access to fiber reinforced tile roofs such as roof-boards shall be provided and at no times shall a person be allowed on the roof without the use of such walkways, roof-boards, cut-ladder or crawling boards.
Notices warning workmen not to step on to the fiber reinforced roof tile shall be provided in conspicuous positions on the walkway and at all usual points of access to the roof.

Sufficient over hang or other means shall be produced as weather protection for walls susceptible to dampness penetration.

Cladding shall be laid with upper laps away from prevailing wind.
0642 LAYING

Galvanized steel corrugated & ribbed sheets and aluminum corrugated sheets for roofing shall be laid with end laps not less than 150mm and side laps not less than one and half corrugations.

Vertical cladding sheets shall be laid with end laps not less than 100mm and side laps not less than one corrugation.
Corrugated asbestos sheets shall be laid with end laps not less than 200mm and side laps of one corrugation minimum.
Ridges, flashing, etc to asbestos roofing shall be filled with mastic or sand and bitumen mix to ensure that the joints are water tight.
Roofing & cladding and accessories shall be securely fastened to the structure as recommended by the manufacturer or, as details on drawings in the materials specified in section 06243 of this Specification.