Flat Roof Fall Building Regs

It is a requirement of building regulation part h that adequate provision is made for rainwater to be carried from the roof of the building.

Flat roof fall building regs. The building regulations for flat roofs can seem like a lot to understand which is why we have put together a simple guide of the things you need to know about when it comes to considering the building regulations for flat roofs. Because the desired fall may be difficult to achieve in practice the designer may need to adopt a design fall considerably steeper often twice than the recommended finished fall. There must be a slope of 1 80. When installing or repairing a flat roof you must adhere to building regulations.

Occasionally a new flat roof will be required to replace an old roof for example asbestos or corrugated tin roofs which are either not allowed under building regulations or are in a complete state of disrepair. In bs 6229 a roof is defined as flat if it has an overall pitch of 10 degrees or less. According to bs 6229 bs 8217 flat roofs should be designed with minimum falls of 1 40 to ensure a finished fall of 1 80 can be achieved allowing for any inaccuracies in the construction. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines.

The fall should never be less than 1 80 and preferably about 1 40. The building regulations encourage a minimum fall of 1 40 i e. 40 units in length for every one unit drop in height although the minimum fall required according to bs 6229 a british standard for flat roofs is a shallower 1 80. Protecting roofing workers 5.

There are several methods of building in a fall. There is also the scope to incorporate a green roof onto the flat structure. If flat roofs are to work well they have to have a slope known as a fall to shed rainwater. Part h of the building regulations regarding drainage state that water should drain to one or two edges.

Cover photo courtesy of the national roofing contractors association. The building regulations encourage a minimum fall of 1 40. How are flat roofs defined. With regard to fall protection requirements applicable to the construction work itself 1926 501 b 10 low slope roofs requires conventional fall protection a combination of a monitoring system and warning line or on roofs of 50 feet or less in width a monitoring system alone i e without a warning line be used.

What pitch is a flat roof. Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.