Single Ply Flat Roof Fall

This applies whether the waterproofing is a polymeric single ply membrane a reinforced bitumen membrane or another type listed in bs 6229 2018 the code of practice for flat roofs with continuously supported flexible waterproof coverings.

Single ply flat roof fall.

The use of single ply waterproof membranes in the construction of flat roofs requires knowledge of different roof constructions and a familiarity with the different membrane types. Single ply roofing systems are one of the most popular of flat roofing materials particularly advantageous if the project has weight and load bearing considerations. The recommended minimum fall for a flat roof is 1 80 0 72. There are two types of flat roof.

Tapered insulation systems are a lightweight convenient and cost effective alternative method of providing falls to the roof and can be used with our reinforced bitumen membrane rbm and synthetic single ply roof systems. Good practice guidance recommends that flat roofs defined as 10º should not be completely flat and should be designed with adequate finished falls to ensure the completed roof drains freely. Technical committee has also confirmed its opposition to the confusion created by the british board of agrément s attempts to define flat roofs zero fall roofs and completely flat roofs. Single ply flat roof drainage best practice best practice dictates that flat roofs should expel rainwater quickly and effectively.

What is single ply roofing. Sika sarnafil watchmead welwyn garden city al7 1bq 01707 394 444. Stephen cleminson and daniel bosworth technical director and design manager at sig design technology explore the importance of adequately designed falls and drainage in achieving this. The reasons for falls are well documented in the bs spra design guide nhbc standards premier guarantee technical standards and so on.

Single ply roofing has become an increasingly popular flat roof covering over the last few years. As the single ply roofing association spra points out this type of flat roofing is strong durable completely sealed and usually lasts at least 25 30 years. The membrane is durable and resistant to european climate conditions tears and punctures yet incredibly lightweight typically 2 3kg per square metre.