Single Ply Membrane Roof Minimum Fall

Ponding water will not have any detrimental affect on the monarplan pvc single ply roofing membrane however it is recommended that roofs be designed with falls minimum 1 80 to remove water from the roof.

Single ply membrane roof minimum fall.

Our technical department can design bespoke insulation schemes for individual projects and provide advice on roof fall design. It is recommended never to design a roof that is completely flat. We also cover spray applied foam and liquid roofing options. Our membranes are manufactured in our state of the art production facility in chesterfield which has bs en iso 9001 bs en iso 14001 and bes 6001 accreditations.

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. However both the british standards and sig advise falls of 1 40 to take account of constructional inaccuracies potential roof deflection and different types of roofing material. 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. 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.

Bs6229 states that the minimum finished fall of single ply membranes at any point should be 1 80. Falls with regards to falls bs 6229 2003 recommends a minimum of 1 80 achieved falls for single ply membranes at any given point along the roof. Sika sarnafil watchmead welwyn garden city al7 1bq 01707 394 444. Single ply roofing is priced per square foot and an average price for materials and installation of a 60 mil roof may range from 3 to 5 per square foot.

The recommended minimum fall for a flat roof is 1 80 0 72. It is accepted good practice to design in a fall or slight gradient of at least 1 60 which equates to 17mm over 1m. The cost associated with the material and installation can vary widely depending on roof conditions the attachment used and the type of membrane being installed. Membrane roofing is often used on commercial flat roofs.

Common flat roof membranes discussed in this article include built up asphalt tar and gravel modified bitumen and single ply membranes like epdm pvc tpo and kee.