Flat Roof Assembly Detail

That will help you remember certain factors and details to build the best possible flat roof.

Flat roof assembly detail.

In unvented flat or low slope roofs with parapets perform a full flood test to ensure leak free installation of roofing membrane. Short for thermoplastic polyolefin tpo is a single ply roofing membrane that offers excellent performance at a cost effective price. Download free high quality cad drawings blocks and details of roof and deck insulation organized by masterformat. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot.

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Today s variety of flat or low slope commercial roofing options roof pitches ranging from 12 to 3 12 is no longer simple and has grown considerably in the last 50 years. Tpo s long term heat uv and natural fungal resistance plus flexibility without need for plasticizers also make tpo a reliable low slope roofing system. The roof membrane is fully adhered to a coverboard that is mechanically attached to the structural deck in the field of the roof and an allowance for membrane movement is provided at the perimeter of the roof assembly.

The perimeter of the roof assembly insulation is wrapped to prevent interstitial airflow from the parapet into the multilayered. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. Before constructing a flat roof assembly please refer to the unvented roof assembly comments under 6 2 vented and unvented roof assemblies and if applicable 6 3 parapet walls. Roof assemblies must control for exterior moisture in a monolithic and complete fashion.

This could mean flat roofs may not raise the same red flags they used to. This is how to detail an unvented roof assembly for flat and low slope roofs. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. The goal of this article is to help building owners architects and contractors decide which commercial roofing options are right for each unique project.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Test roofing membranes for integrity prior to covering from below. Heat welded seams provide superior strength.