Flat Roof Assembly Detail

Short for thermoplastic polyolefin tpo is a single ply roofing membrane that offers excellent performance at a cost effective price.

Flat roof assembly detail.

Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. 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. This could mean flat roofs may not raise the same red flags they used to. 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.

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. 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. 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.

That will help you remember certain factors and details to build the best possible flat roof. Test roofing membranes for integrity prior to covering from below. The perimeter of the roof assembly insulation is wrapped to prevent interstitial airflow from the parapet into the multilayered. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

The goal of this article is to help building owners architects and contractors decide which commercial roofing options are right for each unique project. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. Flat roofs are hard to replace. Download free high quality cad drawings blocks and details of roof and deck insulation organized by masterformat.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. In unvented flat or low slope roofs with parapets perform a full flood test to ensure leak free installation of roofing membrane. Heat welded seams provide superior strength.