Flat Roof Assembly Detail

Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs.

Flat roof assembly detail. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. That will help you remember certain factors and details to build the best possible flat roof. Flat roofs are hard to replace.

This could mean flat roofs may not raise the same red flags they used to. 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. In unvented flat or low slope roofs with parapets perform a full flood test to ensure leak free installation of roofing membrane. 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.

The perimeter of the roof assembly insulation is wrapped to prevent interstitial airflow from the parapet into the multilayered. The goal of this article is to help building owners architects and contractors decide which commercial roofing options are right for each unique project. Test roofing membranes for integrity prior to covering from below. Roof assemblies must control for exterior moisture in a monolithic and complete fashion.

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. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

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. Heat welded seams provide superior strength. 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.