Flat Roof Assembly Detail

The colder the climate the thicker the rigid insulation required.

Flat roof assembly detail.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Flat roofs are hard to replace. 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.

Having a manual for warm flat roof construction with details and a summary of rules to follow helps. The goal of this article is to help building owners architects and contractors decide which commercial roofing options are right for each unique project. Condensing surface temperature controlled the thickness of the rigid insulation at both the roof deck and perimeter is determined by a calculation procedure similar to figure 5. 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.

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. Pvc membranes are easy to maintain and repair. Heat welded seams provide superior strength.

The higher the interior moisture level the thicker the. The perimeter of the roof assembly insulation is wrapped to prevent interstitial airflow from the parapet into the multilayered. This could mean flat roofs may not raise the same red flags they used to. Download free high quality cad drawings blocks and details of roof and deck insulation organized by masterformat.

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. That will help you remember certain factors and details to build the best possible flat roof. 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. Short for thermoplastic polyolefin tpo is a single ply roofing membrane that offers excellent performance at a cost effective price.

Unvented flat roof assembly.