Flat Roof Rafter Detail

A roof dormer may be gabled as in our sketch above or it may be a low slope or flat roof.

Flat roof rafter detail.

That will help you remember certain factors and details to build the best possible flat roof. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Definition of hip rafter. These days cut ups or roofs with a lot of valleys dormers and other features are increasingly popular.

Such as joist header or rafter. If you build a flat roof try to have it slope in multiple directions to drains or gutters. A rafter that runs diagonally between the roof ridge and the top of the wall plate forming a hipped roof. First off the flat roof design detail is an extremely basic direct and utilitarian design every single current trademark.

A flat roof has a slope of 1 8 per foot to 2 12. It is not ideal for snow or heavy rain but modern materials and proper drainage have helped. Cold roof insulation between rafters wnapor barrier on warm side below orw sheatiiing roofing roofing 2 x 8 sleepers notched for vent aligned wi rafters flashing over rooang fascia sheatiiing 2 x 4 sleepers aligned w rafters provide. Think of a flattened hip roof.

1b apa rim board one. For concentrated vertical load transfer capacity see 1d. Recommended construction details for performance rated i joists in floor and roof applications. The flat roof design detail can go up against different style that when nitty gritty right can ooze a cutting edge feel.

In addition to floor and roof framing details this guide includes recommendations for cantilevers. Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. Another common design in the northeast is the saltbox which is a gable roof with one longer side.

In our rafter type sketch above the hip rafters are drawn in blue. Of course you don t need to live in a modern house to deal with a flat roof. I joist construction details. Main features flat roof design detail.

In many cases with purchased house plans the details of the roof construction including rafter design are included. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.