Detail Flat Roof Joist Construction

It is for that reason that the flat roof construction manual focuses on the subject of designing energy saving flat roofs free from damage.

Detail flat roof joist construction. Flat roof joist calculator. A waterproof exterior layer is essential and there are a number of options including bitumen based felt or asphalt epdm rubber and pvc based systems as well as cold applied liquid systems bitumen coverings. Flat roof with asphalt finish with felt boarding insulation. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure.

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. It dealt in detail with flat roof constructions and. This demo version is fixed at 1m clear span. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes.

This will give additional stability to the roof structure. Good installation begins with specification of the correct joist for the application. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. From there the flat roof system you choose will determine the materials you apply.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Of course you don t need to live in a modern house to deal with a flat roof. For additional stability you can also use steel joists that are built into one or both of the walls. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board.

On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. Flat roof construction for residential a roof is considered to be flat when it is of a slope of 1 5o to the horizontal. The full version allows any size. I joist construction details.

I joists in floor and roof applications. Other flat roof construction details often refer to the types of flat roof coverings. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. The starting point involves laying roofing joists across the two upright items which in most cases will be the walls of the structure.