Flat Roof Framing Plan Details

Some roofs actually slope in several directions ensuring optimal water runoff.

Flat roof framing plan details.

As you can see the initial plan for framing your roof needs to take into account several key variables such as the shape of the roof and any relevant community building codes. Parts of a roof. Above all the major benefit is being simple in construction process. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

Transfers the loadof the roof through the raftersto walls below. Ridge board ridge beam. Position the square at the end of the rafter board with the tongue on your left and facing away from you. The point at which all the raftersare attached to.

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. 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. Ridge beam sits below the rafters. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. 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. From there the flat roof system you choose will determine the materials you apply. Of course you don t need to live in a modern house to deal with a flat roof.

Get along with the benefits of flat roof design. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. When framing a flat roof you will need to create a slight incline. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge.

The construction of the flat roof is similar to that of the timber upper floor. Details for conventional wood frame construction the first approach to achieving a strong durable struc ture involving economical use of materials is to follow a. You can do this with a foam layer that exactly fits your roof. This will help you create a flat roof framing plan.

Flat roofs are always built at a slight incline at least 1 8 inch per foot. Ridge board v s beam. Add the length of the overhang beyond this mark and. They focus on the importance of flat roof which is their selling theme.

A ridge board is a horizontal member of the roof frame. You will then have to choose between two very different types of roof framing stick framing vs.