Residential Flat Roof Framing Detail

The focus of this project was on connections used with conventional light frame wood roof construction.

Residential flat roof framing detail.

On two sides the roof abuts a parapet a short wall common around flat roofs as well as a wall for the third floor. Flat roofs are always built at a slight incline at least 1 8 inch per foot. You can do this with a foam layer that exactly fits your roof. Framing must transfer all gravity uplift and lateral loads to the foundation.

Some roofs actually slope in several directions ensuring optimal water runoff. This will help you create a flat roof framing plan. A literature review was conducted and supplemented with new research on the performance of conventional roof systems and components including ceiling joist to rafter connections and roof framing to wall connections. The run or half the building span is the base of the triangle.

To keep water from pooling at these inside corners tom rips 2x4s lengthwise on a 45 degree bevel with a table saw. 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. Typical prescriptive roof framing introduction to prescriptive roof framing 3 prescriptive roof construction the international residential code irc and the international building code ibc set out specific guidelines within which conventional light frame wood structures may be built without the need for engineering analysis of each component. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

In buildings including residential structures framing systems typically consist of the roof structure that supports the roof deck exterior and interior load bearing walls beams girders posts and floor framing. Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. From there the flat roof system you choose will determine the materials you apply.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. The first approach to achieving a strong durable struc ture involving economical use of materials is to follow a basic modular plan for layout and attachment of framing members. Details for conventional wood frame construction. When framing a flat roof you will need to create a slight incline.

The rise or height of the roof at its peak is the altitude of the triangle. And the line length measurement from the roof peak to the building wall is the hypotenuse. Wood construction data 1.