Wood Flat Roof Framing Details

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.

Wood flat roof framing details. Flat roofs are always built at a slight incline at least 1 8 inch per foot. This is known as prescriptive framing. The run or half the building span is the base of the triangle. And the line length measurement from the roof peak to the building wall is the hypotenuse.

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. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. Block double top plate wall section. Conventional light frame wood structures may be built without the need for engineering analysis of each component.

Of course you don t need to live in a modern house to deal with a flat roof. This will help you create a flat roof framing plan. Slab on grade construction where stucco is applied over sheathing provide 2 layers grade d paper under lath n 2x4 stud wall 16 oc df stud grade. Within limitations which include among others building size roof.

This could mean flat roofs may not raise the same red flags they used to. The rise or height of the roof at its peak is the altitude of the triangle. Chapter 7 ceiling and roof framing 40 ceiling joists 40 flush ceiling framing 42 post and beam framing 42 roof slopes 44 flat roofs 45 pitched roofs 45 valleys 48 dormers 48 overhangs 48 ridge beam roof details 49 lightweight wood roof trusses 49 chapter 8 wall sheathing 53 types of sheathing 53 corner bracing 54. Flat roofs are hard to replace.

When framing a flat roof you will need to create a slight incline. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs. The focus of this project was on connections used with conventional light frame wood roof construction.

The provisions for prescriptive roof construction are found in chapter 8 of the irc and in section 2308 of the ibc. The details were adapted from figures in the apa publication the advanced framing construction guide form m400 which highlights construction. 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. 2x ceiling joists 2x solid blocking w approved framing anchor ea.

You can do this with a foam layer that exactly fits your roof.