Slopped Roof Framing Detail

For our 4 x8 lean to example using a 2 4 rafter the depth of the birdsmouth is limited by the 1 3 depth of the rafter rule.

Slopped roof framing detail.

It is used where large buildings are framed under one roof where hasty or temporary construction is needed and where sheds or additions are erected. Good installation begins with specification of the correct joist for the application. A slope of 6 12 for example means that for every 12 inches 30 cm of length the angle of your roof rises 6 inches 15 cm. The roof is held up by walls or posts where one wall or the posts on one side are at a higher level than those on the opposite side.

Differences associated with roofs having continuous insulation on top of the deck will also be reviewed as will methods for ensuring. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. A 2 4 wall with a 2 6 rafter can be notched for a 4 seat. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. The function of each component is. Venting requirements and detailing approaches to providing appropriate venting paths will be covered for roofs with attic insulation. Rafters act more like the top chord of a roof truss than as a roof joist.

Select an angle of slope away from a house into an area with good drainage and complementary to an existing house or other building. The steeper the slope of your roof the better it will deflect rain sleet snow falling leaves and other materials that find their way on top. And the line length measurement from the roof peak to the building wall is the hypotenuse. On low slope wood frame roofs.

Needed to tie the roof together where the rafters are framed at an angle to each other. On most two story houses you won t have to worry about tying into the roof but you may have to situate the porch carefully to avoid covering a window. The rise or height of the roof at its peak is the altitude of the triangle. Per foot this is called a 5 12 slope and extended 18 in.

Your roof may vary from this and the details of how the porch ties in will vary as well. I joist construction details. Use a framing square to help lay out the notch based on the slope of the roof. I joists in floor and roof applications.

In a rafter roof all of these components are required to provide a stable roof. The house roof sloped 5 in. Measure the outline of the structure to be roofed with a tape measure or get dimensions from a house plan. The run or half the building span is the base of the triangle.