Gable And Valley Roof Framing

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

Gable and valley roof framing.

Roof framing is the last major framing activity in the construction of a house. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side. A no math approach to valley plates. The run or half the building span is the base of the triangle.

Intersecting the intersecting roof consists of a gable and valley or hip and valley. Roof pitch the roof pitch is the numerical measure of how steep or shallow a roof is. Shed or lean to roof gambrel roof mansard roof dutch hip roof hip roof hip valley roof low slope flat roof gable roof gable roof dormer gable valley roof gable roof with shed roof addition roof styles which roof. Valley rafters and valley jacks.

The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off. After they re up you can snap a line to mark and trim the tails in a nice straight line to make up for any ridge warp or marking cutting and fixing errors. Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet. But it doesn t have to be.

These hip rafters run at a 45 angle from each corner of the building to the ridge. And the line length measurement from the roof peak to the building wall is the hypotenuse. 4 12 through 9 12 are the most common pitches. A disadvantage of the hip roof is that it is more difficult to construct than a gable roof.

The valley is formed where. The diagonal rafter that runs from the intersection of the ridges down to. Blind valleys simplify framing. Vertical rise over horizontal run.

In the u s it is defined by the rise in inches to a 12 run. This roof valley is a perfect example. Chapter 17 reading guide 465. Type of roof because it is braced by four hip rafters.

To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. If you begin with accurate as built measurements and use a construction calculator to do the math you can cut all of the rafters for most roofs on the ground in just one shot. Whether you re tying in new gable dormers or adding a chimney cricket during roof framing giving the valley jacks a place to land is an easy task with these step by step instructions. Gable roof framing calculator plan diagram with full dimensions for a good straight fascia add an extra inch or 2 to the tails of all your rafters total length.

3 inch rise per 12 run is a 3 12 pitch roof.