Frame Roof Valley

The rise or height of the roof at its peak is the altitude of the triangle.

Frame roof valley. Valley roof a valley is a roof design that creates a v shape. By rick arnold issue 161. And the line length measurement from the roof peak to the building wall is the hypotenuse. 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.

Getting the rafters right. Blind valleys simplify framing. While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side.

Often seen on complex roof shapes. Usually has a metal valley exposed. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. 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.

The roof rafters provide integral structural support to the roof. Framing a roof valley do the math on a calculator so that you can concentrate on what s important. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. 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. The point at which all the rafters are. The run or half the building span is the base of the triangle.