Frame Roof Valley

Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.

Frame roof valley.

The roof rafters provide integral structural support to the roof. 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 re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters. 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.

And the line length measurement from the roof peak to the building wall is the hypotenuse. Often seen on complex roof shapes. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side. By rick arnold issue 161.

Framing a roof is the last step in framing new construction. 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. 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. Framing a roof valley do the math on a calculator so that you can concentrate on what s important.

The run or half the building span is the base of the triangle. Getting the rafters right. Parts of a roof a ridge board is a horizontal member of the roof frame. The rise or height of the roof at its peak is the altitude of the triangle.

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. The point at which all the rafters are.