How To Build A Valley Roof

Framing a complex roof is one of the trickiest parts of home building.

How to build a valley roof.

The rise or height of the roof at its peak is the altitude of the triangle. Purchase the straightest board that you can. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Use a straight 2 in 6 in 5 1 cm 15 2 cm board for your ridge board.

This roof valley is a perfect example. This gives the angle of the hip rafter. Unit run of the hip. To secure the roof valley flashing nail it down carefully.

And the line length measurement from the roof peak to the building wall is the hypotenuse. Draw a diagonal line between 9 feet the run of the main roof on the tongue of the square and 7 feet 6 inches the secondary roof run on the blade. The run or half the building span is the base of the triangle. How to do a roof valley martin s roofing and guttering merton ltd for all your roofing needs.

Ensure ice and water protector has been installed along the valley first. But it doesn t have to be. 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. Only nail at the edges with only enough nails to.

To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Then starting at the base of the. It installs and looks almost the same as a regular cut valley where the shingles on the low volume roof plane are installed first and pass through the center of the valley by at least 12 in. Put rafters in the.

Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. Line up the top of the ridge board between the. In a hip roof with equal pitches the unit run of a hip or valley rafter is 17 inches for every 12 inches of run in the main roof. Secure the end rafters to the ridge board using 8 penny nails.

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