How To Construct A Valley On A Pitched Roof

Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

How to construct a valley on a pitched roof.

The run of the valley rafter is longer than the run of the common rafters so it takes 17 in. Therefore the pitch of the valley rafter is 12 in 17. The hip and valley factor varies according to the slope of the roof as shown in the table below. This type of construction involves the use of factory made frames called tresses each of these trusses includes combining the joist.

For any roof slope expressed as x in 12 rise in run the hip and valley factor is determined by finding the square root of rise run 2. Use a sturdy extension ladder that extends at least 3 feet above the eaves to climb onto the roof and secure the bottom to the foundation and the top to the eaves or fascia so it doesn t move. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. The blind valley roof can be used to calculate valleys for roofs with unequal slopes.

Another pitched roof construction manner is the truss roof method. This gives the angle of the hip rafter. Soup to nuts riley shows the proper way of installing a valley on a roof. 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.

Unlike the cut roof method this method does not have a carpenter onsite creating pieces to be placed together on a roof. Divide the rise by the run the run is 12. To get the most out of it is helpful to also read parts 1 and 2. Of run for the valley rafter to rise the same distance that the common rafters rise in 12 in.

How to tie a additions roof to existing roof roof additions to existing roofs how to construct a roof from an exsisting shead how to change a roof line how to attach a deck roof to existing roof how to add a roof over porch attache porch roof on house attach shed roof to house adding a roof to screened in porch adding a roof to existing. The heel height overhang and ridge and fascia boards for both roofs will be the same. Part 3 of the four part guide to roof construction covers pitched roof detail. Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings.

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. Unit run of the hip.