How To Construct A Valley On A Pitched Roof

Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings.

How to construct a valley on a pitched roof.

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. 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. Soup to nuts riley shows the proper way of installing a valley on a roof.

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. The blind valley roof can be used to calculate valleys for roofs with unequal slopes. This type of construction involves the use of factory made frames called tresses each of these trusses includes combining the joist. Of run for the valley rafter to rise the same distance that the common rafters rise in 12 in.

Part 3 of the four part guide to roof construction covers pitched roof detail. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Unlike the cut roof method this method does not have a carpenter onsite creating pieces to be placed together on a roof. This gives the angle of the hip rafter.

The run of the valley rafter is longer than the run of the common rafters so it takes 17 in. The hip and valley factor varies according to the slope of the roof as shown in the table below. Divide the rise by the run the run is 12. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

To get the most out of it is helpful to also read parts 1 and 2. Therefore the pitch of the valley rafter is 12 in 17. 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. 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.

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