Hip Roof Valley Framing

This slope and skew calculator makes it easy by performing all of the necessary trigonometry for each hanger condition in the roof.

Hip roof valley framing.

Now outline the biggest rectangle inside the building layout. Hip rafter ratio length multiplier hrrlm 18 12 1 5 common rafter length multiplier crlm 13 4164 12 1 11803. Place the 4 6 common rafters in their designated positions along the 2 longest walls and nail them firmly to the wall with a nail gun. Divide the rafter length by 12 of run to calculate the roof ratio multiplier.

Hip and valley roof framing is no so complex as compared to hip roof framing procedures. Thus there are hip jack rafters and valley jack rafters. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. Determining the slope and skew angles related to hip and valley beams can be a challenge made even more difficult when the roof slopes on each side if the hip or valley are different.

The first step in the process of erecting the hip roof is to get the ridge beam into place at the top of the roof. The total rise of hip and valley rafters is. Here roofs are constructed with an angle of 90 degrees. However since there is some load transfer with these members the code requires a nominal 2 thickness and bracing to a load bearing partition at the upper end or to be designed as a beam with proper supports.

If the wall plates are all square of equal lengths then the hipped rafters would form a pyramid shape like the picture above normally a roof is rectangle and there are more yellow common rafters. Now draw the centerlines for all rectangles that are formed inside. Roof framing geometry kernel rafter lengths roof ratio multiplier. Hip rafters are the diagonal rafters that span from the ridge at the top down to the corners of the roof.

The common rafter length can be calculated by the roof ratio length per 12 of run. First of all you need to design the layout of building. A jack rafter is a shortened com mon rafter that may be framed to a hip rafter a valley rafter or both. Similarly hip and valley rafters provide the point of connection for roof rafters framed at angles.

Rafter is called for only when framing a hip roof but a valley rafter is needed on both hip and gable roofs whenever roof planes intersect. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing.