Hip Roof Valley Framing

Hip rafter ratio length multiplier hrrlm 18 12 1 5 common rafter length multiplier crlm 13 4164 12 1 11803.

Hip roof valley framing.

At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. The common rafter length can be calculated by the roof ratio length per 12 of run. 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. Http amzn to 2sfscbz swanson speed square http amzn to 2svgnvt 16 x 24 framing square starrett http amzn to 2sflm5v milwaukee circular saw http amzn.

First of all you need to design the layout of building. Now outline the biggest rectangle inside the building layout. Here roofs are constructed with an angle of 90 degrees. Similarly hip and valley rafters provide the point of connection for roof rafters framed at angles.

Divide the rafter length by 12 of run to calculate the roof ratio multiplier. Roof framing geometry kernel rafter lengths roof ratio multiplier. The total rise of hip and valley rafters is. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition.

Now draw the centerlines for all rectangles that are formed inside. 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. Hip and valley roof framing is no so complex as compared to hip roof framing procedures. 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.

Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. A jack rafter is a shortened com mon rafter that may be framed to a hip rafter a valley rafter or both. Attach 4 6 centering rafters and lift the ridge beam into place. 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.

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