Framing Roof Valley Rafters

The total rise of hip and valley rafters is.

Framing roof valley rafters.

To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. On the common rafters the plumb cut is marked with a framing square for a 12 in 12 pitch 45 and cut square i e no bevel. A jack rafter is a shortened com mon rafter that may be framed to a hip rafter a valley rafter or both. Thus there are hip jack rafters and valley jack rafters.

After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side. This article will discuss a gable roof without valleys or dormers because it s the most common and the easiest for a first time builder to tackle. 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. Therefore the pitch of the valley rafter is 12 in 17.

After you determine the rise span run line length and pitch the next step is to lay out the rafters or mark the cuts on a pattern rafter to create the roof. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. Blind valleys simplify framing. The roof rafters provide integral structural support to the roof.

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