Framing Level Box Style Roof

The roof framing must also function as part of the roof diaphragm to transfer lateral loads to the shear walls below.

Framing level box style roof.

Rather than a single slope a gable roof consists of two slopes that meet at a peak running down the middle of the roof. Position the square at the end of the rafter board with the tongue on your left and facing away from you. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. When matched to the angle and proportions of other rooflines on the house your gable roof will add visual interest and character to the home making the addition look like an asset that belongs with the house.

The roof is held up by walls or posts where one wall or the posts on one side are at a higher level than those on the opposite side. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. A half hipped roof is almost identical to a simple hip roof design but instead the two sides of the roof are shortened creating eaves at the either side of the house. The roof framing must support the roof decking and sheathing and resist loads applied to the sheathing and transfer loads vertically to support walls or frames.

Design criteria and specifications. It is a complex framing style that can be or usually is a variation of the hip roof but a gable home may also make use of bonnet frame. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

Next use these calculations to determine how many rafters you ll need for your roof and cut them to size. To frame a roof start by choosing a roof style like a frame or gabled. As pictured above it is likely to extend much further than a mansard besides having the lower pitched slope on the bottom. Common or box allowable shear plf anchor bolts 12 long or 15 for 2 pour upper floor sill.

The shed roof or lean to is a roof having only one slope or pitch. Roof diaphragm design shearwall design continuous footing design. Add the length of the overhang beyond this mark and. Roof framing 3 5 psf 1 2 drywall ceiling 2 0 psf insulation 2 0 psf d l 19 psf.

Then gather your measurements by calculating the run rise and length of each rafter segment in feet and the pitch of your roof in inches. It is used where large buildings are framed under one roof where hasty or temporary construction is needed and where sheds or additions are erected.