Reinforce Roof With Trusses And Rafter Ties

High enough to give room to nail the mid span cross tie at the desired location.

Reinforce roof with trusses and rafter ties.

Ceiling joists can serve as rafter ties when they are running the same direction as the rafters and are properly tied tied together with them at the exterior wall. Usually trusses are put 24 inches apart. Reinforce your roof a properly constructed roof in areas subject to high winds has trusses attached to walls with hurricane tiedowns properly nailed sheathing and heavy duty shingles. Hurricane ties offer a strong connection that will provide you with the strongest resistance against uplift.

A lack of rafter ties is a serious structural issue in a conventionally framed roof. As the rafter tie is raised it puts a bending load on the rafter at the point of connection the rafter needs to be deeper as the tie is raised. With the roof rafter pair straightened clamp new mid span cross ties in place and then nail the tie ends to the rafters. Consult your local code officials for details.

Some of these can support the roof and prevent ridge sagging and wall spreading. Notice the rafter spreader bolt. When the ceiling joists are running perpendicular with the rafters then rafter ties are run above the joists in the direction of the rafters and are fastened to them. It can be nailed temporarily to each truss as the next truss is put in place.

The ceiling joists create a truss to begin with i m suggesting adding another member to the truss. Instead of attaching the tie to the rafter you will be attaching it to the bottom chord of the truss. Collar ties rafter ties tension beams structural ridge beams. This is a picture of another way of framing a roof a heavy timber truss at very wide spacing.

Tie to roof rafters at peak tie to ceiling joists roof rafters to ceiling joists at the eaves. Installation is the same for trusses as for rafters see above. To hold them up until the decking of the roof is placed on top a 12 foot 1 inch by 4 inch piece of lumber is used. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams.

Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered trusses. These are usually accomplished during a complete re roofing. For hip roofs the code specifies that hip and girder rafters or trusses be connected to exterior wall plates. For gable end roofs the florida code requires that you start by tying down roof framing members within 6 feet of each corner.

In most homes the ceiling joists also serve as the rafter ties.