These are usually accomplished during a complete re roofing.
Reinforce roof with trusses and rafter ties.
For hip roofs the code specifies that hip and girder rafters or trusses be connected to exterior wall plates.
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.
Notice the rafter spreader bolt.
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.
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.
Hurricane ties offer a strong connection that will provide you with the strongest resistance against uplift.
This is a picture of another way of framing a roof a heavy timber truss at very wide spacing.
Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered trusses.
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.
High enough to give room to nail the mid span cross tie at the desired location.
It can be nailed temporarily to each truss as the next truss is put in place.
Collar ties rafter ties tension beams structural ridge beams.
Installation is the same for trusses as for rafters see above.
A lack of rafter ties is a serious structural issue in a conventionally framed roof.
In most homes the ceiling joists also serve as the rafter ties.
This scheme is predicated on achieving serious load carrying connections well thought out and installed a 35 or l clips should to it at all joints.
Tie to roof rafters at peak tie to ceiling joists roof rafters to ceiling joists at the eaves.
Consult your local code officials for details.
When all the trusses are installed and the first row of decking is on this brace is removed.
Some of these can support the roof and prevent ridge sagging and wall spreading.
For gable end roofs the florida code requires that you start by tying down roof framing members within 6 feet of each corner.
Instead of attaching the tie to the rafter you will be attaching it to the bottom chord of the truss.
Usually trusses are put 24 inches apart.
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.
