Usually trusses are put 24 inches apart.
Reinforce roof with trusses and rafter ties.
Consult your local code officials for details.
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.
High enough to give room to nail the mid span cross tie at the desired location.
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.
The ceiling joists create a truss to begin with i m suggesting adding another member to the truss.
Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered trusses.
Collar ties rafter ties tension beams structural ridge beams.
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.
Tie to roof rafters at peak tie to ceiling joists roof rafters to ceiling joists at the eaves.
For 16 inch on center framing that means connecting four trusses at each end of the house.
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 is a picture of another way of framing a roof a heavy timber truss at very wide spacing.
A lack of rafter ties is a serious structural issue in a conventionally framed roof.
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.
Instead of attaching the tie to the rafter you will be attaching it to the bottom chord of the truss.
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.
When all the trusses are installed and the first row of decking is on this brace is removed.
Notice the rafter spreader bolt.
For gable end roofs the florida code requires that you start by tying down roof framing members within 6 feet of each corner.
Installation is the same for trusses as for rafters see above.
It can be nailed temporarily to each truss as the next truss is put in place.
Some of these can support the roof and prevent ridge sagging and wall spreading.
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.
These are usually accomplished during a complete re roofing.
