Graphical Construction Glossary >> Roofs and roofing. >> collar tie
As the name suggests these ties help to tie the rafters together. They stop the roof from spreading. In one sense you could say that the ceiling joists also are ties and when they are fixed securely to the rafters at the wall plate then they stop the rafters from spreading at the foot.
Quite often a designer will specify short collars at the ridge and I have always been in favour of this. It is an easy and cheap way to add strength.
In line with modern practice simply making the connections with nails is not done anymore. Bolts or timber connectors are used.
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