Graphical Construction Glossary >> Roofs and roofing. >> Roof Types >> collar tie roof

Collar Tie Roof
A short span roof without a ceiling joist or other tie at the wall plates. A collar tie is used to create greater head height.
Couple roof
The simplest of all the ridged roof, a roof with no ties to stop the rafters spreading. Suitable for short spas only,
Couple Close Roof
A simple ridged roof with ceiling joists acting as ties at the wall plates.

a collar tie roof
A simple roof suitable for small spans used to create head height on short walls.

The joints between the ties and the rafters can take a few forms, from a bolted connection (see below) to the halved (part dovetail) joint that I show above. Actually it would not be a full halving joint in either member but more likely a third cut out of each. A basic principal is to not to make something weaker at the expense of good looks.

collar ties in exposed roof
A simple open roof with the ties mid span.

a small couple roof
An old small couple roof from the underside.

A couple roof
A simple couple roof. Simple but not too strong.

couple close roof
With the addition of ties in the form of ceiling joists the roof can span larger distances and carry greater loads.

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Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
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