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 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.

A simple open roof with the ties mid span.

An old small couple roof from the underside.

A simple couple roof. Simple but not too strong.

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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"When we build, let us think that we build for ever."John Ruskin 1819-1900