Timber Frame Roof Details

A timber frame truss roof with ridge beam purlins and common rafters is a stunning combination that creates visual interest and structural complexity.

Timber frame roof details.

Figure 2 2 roof framing terms. Many people still think that the roof structures of timber framed buildings look like the upside down hulls of boats. There is a hierarchy of timber framing at work here with trusses supporting the ridge and purlin beams. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches.

Below is a sketch of the original roof wall structural details for this building. Shipwrights were the original american timber framers. The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12.

44 0 1483 769518 fax. 2 heavy timber construction details. Timber frame standard details september 09 building 1 grosvenor court hipley street old woking surrey tel. Above these components is a rack of common rafters.

Line length is the hyptenuse of the triangle whose. The original roof was built using purlins beams extending between gable ends.