Truss Rafters or Cut Roof Timbers

When not using SIP's for your roof, there are two basic methods for pitched roof construction.

• Roof Trusses
• Cut Roof Timbers

Roof Trusses

Roof trusses are generally constructed by joining timber members together with galvanised steel plate connectors at junctions. The plates are inserted in factory conditions under heavy pressure on both faces.

Roof trusses are delivered to the site as prefabricated components where they are fixed to the wall plate with suitable metal plates. Wall plates should be fixed to the supporting walls. Trusses do not require any ridge board or purlin. To ensure overall stability trusses are fixed together with longitudinal, diagonal and chevron timber braces. These are normally fixed to rafter members, internal members and ceiling chords.

The final stage of roof construction is to apply roof membrane or felt, battening and Roof Finishes.

Cut Roof Timbers

Cut Roofs are generally constructed by forming timber rafters connected to Purlins or other Structural Members. The Cut Roof Timbers are fabricated on site where they are fixed in place. They are often used where the roof design is unsuitable for truss roofs which are simpler and generally lower cost.

The final stage of roof construction is to apply roof membrane or felt, battening and Roof Finishes.

Roof insulation for the Hybrid SIP Solution is not included in the SIP Building System but can be added at additional cost following specification by the architect.

SIP Building System

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