Level 2 Diploma in Site Carpentry

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PowerPoint presentation

Roofing

Unit 207: Carry out first fix flooring and roofing

Level 2 Diploma in Site Carpentry

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Types of roofs

Pitched roof Flat roof

Level 2 Diploma in Site Carpentry

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Common roof typesMost roofs are constructed in one of two ways:

• traditional cut roof

• roof trusses.

Level 2 Diploma in Site Carpentry

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Single and double roofsA pitched roof can either be a single roof or a double roof.

A double roof with a larger span requires support for the rafters, which are called purlins.

Single roof Double roof

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Types of roofs

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Popular trussed rafter profiles

Images courtesy of Trussed Rafter Association; www.tra.org.uk. Reproduced with permission.

King post truss

Fan truss Attic or ‘room in the roof’ truss

W or fink truss

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Images courtesy of Trussed Rafter Association; www.tra.org.uk. Reproduced with permission.

Erection of common trussed rafters

Level 2 Diploma in Site Carpentry

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Types of truss clips

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Truss strapsRestraint straps fixed at maximum 2.0m from the centre.

Truss rafter fixed to wall plate

Level 2 Diploma in Site Carpentry

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Any questions?