roofing 1
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Level 2 Diploma in Site Carpentry
© 2013 City and Guilds of London Institute. All rights reserved. 1 of 9
PowerPoint presentationRoofing
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 types
Most 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 roofs
A 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
Level 2 Diploma in Site Carpentry
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Types of roofs
Level 2 Diploma in Site Carpentry
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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 straps
Restraint 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?
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