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close this bookCarpentry for Vocational Schools - A Teachers Handbook
close this folder12. CEILING
View the document(introduction...)
View the document12.1. Ceiling joists
View the document12.2. Purpose of the ceiling joists
View the document12.3. Joining ceiling joists
View the document12.4. Ceiling joists used as part of a roof truss
View the document12.5. Hanger
View the document12.6. Manhole
View the document12.7. Stairway

12.4. Ceiling joists used as part of a roof truss

a) Roof truss: - A truss consists of one bottomcord, two topcords, one king post and few diagonal truss members. The topcords are acting like rafters and the bottomcord acts like a ceiling joist.


Figure

b) Bottomcord: - When roof trusses are used, the bottom-cord acts like a ceiling joist. In such cases the roof trusses have to be fixed, depending on the ceiling material, at the correct distance (Plywood: centre to centre 610 mm or 1220 mm). Where roof trusses are set 1220 mm apart, a separate construction has to be made to support the plywood in the centre between the two trusses and at the cross joints of the plywood.


Figure

c) Two storey house: - In buildings with two stories, the ceiling joists of the ground floor are the floor joists of the first storey.


Figure