Download - Ceilings & Basic Roofing Revision Created by Michael Martin March 2004 / revised April 2007
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Ceilings & Basic Roofing
Revision
Created by Michael Martin March 2004 / revised April 2007
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General Revision
Textbook questions & answers Review A4 sheets Components sketches All calculation exercises ceilings and roofs
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Ceiling Frames Basic set-out of ceiling frame Members & their function
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Ceilings continued
What is the function of a hanging beam ?
To support the ceiling joists mid-span, must be blocked at ends and a counter beam?
What is the function of the ceiling joists themselves ?
To support the lining material and also act as a tie between opposing rafters
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Ceilings continued
Also support to members
Review your worksheets from this section
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Flat roofs
Generally less than 10º pitch
More often ceiling joists and rafters all in one
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Skillion roofs
Walls at either end at different heights
Two ceiling types, raked and level
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Lean to roofs
Constructed against an other wall or roof
Extensions Carports Verandas awnings
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Simplest method of marking skillion roofs
Scribe the birdsmouth
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Gable roofs
Members and their function
Finish’s Calculations Revise your
worksheets for this section
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Quick Questions
What is the function of a purlin? To give support to the rafters mid span Where can a strut gain support from? It either has to transfer it’s load to a load bearing
wall or a strutting beam What is the function of collar ties? To stop rafters from sagging acting as a tie
between opposing rafters above the purlin
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Set out of common rafters
Can be done with steel square or
By calculation
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Plumb & level bevel
Remember where they are in relation to the roof
P28 of text handout
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Transfer onto steel square
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Gable definitions – Review handout Span – horizontal distance overall the wall plates Rise – vertical height from the x-y line to where
the upper edge of rafters would intersect ½ span or run – plan length of rafter Centre line length or set out length – the
hypotenuse in the triangle, formed by the ½ span and the rise
Roof pitch – expressed in different ways, degrees, pitch ratio etc. see P56 of your handout notes
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Other roof members – left to right
purlin
strut
Wind bracingridge
Collar tie
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Other struts (this one is a half scissor)
Scissor struts
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Gable end finishes
Flush gable
Verge overhang ?
Boxed gable ?
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Extra members for boxed gables ? With boxed gable ends you have A bottom chord or tie piece Also gable studs for fixing of linings
Or for ties to veneer skin
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Calculations
Review you worksheets
Review calculation sheets recently done in class
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Now you can build this
Test next week 5:30 to 7:00
Then class continues after dinner break.