Presentation on theme: "Ceilings & Basic Roofing"— Presentation transcript:
1 Ceilings & Basic Roofing RevisionCreated by Michael Martin March 2004 / revised April 2007
2 General Revision Textbook questions & answers Review A4 sheets Components sketchesAll calculation exercises ceilings and roofs
3 Ceiling FramesBasic set-out of ceiling frameMembers & their function
4 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
5 Ceilings continued Also support to members Review your worksheets from this section
6 Flat roofs Generally less than 10º pitch More often ceiling joists and rafters all in one
7 Skillion roofs Walls at either end at different heights Two ceiling types, raked and level
8 Lean to roofs Constructed against an other wall or roof Extensions CarportsVerandasawnings
9 Simplest method of marking skillion roofs Scribe the birdsmouth
10 Gable roofs Members and their function Finish’s Calculations Revise your worksheets for this section
11 Quick Questions What is the function of a purlin? To give support to the rafters mid spanWhere can a strut gain support from?It either has to transfer it’s load to a load bearing wall or a strutting beamWhat is the function of collar ties?To stop rafters from sagging acting as a tie between opposing rafters above the purlin
12 Set out of common rafters Can be done with steel square orBy calculation
13 Plumb & level bevel Remember where they are in relation to the roof P28 of text handout
15 Gable definitions – Review handout Span – horizontal distance overall the wall platesRise – vertical height from the x-y line to where the upper edge of rafters would intersect½ span or run – plan length of rafterCentre line length or set out length – the hypotenuse in the triangle, formed by the ½ span and the riseRoof pitch – expressed in different ways, degrees, pitch ratio etc. see P56 of your handout notes
16 Other roof members – left to right ridgeWind bracingpurlinCollar tiestrut
17 Other struts (this one is a half scissor) Scissor struts
18 Gable end finishesFlush gableVerge overhang ?Boxed gable ?
19 Extra members for boxed gables ? With boxed gable ends you haveA bottom chord or tie pieceAlso gable studs for fixing of liningsOr for ties to veneer skin
20 Calculations Review you worksheets Review calculation sheets recently done in class
21 Now you can build this Test next week 5:30 to 7:00 Then class continues after dinner break.
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