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Flat Roof & Introduction to Gable Roof Created by Michael March 2004 / reviewed march 2008.

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Presentation on theme: "Flat Roof & Introduction to Gable Roof Created by Michael March 2004 / reviewed march 2008."— Presentation transcript:

1 Flat Roof & Introduction to Gable Roof Created by Michael March 2004 / reviewed march 2008

2 Flat roof construction P23 & 24 in Carp 11 Flat roofs combine the roof and ceiling frame in one Generally described as one with a pitch less than 10 deg. To allow for extra loads the rafters / ceiling jiosts are increased in sectional size

3 Ceiling types Ceilings can be either lined on the rake or rafters laid flat and use graded battens to give fall to roof

4 Variations to ceilings

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7 Skillion roofs Single sloping roofs Walls at either end of roof at different heights Internal walls parralell to end walls will be at different heights Walls at 90 deg. to end walls will taper in height under the sloping rafters / joists

8 Two ceiling designs

9 Lean – to – Roof construction This type is constructed against an existing wall or other roof Simple extensions Carports Verandahs Awnings

10 Rafter / Ceiling variations Common on carports, open exposed rafters

11 Other types

12 Simplest method of marking With skillion roofs the simplest thing is to scribe the rafter over the supporting plates

13 Calculation of skillion rafters (eg) calculate the quantity of 125 x 50 rafters required for the roof 4.2m long and 2.7m wide, rafter spacings 600mm centres, the difference in height of plates is 900mm Length of rafter = (run of rafter)² + (rise)² No. of rafters = (length of building) + 1 spacings

14 Answer – length of rafter 2.7² +.900² = = 8.1 = lin/m Order 3.0m lengths

15 Number of rafters (4.200) = = 8 Order 3.0m rafters

16 Roof Components – Gable roof

17 Ridge Collar tie Strut Plumb cut Span ½ Span Ceiling joist Common rafter Purlin Tail piece or overhang Eave width or eave overhang Component names

18 Gable roof definitions Complete answers on your work sheets Roof span: Is the horizontal distance measured overall the wall plates Span

19 Rise: Is the vertical height measured from the x – y line to where the upper edge of the rafters would intersect Rise

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21 Other Reference Other reference for gable roof definitions and sketch – carp 11, pages 27 to 30


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