Collar ties- Holds rafters together(have to be 1.8m apart or every third rafter.)
Ridge Board- Where the rafters meet at the highest point, (needs to be dead flush on the bottom of it)
Common Rafter- Forms the shape of he roof(must land 100% on ridge board)
Start Rafter-Is the same length as a common rafter.
Cleat- Stops immediate movement under ridge board.
Hip Rafter- Forms apex of hips, jack rafters fix to hip rafters. (has to be bang on straight, on a equal pitch roof it should be 45 deg)
Jack Rafters- Form hip shape (braces and straightens the hip rafters)
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| Dodgem block for the trusses. |
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| Dodgem block for the trusses. |
Cripple Rafter- Fits between a hip and a valley
Outriggers- Form eave of gable end (canter leavers off racking top player)
Short Hip- Connect change of height in ridge board
Valley Rafter- Form the valley of the house
Under Purlin Strut- Take weight from under purlin and transfers it to sterdy beam
Load Bearing Wall- Takes immediate weight from struts To under purlin struts
Mark drew up a few pictures to help most of us get our heads around it.After we went through all of this,I went over the road to the UCOL library and hired out the Rafters and Trusses book,Just to make things much easier for study.
After Smoko we progressed on with the build,We installed the remaining jack trusses.Then we were told to center the trusses at 830mm centers.We then set up a string line on the outside with a dodgem block,The blocks had to be nailed in place as they moved because of how tight the stringline was.A few of the trusses were then moved from side to side to get the adjustments right,Then they were fixed down.Tomorrow we should be nailing down the purlins and calculating the right amount of rows needed for the structure of the roof.
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| Picture showing the names for each section of the roof. |
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