Direct Method Presentation
This Presentation was prepared by
John Bridges
Of SWSI TAFE Granville college
2004
Developing Bevels using the
Direct Method
This Slide Show is to be used to explain the methods of
Directly Developing the bevels required for a
HIP AND VALLEY ROOF
Students are to complete their own drawings as
the facilitator progresses through the show
Step 1. Having previously obtained your Plumb Bevel from a
Pitch Board Setout. Start 100mm from one end and mark the
Plumb Bevel
100mm
Edge
1.
Face
1. Plumb Bevel Common Rafter
‘T’
Step 2. Transfer the thickness of the
timber to parallel the Plumb
Bevel
Step 3. Mark a line at 90o to the
Plumb Line.
Edge
2.
‘T’ Face
2. Level Bevel Common Rafter
NOTE: This triangle is in proportional to the rise
per metre run of the roof
The thickness of the piece of timber represents
the run or half span of the roof.
‘T’
Step 4. Mark a line square across the
thickness of the timber from
the point of the Level Bevel
Common Rafter
3.
Step 5. Join the end of this line back
to the point of the Plumb
Bevel Common Rafter to
form a Right- angle triangle
Edge
4.
Face
3. Edge Bevel Creeper
4. Edge Bevel Purlin
‘T’
Step 6. Extend the ½ Span line at 90o to the rise on the opposite side of
the Common Rafter
Step 7. Transfer the length of the Hypotenuse of the
Edge Bevel Creeper and Purlin triangle
Edge
5.
6.
Face
Step 8. Join this intersection point to the
top of the Rise
5. Plumb Bevel Hip
6. Level Bevel Hip
‘T’
Step 9. Transfer the Plumb Bevel Hip to the other end of the timber by setting a
sliding Bevel to the Plumb bevel Hip.
Edge
Face
Step 10. As for Step 2 transfer the thickness parrel to the Plumb Bevel and create a
Right-angled triangle starting at the intersection of the edge with the
thickness.
Edge
‘T’
Face
‘T’
Step 11. Mark a line square across the thickness of the timber from the point
of the Level Bevel Hip
Step 12. Join the end of this line back to the point of the Plumb Bevel
Hip to form a Right- angle triangle
Edge
7.
Face
7. Edge Bevel Hip
Step 13. Select a point along the True Length Common Rafter and mark a line
down the face at 90o from the edge
Step 14. Mark another line at 90o across the edge
Step 15. Transfer the length of this line down onto the True Length Common
Rafter and connect back to the intersection on the Plumb Cut
Edge
Face
The Face Bevel will be formed in the top corner of the
triangle where it intersects with the True Length Common
Rafter
Edge
8.
Face
8. Face Bevel Purlin
An alternative practical method to obtain
the Face bevel Purlin is to cut through the
Plumb and Edge cut for the creeper, then
cut off the point square across the edge
and face. The shape formed will provide
the Face Bevel Purlin in the top corner