An extremely clear video with superb animations detailing all the important elements when setting out a bastard hipped roof. The animation and associated drawings really help one understand the true geometry of the roof and the constructions needed to perform the relevant joinery. Many thanks for providing such detailed content !
You are more than welcome.....its great that we have this type of animation option to impart such knowledge on this type of subject.....glad you found it useful.
If you go to 10.50 mins in to video and pause, you will see side view of both sets of jacks. ....ìn this example,the lower pitched jack is from the main side of the roof and so it has the same plumb cut as the common rafter on that side of the roof. ....The jacks on the hipped end in this example will have the same plumb cut as the crown rafter. Keep video paused at 10.50mins and note the following; ...the side view of the edge cut (end grain hatch/pattern) can be seen at this point of the video ...so to get the edge cut, draw side view of this edge cut on the side of your own jack. ...you now have 2 plumb lines on the side of your jack (one of these plumb lines now needs to be on the far side of your jack), ....so square one of those lines across the top edge of your jack to the far side, ...from where this line hits the far side of jack, draw a line back to top of other plumb line on near side of jack, ...this line you have just drawn on the top edge of you rafter is the jack edge bevel for this jack. same procedure as above for the other jack (for hiped end)...note its edge cut will be blunter compared to the other jack (main side) in this example.
Thanks for the reply that's helped a lot my other question is, with the hip rafter is the plumb cut the same plumb cut for both sides of the hip I understand that the edge cut is different
When setting out the hip for fascia and soffit do you always swing the hip closer to the crown rafter instead of the common side ? Another question when the hip needs to be planed do you just plane it unit it has the same upstand as the rafters is that correct
Hi violet, you will find that the hip tail will swing more to the common side when the common side of roof has a lower pitch° than the crown. But if the crown has the lower pitch° then the hip tail will swing more towards the crown end of the roof. If you plane the common side until it matches commons up-stand you will have planed too much off...Instead....Mark the up-stand on the crown side of hip matching the crown up-stand.....the heel cut on BM will be cut at an angle to sit against the wall plate......cut it...place it in position keeping the crown rafter edge and hip edge lining up where they meet the the ridge... now observe the common side of hip....on this common side you will see the hip is above the common rafter edge slightly....this is the portion that needs to be planed off-square on this side of the hip. The top edge of the hip is now banked to match both roof surfaces.
An extremely clear video with superb animations detailing all the important elements when setting out a bastard hipped roof.
The animation and associated drawings really help one understand the true geometry of the roof and the constructions needed to perform the relevant joinery. Many thanks for providing such detailed content !
You are more than welcome.....its great that we have this type of animation option to impart such knowledge on this type of subject.....glad you found it useful.
Hello Michael I'm a bit confused how to get the jack plumb cut and the edge cut on the bastard hip
If you go to 10.50 mins in to video and pause, you will see side view of both sets of jacks.
....ìn this example,the lower pitched jack is from the main side of the roof and so it has the same plumb cut as the common rafter on that side of the roof.
....The jacks on the hipped end in this example will have the same plumb cut as the crown rafter.
Keep video paused at 10.50mins and note the following;
...the side view of the edge cut (end grain hatch/pattern) can be seen at this point of the video
...so to get the edge cut, draw side view of this edge cut on the side of your own jack.
...you now have 2 plumb lines on the side of your jack (one of these plumb lines now needs to be on the far side
of your jack),
....so square one of those lines across the top edge of your jack to the far side,
...from where this line hits the far side of jack, draw a line back to top of other plumb line on near side of jack,
...this line you have just drawn on the top edge of you rafter is the jack edge bevel for this jack.
same procedure as above for the other jack (for hiped end)...note its edge cut will be blunter compared to the other jack (main side) in this example.
Thanks for the reply that's helped a lot my other question is, with the hip rafter is the plumb cut the same plumb cut for both sides of the hip I understand that the edge cut is different
..yep...its the same plumb cut angle° on both sides of the hip
Very well explained
Glad it was helpful!
Excellent, thank you.
You are welcome!
When setting out the hip for fascia and soffit do you always swing the hip closer to the crown rafter instead of the common side ? Another question when the hip needs to be planed do you just plane it unit it has the same upstand as the rafters is that correct
Hi violet, you will find that the hip tail will swing more to the common side when the common side of roof has a lower pitch° than the crown. But if the crown has the lower pitch° then the hip tail will swing more towards the crown end of the roof.
If you plane the common side until it matches commons up-stand you will have planed too much off...Instead....Mark the up-stand on the crown side of hip matching the crown up-stand.....the heel cut on BM will be cut at an angle to sit against the wall plate......cut it...place it in position keeping the crown rafter edge and hip edge lining up where they meet the the ridge... now observe the common side of hip....on this common side you will see the hip is above the common rafter edge slightly....this is the portion that needs to be planed off-square on this side of the hip. The top edge of the hip is now banked to match both roof surfaces.