Bastard Hip With Common Overhang

 
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Old 12-02-2015, 07:42 PM   #1
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Bastard Hip With Common Overhang


hi guys,

-from new zealand so some terminology may be different to yours!

we have to build a few trusses and pitch a roof with a bastard hip after christmas and i'd like a bit of feedback if you see any red flags in my description

the main roof is 29 degrees and the bastard is 39 degrees

on the inside of the building there are several exposed hardwood trusses,the top and bottom chords being 12x8 and the king/queen posts 8x8

we have a main truss at 29 degrees each side,a half truss at 39 degrees and 2 hip trusses at around 24.5 dgrees all coming together and sharing a common kingpost

directly on top of these trusses is the ceiling lining of t&g oak and immediately above that our roof framing (10x2),the ceiling lining will be fastened directly to the rafters.

there is a common height soffit (overhang?) and fascia all around this area,the overhang is also the same-6 inches

this brings me to my problem-the differing roof pitch gives me different plumb cuts on my rafter tails but i need to make it the same

if i put my 3x2purlins(battens?) on edge instead of flat on the steeper pitch this brings the plumb measurement to almost the same(close enough to not worry about)however this has the knock on effect of mowing the hips forward? or does it? i'm having problems visualising it!

any comments?
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Old 12-02-2015, 08:03 PM   #2
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Re: Bastard Hip With Common Overhang


I could spend a bunch of time replying here, or just post this link for you.

Money well spent.

http://www.amazon.com/Roof-Framers-B.../dp/0964335433

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Old 12-03-2015, 02:14 AM   #3
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Re: Bastard Hip With Common Overhang


First welcome and where about's in NZ are you from
Also flat soffit or raking?
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Old 12-03-2015, 02:20 AM   #4
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Re: Bastard Hip With Common Overhang


living and working in the queenstown area-seems like summers arrived at last

the soffit is flat.
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Old 12-03-2015, 02:49 AM   #5
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Re: Bastard Hip With Common Overhang


Do you need equal depth soffits?
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Old 12-03-2015, 03:01 AM   #6
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Re: Bastard Hip With Common Overhang


yep,both 6" and the soffit lining is 3 1/2" cedar t&g so anything beyond a minor difference will stand out
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Old 12-03-2015, 03:09 AM   #7
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Re: Bastard Hip With Common Overhang


you could set your plates higher on the steeper side that should keep your fascia lined up and soffit depth even.
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Old 12-03-2015, 03:15 AM   #8
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Re: Bastard Hip With Common Overhang



Like this
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Old 12-03-2015, 03:17 AM   #9
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Re: Bastard Hip With Common Overhang


could do but would that not lift the rafters away from the trusses?i'd then have to put firings on the undersides of the rafters for the linings?-i need a common ceiling line.

problem is if i was building this i'd adjust to suit as i was building but i'm going to have to explain this to one of the guys and i want it solved in my head before anythings cut-the timber for the trusses is about $350 pm!and a 3 month lead time!

hows work up there? good chippies are impossible to find down here at the moment,building is going off

Last edited by deedledeedle; 12-03-2015 at 03:20 AM.
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Old 12-03-2015, 03:21 AM   #10
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Re: Bastard Hip With Common Overhang


We are so busy booked out 2016 already, huge shortages of tradesmen as well.
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Old 12-03-2015, 03:42 AM   #11
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Re: Bastard Hip With Common Overhang


Quote:
Originally Posted by jlhaslip View Post
I could spend a bunch of time replying here, or just post this link for you.

Money well spent.

http://www.amazon.com/Roof-Framers-B.../dp/0964335433
if that was available in metric i'd probably order now!
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Old 12-03-2015, 05:55 AM   #12
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Re: Bastard Hip With Common Overhang


Quote:
Originally Posted by deedledeedle View Post
if that was available in metric i'd probably order now!
Can you not use conversion?

I know that our Canadian friends use metric and the convert.

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