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Valley truss (Read 3333 times)
fred09
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Re: Valley truss
Reply #6 - Jun 11th, 2010, 12:03pm
 
Thanks for that JOINER - I seem to have a mental block on using the word rafter which obviously doesn't help when you're working on a roof!
I used a speed square to try and work it out but the valley/hip scale lines up with 15 when I measure the 42 degree of the roof pitch.  Trigonometry! Should have concentrated more at skool
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Joiner
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Bridgnorth, Shropshire, England
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Re: Valley truss
Reply #5 - Jun 11th, 2010, 10:20am
 
Not really (they can also come off purlins), just needed to get my head around it, not helped by your reference to a "valley truss", by which I assume you mean the valley rafter?

Difficult to describe it all in words, so perhaps it might help if you take a look at this...

http://www.familyhandyman.com/DIY-Projects/Indoor-Projects/Attics/Attic-Remodeli...

It's a US site, but all the references are there and it gives an excellent step-by-step view of the different stages, including the laying out of the valley rafters.
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fred09
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Re: Valley truss
Reply #4 - Jun 11th, 2010, 9:35am
 
Sorry for the delay but I couldn't log in! My fault.........I think.
The dormer is on the eaves. Does this make a difference?
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Re: Valley truss
Reply #3 - Jun 8th, 2010, 8:28am
 
Is it a ridge or eaves dormer?
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fred09
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Re: Valley truss
Reply #2 - Jun 7th, 2010, 6:23pm
 
Tried a 48 but this didn't line up with the line of the dormers roof. Something weird going on for sure.
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Re: Valley truss
Reply #1 - Jun 7th, 2010, 6:13pm
 
Try a 48 cut on some scrap.

90-42=48
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fred09
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Valley truss
Jun 7th, 2010, 6:02pm
 
I have constructed a dormer window with the dormers roof angle matching the original roofs, namely 42degrees. When I cut the valley truss I thought I cut a 42 degree cut with a 45 degree bevel as it fits diagonally from the old roof to the new, but this doesn't fit. I had hoped to then fix 150x25 as the valley trough then lined with lead to give a good water seal. What am I doing wrong ??
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