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Sheathing Cuts For Valley

 
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Old 10-14-2018, 12:18 PM   #1
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Sheathing Cuts For Valley


It's been an awfully long time since I've been on a roof, nevermind framing one and I'm looking to improve a little in how I approach cutting sheathing.

I've got this 7/12 roof to work with and going into the valley I measured the long and short points. It worked ok but it wasn't perfect. I know there is a better way and I'll be ordering a certain book everyone likes but tomorrow I need to sheath a gable valley set that runs perpendicular to the main roof down from other side of the valley to meet the sheathing I cut to valley last week. Is there any mathematical way to figure that out? Something better than trying to cut long and short points? If I could get one measurent then determine the measurent down the other side of the 8 ft sheet using a ratio of some sort that would be great and take the guess work out. Is there a feature in BuildCalc that would work for determining that?

I've been playing with hanging doors and installing shelving too long...
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Old 10-14-2018, 01:00 PM   #2
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Re: Sheathing Cuts For Valley


Sheathing angle is found using the Hip/Valley function in BuldCalc. It will figure both regular and irregular hip/valleys.

Tom

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Old 10-14-2018, 04:27 PM   #3
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Re: Sheathing Cuts For Valley


So all the rafters are already in place? You will probably spent more time scratching your head than installing sheets. Just measure up the roof 4 then measure across to get long point. No big deal.


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Old 10-14-2018, 04:52 PM   #4
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Re: Sheathing Cuts For Valley


I've forgotten almost everything I learned about roof framing and just use this site now :-)
https://www.blocklayer.com/roof/roofeng.aspx
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Old 10-14-2018, 06:10 PM   #5
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Re: Sheathing Cuts For Valley


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Originally Posted by Caleb1989 View Post
So all the rafters are already in place? You will probably spent more time scratching your head than installing sheets. Just measure up the roof 4 then measure across to get long point. No big deal.


-Caleb

John 3:16


I prefer to leave the advanced mathematics for other things.

Just too quick to field measure it.


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Old 10-14-2018, 06:24 PM   #6
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Re: Sheathing Cuts For Valley


Quote:
Originally Posted by Youngin' View Post
It's been an awfully long time since I've been on a roof, nevermind framing one and I'm looking to improve a little in how I approach cutting sheathing.

I've got this 7/12 roof to work with and going into the valley I measured the long and short points. It worked ok but it wasn't perfect. I know there is a better way and I'll be ordering a certain book everyone likes but tomorrow I need to sheath a gable valley set that runs perpendicular to the main roof down from other side of the valley to meet the sheathing I cut to valley last week. Is there any mathematical way to figure that out? Something better than trying to cut long and short points? If I could get one measurent then determine the measurent down the other side of the 8 ft sheet using a ratio of some sort that would be great and take the guess work out. Is there a feature in BuildCalc that would work for determining that?

I've been playing with hanging doors and installing shelving too long...



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Old 10-15-2018, 06:33 PM   #7
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Re: Sheathing Cuts For Valley


A long long time ago there was a little book that came with a square that had all the measurements in it for the valley sheathing based on pitch. Just about everything can be figured mathematically but some times it's just as easy and just as fast to just measure.
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Old 10-15-2018, 07:15 PM   #8
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Re: Sheathing Cuts For Valley


It has been awhile, but in the table on the framing square, there is a column which gives you the other dimension to hold with the 12” side to give the you angle. I can’t remember which one. In my framing days, I had the difference in dimensions between the short and long points on a sheet of plywood, for each roof pitch. It would probably take me a few test cuts to get it right.
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Old 10-15-2018, 10:26 PM   #9
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Re: Sheathing Cuts For Valley


Here's some tables I made a long time ago.
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Old 10-15-2018, 10:28 PM   #10
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Re: Sheathing Cuts For Valley


Cl is cut length- as in length of diagonal cut for a given pitch. I just measure top or bottom length, use knife to make a notch and then measure the diagonal length for the given pitch- perfect valley angle every time.
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Old 10-15-2018, 10:30 PM   #11
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Re: Sheathing Cuts For Valley


A table I made long ago. Cl is cut length- as in length of diagonal cut across sheet for a given pitch.
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Old 10-15-2018, 10:36 PM   #12
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Re: Sheathing Cuts For Valley


hey, good to see you posting again...
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Old 10-16-2018, 01:56 PM   #13
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Re: Sheathing Cuts For Valley


Thank you very much for the education all. It was nice to see different methods to making things work. Got the valley figured. It turned out good.

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