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07192006, 10:00 PM  #1 
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Finding length of gable boards
Is there a formula for figuring out the length of a gable fascia board?
I have the width of the gable (32') and I have the height (6') the pitch/rise is 412 Im trying to figure out the amount of soffit & fascia I need to order without having to climb up on the roof to measure the actual 1x6 boards. Thankyou Advertisement 
07192006, 11:11 PM  #2 
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Finding length of gable boards
AT 32 feet wide and 6 feet high in center you have 17.088 feet on each gable roof.
The pitch is actually 4.5/12. AdvertisementLast edited by joed; 07192006 at 11:15 PM. 
07202006, 07:46 AM  #3  
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Finding length of gable boardsQuote:
You have to figure at least 18' of rake. The formula is (a squared )+ (b squared) = (c squared). That's just one way. there are many.
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Joe Carola 

07202006, 11:52 PM  #4 
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Finding length of gable boards
Thankyou for your responses.
Can you tell me how you both figured that the rise is 4.5? What formula did you use to find this. Last edited by Borske; 07212006 at 12:12 AM. 
07222006, 11:54 AM  #5 
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Finding length of gable boards
rise/run=6'/16'=4.5/12

07222006, 01:46 PM  #6  
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Finding length of gable boardsQuote:
One way is like this; rise/run x 12 = (pitch) Your example with a 6' rise and 16' run. 6/16 = .375 x 12 = 4.5 That will get you close to what you want but that will not be your pitch because your 6' is to the top of the rafter at the ridge line and that doesn't account for the rafter thickness and the H.A.P. cut (height above plate) which is the plumbcut line measured on the outside of the top plate vertical to the top of the rafter after you cut your birdsmouth. Once you cut the level seatcut out you measure this. This means that your pitch will be lower than 4.5/12. That 4.5/12 is with a perfect triangle with a 6' rise and 16' run giving you a 17' 11/16" diagonal. You will have a different pitch and measurement with whatever rafter stock you use.
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Joe Carola 

08232006, 08:25 PM  #7 
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Finding length of gable boards
I forgot to say thankyou...
Thankyou! Advertisement 
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