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Old 09-09-2008, 04:13 PM   #1
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ridge board height


hi all
new to the site and any help / advice would be appriecated
i need help on how to work out at what height to put in a ridge board ( 7 x 2 )

wallplate inner to center = 2085mm
wallplate outer to center = 2185mm
pitch 17.5 degrees

rafters 5 x 2
ridge board 7 x 2

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Old 09-09-2008, 06:53 PM   #2
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ridge board height


Some measurements are metric; those that aren't indicated are as well? Might help those who use English units to convert them all to same system so that they can easier help you.

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Old 09-10-2008, 03:55 PM   #3
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ridge board height


ridge board height ?????

center to inner wallplate = 2085 mm
center to outer wallplate = 2185 mm
ridge board = 177.8 mm x 50.8 mm (7 x 2 )
rafters = 127.o mm x 50.8 mm (5 x 2 )
wallplate = 101.o mm x 75 mm (4 x 3 )
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Old 09-10-2008, 03:57 PM   #4
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ridge board height


[quote=flashing blade;156945]ridge board height ?????

center to inner wallplate = 2085 mm
center to outer wallplate = 2185 mm
ridge board = 177.8 mm x 50.8 mm (7 x 2 )
rafters = 127.o mm x 50.8 mm (5 x 2 )
wallplate = 101.o mm x 75 mm (4 x 3 )
pitch at 17.5 degrees thanks
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Old 09-10-2008, 04:52 PM   #5
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ridge board height


Quote:
Originally Posted by flashing blade View Post
ridge board height ?????

center to inner wallplate = 2085 mm
center to outer wallplate = 2185 mm
ridge board = 177.8 mm x 50.8 mm (7 x 2 )
rafters = 127.o mm x 50.8 mm (5 x 2 )
wallplate = 101.o mm x 75 mm (4 x 3 )
Why do you need the ridge board height? All you have to do is cut four common rafters and nail two on each end front and back and then slip the ridge in between the plumbcuts of the rafters. That will set your ridge height.
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Old 09-10-2008, 05:28 PM   #6
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ridge board height


thanks joe

i need the ridgeboard height to give me a pitch of min 17.5 degrees , so i could set it in place then cut the rafters to suit

im not a joiner by trade ,and not converse with the termanology,but what i think your saying is cut the rafters first then offer up the ridge board ,if this is correct how would i find or work out the rafter length needed

thanks
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Old 09-10-2008, 05:54 PM   #7
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ridge board height


Quote:
Originally Posted by flashing blade View Post
thanks joe

i need the ridgeboard height to give me a pitch of min 17.5 degrees , so i could set it in place then cut the rafters to suit

im not a joiner by trade ,and not converse with the termanology,but what i think your saying is cut the rafters first then offer up the ridge board ,if this is correct how would i find or work out the rafter length needed

thanks
The run of your rafter to the inside of your plate using your 2085mm minus half the thickness of your 2" ridge is 1" makes your run 6' 9-1/16" using a 17.5 pitch.

You can calculate any rafter given by any degree or any pitch using a Construction Master Calculator for example.



6' 9-1/16" [Run]

17.5 [Pitch]

[Diag] = 7' 1" (Rafter Length)

[Rise] = 25.56651" or 25-9/16" (To bottom of rafter)

5 [Inch] [Run]

17.5 [Pitch]

[Diag] = 5.242646" or 5-1/4" (Plumbcut height at ridge)

[+] 25.56651" = 30-13/16" or 2' 6-13/16" (Ridge Height)
Attached Thumbnails
ridge board height-diy-rafters.jpg  
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Last edited by Joe Carola; 09-10-2008 at 06:25 PM.
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Old 09-10-2008, 06:23 PM   #8
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ridge board height


Very good Joe,

That is a lot better than ...hmmm... that looks about right...
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Old 09-11-2008, 02:16 AM   #9
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ridge board height


thanks joe
very helpfull
also much appricated your drawing
should be able to sort now

paul

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