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beam replacement


jjgip's Avatar
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01-05-14, 07:59 AM   #1  
beam replacement

I have an old 20' x 30' cabin in the mountains all one room. There is a 4" x 6" beam that runs the length of the cabin with a 4" x 6" in the middle. The two 15' spans sag about an 1" to a 1-1/2". I am going to remodel and plan on cutting my own beams to replace these. No permits are needed. The cabin is 2 x 4 construction and very sound. What size beams should I use?

 
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Pilot Dane's Avatar
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01-05-14, 01:45 PM   #2  
If using modern store bought lumber just search online for lumber span tables. What size is needed will depend on the wood used, grade and spacing but expect something around 2x8 or 2x10. Attaching them to your existing 6" high beam will be the interesting part since the joists will be taller than the beam.

 
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01-06-14, 08:13 AM   #3  
It is the 4" x 6" beam that i'm replacing not the joists. The beam i'm making my self out of Doug-fir. Thanks for the help.

 
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01-06-14, 01:14 PM   #4  
How far is the beam spanning? Generally in older cabins they don't span the full distance but have piers along the way breaking it into a series of shorter spans.

 
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01-07-14, 08:17 AM   #5  
Two 15' spans. The beam runs the 30' length of the cabin with 1 post in the middle.

 
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01-07-14, 08:25 AM   #6  
I forgot to say this beam supports the ceiling joists not the floor. There is a sleeping loft above.

 
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