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Old 08-20-2009, 11:38 AM   #1
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attic space


Hi all,
I am looking to convert my attic space in to living space.My question is can i beef up the trusses (taking out the web and adding 2x6 all around the original truss) that would give a 2x4 and a 2x6 for the floor and a 2x4 and a 2x6 for the rafter spaced 24'' on centers.I also would add a 2x6 collar and a 4' knee wall.The 2x4 and 2x6 would be the same size as a 2x10. I have a capecod with a 24' span and 17' deep and would give a nice size bed room.
Any advice
thanks in advance

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Old 08-20-2009, 11:59 AM   #2
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Adding a 2x6 joist on top of a 2x4 does not give you the strength of a 2x10
Trusses are built to carry very specific loads
You are trying to span the 24' or the 17' ?
Are there support walls that the new floor joists will rest on to reduce the span?

A 2x12 would be needed to span 17' without additional support

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Old 08-20-2009, 02:08 PM   #3
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thanks for the response scuba_Dave
well the span would be the 24'...but there is a bearing wall half way there so the floor joist would have to span just 12'..Would you happen to know the max. span for a floor joist made of a 2x6 stacked on top of a 2x4 and the span for a rafter made the same way. These would be on 24'' centers

thanks again

Last edited by rhys99; 08-20-2009 at 02:14 PM.
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Old 08-20-2009, 03:23 PM   #4
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A 2x6 depending upon the wood will span just under 10'
I do not know if adding the 2x6 on top of the 2x4 truss would help
You would most likely need an engineer to calc this
Any modification/addition to a truss system needs engineer approval is my understanding
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Old 08-20-2009, 04:34 PM   #5
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attic space


Yes, need 2x10's at the very minimum for any floor. I don't see a way to do your project unless you get all new rafters. Taking apart engineered trusses is a big no no.
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Old 08-21-2009, 07:20 AM   #6
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well, i was thinking i would save time and money by doing it this way.if i make the rafters like the attic rafters you can purchase and space them right it should hold just fine right..Does any one know an easy way to convert attic trusses in to rafters to make living space without pulling the entire roof system off..

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