Width of bump out?

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mlang15
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Width of bump out?

Post by mlang15 » Sat Feb 10, 2018 9:57 am

I’d like to add a bit of square footage to the back of my house on the upper level. I know the rule is for ever foot of bump out you sister the joist inside two feet. Are there maximum width allowances of the bump out? I’m thinking it would be about 15 ft.


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Shannon
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Re: Width of bump out?

Post by Shannon » Sat Feb 10, 2018 3:28 pm

Should really be no restriction there. You will likely have I have a engineered design to get a permit.
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A. Spruce
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Re: Width of bump out?

Post by A. Spruce » Sat Feb 10, 2018 5:09 pm

To be clear, you want 15' out from the house, not 15' along the house wall, correct?

You will need engineered plans to add a cantilever to the side of the house, max you're going to gain is probably about a 4' to 6' extension from the house wall. Anything over that will require support footings and posts to carry the load.
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Shannon
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Re: Width of bump out?

Post by Shannon » Sun Feb 11, 2018 7:46 am

Oh ya if you are talking 15' projecting out from the house ,then that will never happen with just a unsupported cantilever. I may have misunderstood you there?
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mlang15
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Re: Width of bump out?

Post by mlang15 » Sun Feb 11, 2018 10:05 am

You had it right to begin with.... 2 ft out from the house and 15’ along the house wall

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A. Spruce
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Re: Width of bump out?

Post by A. Spruce » Sun Feb 11, 2018 11:55 am

Then you can get away with cantilevering, but you'll still need engineered plans to take to the building department.

The engineer will not only spec out the materials for the cantilever they will also spec the header system to support what is above the wall being removed.
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Shannon
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Re: Width of bump out?

Post by Shannon » Sun Feb 11, 2018 2:41 pm

Be sure your projection from the house does was not infringe on any back set you are required from property lines
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