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carpetagge 04-14-2008 01:26 AM

What I have is a carport attatched to the back of my house. The concrete slab it sits on is the full width of the house, (a nice drive way to the entrance of the carport). What I want to do is convert it to a bedroom.
my question is can I build a wall right on the slab or do I need to curb the slab and build the wall from curb? I'm not anything close to a carpenter, I can build a wall and handle the power, but I need help with is foundation. Any advice is appreciated Thanks,

mikey48 04-14-2008 09:36 AM

Your walls require a footing under the slab. The code will establish how deep and how wide. The weight of the walls will cause the slab to fail.

Maintenance 6 04-16-2008 03:19 PM

If driving and parking a car on it hasn't made it fail, I doubt the weight of a 2x4 wall will break it.

mikey48 04-16-2008 07:36 PM

Code requires a footing.

Cajun1 04-16-2008 09:27 PM


Originally Posted by Maintenance 6 (Post 116858)
If driving and parking a car on it hasn't made it fail, I doubt the weight of a 2x4 wall will break it.


That's a very good, insightful answer!:no:

Maintenance 6 04-17-2008 06:34 AM


Originally Posted by Joba Fett (Post 116919)
With idiodic responses such as this, no wonder these so called DIYer's get people hurt.

And just what made that an "idiotic" response? Think! First, the roof is already supported by some kind of structure, so the only load being imposed on the slab is the wall to close it off, which weighs a hell of a lot less than a car. Second, the wall load is dipersed across the length of the slab and is static, rather than the concentrated, dynamic load that the car tires impose. Much depends on where the OP is located. If he has to worry about frost conditions, and the slab is floating, that is an issue.

So far no-one has given the OP a good answer to his question. To the original question: First dig down along side of the fslab to see if there is a footer and foundation wall under it. If so, you can build on top, if not you may need to place those items and size them according to your local requirements for soil conditions, etc. Whether you need a building permit for this work depends on your local community. There are a few questions you'd need to answer before anyone here could give you further direction. Do you intend to step down into this room? Or build the floor to match the existing house? Does the roof of the house extend over the carport area? Or does the carport have it's own roof butted into the end wall of the house? Adding simple exterior walls will add little weight, adding a floor system with joists and beams will add some concentrated loads to specific areas that you will need to address. You first need to do some research.

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