Please tell me if I can do this......
I have an attached car port that is in great shape, but the slab is 16
inches below the house floor. In order to bring the new floor up "close
to" level with the existing house floor, I would like to lay 2x12s up
on end on top of the slab as the floor joists (I'll run the
HVAC/Plumbing/Electrical through these), then nail on the sub floor,
then build the 3 remaining walls and stand them up to become the new
Is this the right way to do this? Any advise will be greatly appreciated.
<< Please tell me if I can do this...... >>
Yes, if your building codes will allow it. You will have pull a building
permit, show the inpectors compliance with foundation requirements, etc. In all
it will be a good learning experience. You will find that your officials can be
very helpful in avoiding problems with your project. Good luck.
If I am understandig the issues, you will need to do quite a bit more.
Code will require a footing to frost line under any load bearing and
exterior walls in an occupied space. Your carport probably has no
footing. By the time you saw off the edge of the carport to dig and
pour a footing and stem wall, you may as well consider pouring a slab.
If you use joists above the carport slab, there will not be an
accessible crawl, but it is a viable plan. Any blocking in contact with
the carport slab should be at least wolmanized.
Footings are the first problem, most likely there is just a slab for
the car port. If there is a footing, your going to have to show it to
the inspector, he'll tell you what he needs.
If the old slab has a footing you can build up like you propose, but
you will need a vapoer barrier to prevent moisture from coming up into
the floor from the ground. You can lay a 6 mil plastic sheet down
before you lay our joists, this will get torn up some during
construction. There are some other products that may be a good
alternate. Bituthane 4000 waterproof membrane is something I have
recomended in the past.
Definatly get a permit and talk to the inspectors and plan reviewers.
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