Floor joists and
After that, you will put up the rim joist, which is usually a 2X10 on
its side, all the way around the outside of the foundation. See pic
Next, you’ll put the floor joists in and nail them through the outside
of the rim joist for extra strength.
They should be on either 16″ or 24″ centers depending on
what the inspector says. I’d prefer 16″ centers for extra strength.See
While the floors are open like this, you can take advantage and run
some of your plumbing lines.
Once the floor is on it will be more difficult to get
long ABS pipes or copper pipes into the crawl space. You can even run
some of your Electrical and Network cables while it’s open.
Once the joists are in place, you can cover them with the floor
material. It’s called subfloor because there will be a top floor that
gets put in with the finish work.
A good material is 5/8-inch plywood or waferboard. This
is where you see if your foundation is in square or not. If it’s not in
square you’ll be cussing a lot throughout the whole building process.
The sheets won’t fit together very well and there will be a lot of gaps.
That’s just one of the many reasons why it’s so
important to get the foundation perfectly square before you pour it.
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