Do Floor Joists Need To Be Treated

Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor.

Do floor joists need to be treated.

Yes pt lumber can be used for framing including floors. Higher floors use something called a top plate instead of a sill plate that forms the outside structure for flooring joists on that level. The first piece of lumber commonly attached to the top of a house foundation is often called a sill plate. Maximum floor joist span for no.

1 ft 0 3048 m. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example. The joists were pressure treated lumber so i was surprised at how badly decayed they were. 1 psf lb f ft 2 47 88 n m 2.

2 grade of douglas fir are indicated below. This treated lumber is bolted to the foundation and the floor joists typically rest on it. In the past 2x4s or 2x6s were sometimes used as floor joists. Deck joists rotting from the top edge down because the deck boards and debris keep them damp for weeks after rain.

The rim joist is 1 8in to 1 4in higher than the floor joists. I m using a pt 2x12 for a rim joist with 2x12 floor joists. These problems must be addressed firsthand prior to implementing any restoration steps. Should i shim the floor joists prior to the installation of the sub floor to even it up or just subfloor over it and keep framing because it will eventually shrink to the level of the floor joist.

The allowable stresses of pt lumber are lower than non treated lumber which means it can not span as far. Since these come into direct contact with masonry they should be treated wood. Live load is weight of furniture wind snow and more. Dead load weight of structure and fixed loads 10 lbs ft 2.

But larger is not always better when builders are constructing a home or adding a room addition. Just click here sill plate video. Floor joists installed on second or third or higher levels double as ceiling joists for the level below. If wind is a concern metal tie downs can also be added to keep the home anchored properly to the foundation.

You can watch an informative video that shows a treated lumber sill plate and how it rests on a foundation. In buildings with basements the first level of floor joists serves the same purpose. He sees it all the time. Also pt lumber is corrosive so connections need to be such that they resist corrosion.