Do Floor Joists Need To Be Treated

The rim joist is 1 8in to 1 4in higher than the floor joists.

Do floor joists need to be treated.

Since these come into direct contact with masonry they should be treated wood. In buildings with basements the first level of floor joists serves the same purpose. Yes pt lumber can be used for framing including floors. This treated lumber is bolted to the foundation and the floor joists typically rest on it.

Just click here sill plate video. In the past 2x4s or 2x6s were sometimes used as floor joists. You can watch an informative video that shows a treated lumber sill plate and how it rests on a foundation. But my friend wasn t.

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. But larger is not always better when builders are constructing a home or adding a room addition. The allowable stresses of pt lumber are lower than non treated lumber which means it can not span as far.

The first piece of lumber commonly attached to the top of a house foundation is often called a sill plate. 2 grade of douglas fir are indicated below. 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.

Not treating the initial problem most often floor joists need to be sistered because of two problems either water damage which leads to rot or termite damage that crumbled the joist. Higher floors use something called a top plate instead of a sill plate that forms the outside structure for flooring joists on that level. If wind is a concern metal tie downs can also be added to keep the home anchored properly to the foundation. Floor joists installed on second or third or higher levels double as ceiling joists for the level below.

Also pt lumber is corrosive so connections need to be such that they resist corrosion. This size is no longer acceptable when framing a structure. Maximum floor joist span for no. Deck joists rotting from the top edge down because the deck boards and debris keep them damp for weeks after rain.

Dead load weight of structure and fixed loads 10 lbs ft 2. 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. Live load is weight of furniture wind snow and more. 1 ft 0 3048 m.