Do Floor Joists Need To Be Treated
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The allowable stresses of pt lumber are lower than non treated lumber which means it can not span as far.
Do floor joists need to be treated. In the past 2x4s or 2x6s were sometimes used as floor joists. I m using a pt 2x12 for a rim joist with 2x12 floor joists. 1 ft 0 3048 m. Dead load weight of structure and fixed loads 10 lbs ft 2.
Live load is weight of furniture wind snow and more. You can watch an informative video that shows a treated lumber sill plate and how it rests on a foundation. 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. These problems must be addressed firsthand prior to implementing any restoration steps.
The joists were pressure treated lumber so i was surprised at how badly decayed they were. But my friend wasn t. Also pt lumber is corrosive so connections need to be such that they resist corrosion. Deck joists rotting from the top edge down because the deck boards and debris keep them damp for weeks after rain.
2 grade of douglas fir are indicated below. 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. This size is no longer acceptable when framing a structure. Yes pt lumber can be used for framing including floors.
1 psf lb f ft 2 47 88 n m 2. Maximum floor joist span for no. Since these come into direct contact with masonry they should be treated wood. He sees it all the time.
Just click here sill plate video. This treated lumber is bolted to the foundation and the floor joists typically rest on it. 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. In buildings with basements the first level of floor joists serves the same purpose.
Floor joists installed on second or third or higher levels double as ceiling joists for the level below. 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. But larger is not always better when builders are constructing a home or adding a room addition. The rim joist is 1 8in to 1 4in higher than the floor joists.
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