If the uneven floor is due to floor joists that have warped or twisted over time or were incorrectly installed the only way to level the floor is to.
Floor higher where joist is.
Use shims to correct other joist issues.
When possible position floor joists with any crook in the board facing up so the weight on the joist will tend to straighten it out.
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.
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.
A level floor isn t necessarily a.
This size is no longer acceptable when framing a structure.
Some newer homes have manufactured i beam shaped joists.
In ideal conditions a finish floor s surface will be flat across the entire installation area.
How to fix the floor when it is higher in the middle.
If the floor is sagging the damaged joist and or a few neighboring joists may need to be jacked up slightly to straighten or raise the floor so the sister joist can be put into place.
In buildings with basements the first level of floor joists serves the same purpose.
A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals.
Floor joists installed on second or third or higher levels double as ceiling joists for the level below.
Any large knots found near the edge of the board should face up as well so the weak wood of the knot will be compressed rather than stressed.
Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s.