How To Join Two Floor Joists

Only raise the jacks about 1 8 inch per.

How to join two floor joists.

But larger is not always better when builders are constructing a home or adding a room addition. If there was water damage make sure that whatever leaky pipe or condensation issue caused the rot is fixed. 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. 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.

Sistering or joining joists the term sistering joists is the practice of overlapping two joists by a certain distance across a beam to create an extended joist. The new sister joist is cut to the same length or slightly shorter as the old joist and is inserted into the joist cavity and snugged up against the old joist. 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. This is unusual in new deck construction and would only be necessary for very long spans that exceed the length of your longest boards.

Place two hydraulic floor jacks under the 4 inch by 4 inch post and raise the post until it contacts the floor joists. These problems must be addressed firsthand prior to implementing any restoration steps. Make sure your joist is straight because once you splice it this way it cannot be repositioned. Raise the jacks about 1 8 inch more.