Joining Floor Joists Together

It is stamped into the wood at the factory with a hydrolic press.

Joining floor joists together. The truss companies use a gang nail to splice wood together pictured at left. Take some extra time and jack the damaged area up so that the new lumber doesn t need to be notched. Only raise the jacks about 1 8 inch per.

Jacking them up too fast may cause cracks in the walls and floors overhead. 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.

This is unusual in new deck construction and would only be necessary for very long spans that exceed the length of your longest boards. Raise the jacks about 1 8 inch more. A rock solid bond between the new plywood and the undersides of the joists is crucial.

Sistering joists is commonly used when adding onto an existing deck or repairing a deck. Tack a beam under the sagging joists. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.

But larger is not always better when builders are constructing a home or adding a room addition. A gang nail is basically a thin piece of metal stamped out so that many metal tangs stick out into the wood about a 1 2 or so. However doing this does not fix the slant that the floor has taken since the old joists got damaged.

In situations when sistering damaged floor joists with lumber of similar dimensions it can be easy to notch and slide the sister board into place. Place two hydraulic floor jacks under the 4 inch by 4 inch post and raise the post until it contacts the floor joists. You ll use lots of screws and construction adhesive.