How To Add Support To A Floor

Structural floor joist repairs.

How to add support to a floor.

Some newer homes have floor trusses which contain multiple smaller members designed to support as much weight as floor joists. Do this by either removing the flooring surface planks all the way across the floor and installing extra joists in the same direction as the original joists or by cutting smaller joists and installing them perpendicular to the original joists in the floor. The top corners at the outside ends of the joists may be cut at an angle to fit under the roof decking. If you still need help feel free to contact us.

Cut the sister joists cut new joist lumber for each of the sister joists using a circular saw. Click here to view our videos and our manual. How to add another support beam under floor joists my kitchen family room 12 5 feet wide and 30 feet long built over a dirt floor crawlspace that s about 4 feet high. Add extra support to a floor beneath the floorboards by adding additional joists to the floor.

Installing a joist support. Well first of all in terms of beefing up the floor joists sistering the floor joists by doubling them i don t necessarily think i would use plywood on them. The 2x10 floor joists span the 12 5 foot dimension spaced 16 oc. You might want to double up on the wood which means you will have to cut two square blocks and then place one on top of the other.

Well i mean it may not be flimsy but the thing is if you want to sister a floor joist and help support it you need to go from bearing point to bearing point. There are a few websites with calculators that will allow you to enter. Start by making sure the original bridging is tightly fastened. While you are installing a joist support or a series of supports you should add enough not only to make the floor strong but you should make sure that there will be no deflection.

I would double them. Measure the length of the old joists and note how much they overhang any supporting walls or beams and the exterior walls. You can take a 2 x 6 or a 2 x 8 and use that piece of wood for the block after you make a square shaped cut. As a remodeling contractor and carpenter one common structural framing issue i see alot of in bathroom remodeling jobs are floor joists that were cut drilled notched or need to be cut out to accommodate plumbing pipes and drains.

Cut a wooden block to go between the top of the post and the beam or floor joists for which it is supporting. Need some help using floorplanner. Then measure the span of the joists the distance between walls or beams that support the joists. This is because deflection can cause a floor like tile to crack.