Replace Sub Floor And Joists

A line of nails or screws that runs from wall to wall indicates the location of a floor joist.

Replace sub floor and joists. Make sure to get all of the damaged or moldy. Use 5 8 cdx plywood to replace the original subflooring. See typical tasks and time to repair a subfloor along with per unit costs and material requirements. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.

Begin by placing your new joist hanger at the location you previously marked. Pry the floor joist from the subfloor with the back of your hammer. Locate the floor joist below the subfloor at each side of the section to be removed. Secure plywood to joists.

The average cost to replace or repair a plywood subfloor in a 306 square foot room costs 555 or between 490 and 600 the average cost to install a new plywood subfloor is 620 or between 572 and 720. Typically floor joists are repaired or replaced working from below in a basement or crawl space. Cost to replace repair or install subfloor. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

If you don t have any carpentry experience you may want to call a professional carpenter to handle the project. Step 4 replace the old joists. When you replace the subfloor the new ends have to sit on the joists so cut out your wet subfloor along two joists on either side of the damage. Get fair costs for your specific project requirements.

Replacing a floor joist is best left to a professional especially if the joists are not easily accessible from a basement or crawlspace as this means parts of the floor and subfloor must be removed to access each problematic joist. Then set new joists same height as existing ones alongside the old. Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a. How to replace floor joists.

Whether joist hangers are present or not remove the old nails with your hammer and then remove the ends of the old joists. This exterior grade plywood is a good choice for damp or occasionally wet areas because it can withstand a moderate amount of moisture without deteriorating. Tack a beam under the sagging joists. The cost to repair a subfloor starts at 36 89 56 75 per square foot but can vary significantly with site conditions and options.

A day until they re level. See professionally prepared estimates for subfloor repair work. Then you can remove the old joists by tapping on them with your hammer until they pop out of place. Measure and cut plywood as needed to cover the damaged area.