Jack Up Sagging Floor Joist

Sistering is the process of mating up two boards with bolts nuts and washers so that the new board corrects or supports the other weaker one.

Jack up sagging floor joist.

The sagging floor was the symptom and somewhere under the house there had to be a cause. The only tools required is a bottle jack string straight claw hammer circular saw and a light source. If you have access to the basement or crawlspace it is possible to jack up saggy joists until they are level and then sister them so that they remain straight after the jacks are removed. Raise it another 1 8 inch weekly.

Crawl space joist supports are steel adjustable support posts that are installed to repair sagging floors. These reinforcing joists install quickly in crawl spaces with a complete installation taking about a day and provide a permanent solution. Make repairs to settling piers and weak joists to fix swagging floors and roof lines. Depending upon the conditions it is possible to strengthen or repair existing framing members such as floor joists or roof rafters by adding reinforcing material sandwiching the member on either side with plywood is sometimes worthwhile but the plywood must be installed correctly for greatest strength.

Use the level each time to check the sag on the joists until the sag appears to be gone. Well after doing the navy seal crawl up under the house we found that the joists that were supporting that floor were not actually attached to the sill plate any longer as seen in the photograph below. Crawl space floor joist jacks. Jacking up a floor and leveling it is easy with these simple instructions.