Jacking Up Floor Joists Basement

The sagging floor was the symptom and somewhere under the house there had to be a cause.

Jacking up floor joists basement.

Find jack posts at lowe s today. Checking joists is easier if you have a basement or crawl space foundation because the joists are exposed. 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. Before you start jacking up your house you need to build a stud wall in the basement to support the floor joists in this area.

You cannot simply put a screw jack under the lowest spot and start turning. 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. On both sides of the problem area. Make repairs to settling piers and weak joists to fix swagging floors and roof lines.

A day until they re level. 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. Jacking them up too fast may cause cracks in the walls and floors overhead. To check joists and diagnose the problem a pro must pull up the flooring and the subfloor to see what shape they re in.

Jacking must proceed slowly. The idea behind sistering joists is that you jack up the sagging original joists add the new ones next to the old and join them together. As with other structural repairs jacking must also be done appropriately. If a crack or sag is isolated to one area the sister joist should extend at least 3 ft.

After the old joist is lifted by the jacks the new joist will now sit on the supporting walls or wall and i beam in our case while the old is lifted off of the structure. The only tools required is a bottle jack string straight claw hammer circular saw and a light source. Depending on exactly what needs to be repaired and the scale of the damage the cost to fix a floor. It took a long time for your floor to sink so you can t push it back up quickly without causing cracks and stress in the building.

You may have to take down the drywall or drop ceiling to do this.