Replacing Floor Joists With Concrete

This will create a weak spot.

Replacing floor joists with concrete.

If only a few joists are rotted primarily at the bottom they can be repaired using a process known as sistering after the rot is cleaned away and the timber treated to prevent more problems a new joist is laid beside the old one and fastened to it. Moisture and pest infestation can damage subfloor. Assuming your joists are sound and ventilation to the void is adequate ripping up your timber floor and replacing with concrete is a complete waste of time and money and you will not end up with a warmer floor than just insulating between the joists. Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor.

Once in place alongside the broken joist glue and screw the new joist to the old broken one. This helps the joist turn into the proper resting position. Making a jack post. Homes built on a slab foundation may not require them as many types of flooring can lay directly on top of the concrete.

Short videos and slideshow documenting our attempt at replacing rotten joists and flooring in a kitchen of a house we are currently renovating. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. A day until they re level. Freddiemercurystwin 5 jun 2012 7.

Screw the subfloor material down to the new joist and say goodbye to that bounce and squeak. When replacing rotted floor joists it s important to be sure the girder and sill are still intact. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. Replacing old unstable wood floor with reinforced concrete floor this project is about an old tobacco warehouse converted into a luxury hotel.

Tack a beam under the sagging joists. If you have moisture in your crawlspace wooden beams are more susceptible to water damage and could encounter serious issues such as expansion and contraction. Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw. If the new joist is hitting a beam and the floor above and jacking is not an option an alternative approach is to cut small bevels on the two opposing edges that the touch the beam and floor board.

This part of. Jacking them up too fast may cause cracks in the walls and floors overhead. I made a fast and simple jack post with two 2 4 screwed together. A subfloor provides stability and a level surface.

Steel floor joists are less likely to expand and contract so they won t warp or. They are usually made of concrete steel or wood. It is a 1920 s.