Replacing Floor Joists With Concrete

Moisture and pest infestation can damage subfloor.

Replacing floor joists with concrete.

Once in place alongside the broken joist glue and screw the new joist to the old broken one. Short videos and slideshow documenting our attempt at replacing rotten joists and flooring in a kitchen of a house we are currently renovating. I made a fast and simple jack post with two 2 4 screwed together. 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.

It is a 1920 s. Replacing old unstable wood floor with reinforced concrete floor this project is about an old tobacco warehouse converted into a luxury hotel. 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. Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor.

A subfloor provides stability and a level surface. Steel floor joists are less likely to expand and contract so they won t warp or. Homes with floor joists need a base to provide a surface on which to lay carpet ceramic tile hardwood laminate and or vinyl. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.

Screw the subfloor material down to the new joist and say goodbye to that bounce and squeak. They are usually made of concrete steel or wood. Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw. 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.

A day until they re level. When replacing rotted floor joists it s important to be sure the girder and sill are still intact. This will create a weak spot. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

Tack a beam under the sagging joists. Making a jack post. Pry the floor joist from the subfloor with the back of your hammer. They help support main floors above the crawlspace.

Freddiemercurystwin 5 jun 2012 7. 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. This helps the joist turn into the proper resting position.