Replacing Floor Joists With Concrete

A subfloor provides stability and a level surface.

Replacing floor joists with concrete.

This will create a weak spot. Homes with floor joists need a base to provide a surface on which to lay carpet ceramic tile hardwood laminate and or vinyl. Moisture and pest infestation can damage subfloor. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

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

A day until they re level. 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. 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. Freddiemercurystwin 5 jun 2012 7.

When replacing rotted floor joists it s important to be sure the girder and sill are still intact. This part of. Jacking them up too fast may cause cracks in the walls and floors overhead. Tack a beam under the sagging joists.

It is a 1920 s. 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. Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw. They are usually made of concrete steel or wood.

This helps the joist turn into the proper resting position. Homes built on a slab foundation may not require them as many types of flooring can lay directly on top of the concrete. I made a fast and simple jack post with two 2 4 screwed together. Once in place alongside the broken joist glue and screw the new joist to the old broken one.

Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor. 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.