Pour New Concrete Floor Over Old

If you re concrete has large cracks and the slab may still be moving due to freeze and thaw conditions or settling then a tear out and replace is a better solution.

Pour new concrete floor over old. The condition of the existing slab is the primary factor that determines how long the new concrete will last. If the old floor is badly damaged you may have to break it up and lay a completely new floor. However most contractor will simply come out and place a rebar mesh on small pedestals above the existing floor and then pour enough concrete to level the area and cover the rebar mesh. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.

If the foundation beneath the slab is not sound the new concrete could sink or develop deep. There are cases when pouring new concrete over old just isn t a viable solution. It rolls or brushes on like paint very easy to install creates a bond between the old new concrete floors. Old concrete floors can be replaced by new ones simply by pouring freshly made concrete over the top.

The condition of the existing slab is the primary factor that determines how long the new concrete will last. So you may ask if pouring new concrete over the old one is a better option. For instance clean old concrete fix forms install steel bars or mesh if necessary pour concrete compact and finish concrete and finally cure the newly placed concrete. Then build a perimeter or a wood brace that is the same height as you want the concrete to be.

Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. Smooth the surface using a two by four or float then add texture as desired using tools or a broom. Placement of new concrete over old concrete shall be conducted according to a pre planned procedure in order to achieve desired final product. We d say no since concrete doesn t have any bonding agents of its own to grip onto the new layer but it s a yes if you get a layer in between the two and help the top layer adhere to the surface beneath.

If the foundation beneath the slab is not sound the new concrete could sink or develop deep potholes. When wouldn t i want to pour new concrete over old concrete. However you will need to clean and prepare the old concrete surface first. To lay new concrete sweep and clean the old concrete and saturate the old concrete with water.

Make sure the braces are level and lay down a barrier of wire mesh over the existing concrete inside of the barrier. When we pour concrete floors over existing concrete floors and the new floor is less than 3 inches thick we use a product called weld crete to bond the two floors together.