Concrete Overlay Over Wood Subfloor

Utilizing control joints along long seams or large areas is important. The overlay may be as thin as 3 8 of an inch so the surface prep is keenly important. They can be used over pre cast concrete planks wood subfloors in multifamily housing and on slabs on grade in single family homes.

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Metal lath stapled over plywood substrate.

Concrete overlay over wood subfloor.

Replace any weak or water damaged wood. A subfloor over radiant in floor heat sunk in concrete useless radiant heat. Concrete floor video on how to install concrete over an existing wood subfloor. The installation of calcium aluminate cement based self leveling concrete param 5500 along with expanded metal lath for reinforcement is a successful fast track method to convert a plywood subfloor into a beautiful concrete floor.

You would then need to find another way to heat the kitchen. I would not be surprised to see that the crack had followed a seam in the plywood or decking in the sub floor. The substructure must be well construction to successfully support a cementitious overlay. We recommend applying param 5500 at a minimum thickness of 3 8 1 2 is preferred to withstand lateral movement and traffic stress.

It s best to place the underlayment over 3 4 inch thick plywood fastened with screws at 12 to 16 inch intervals to help decrease deflection and add stability. Your subfloor would have to be concrete with the new wiring sunk into the. You can use overlays to create concrete surfaces that run up wood walls. Overlays are also used down wood stairs over wood countertops and more often than not across wood floors or decks.

Installing concrete overlays over a wood surface is tricky but it can be done. Overlays over wood surfaces. Why would you want to do this. Find out how to this is done properly.

Secure loose boards with deck screws and fill open seams with rapid setting polymer modified concrete. You can turn off the heat to the floor if you put a subfloor over top. Prepare by sanding down to clean bare wood. If you re applying the concrete topping to a wood floor where you have moisture concerns a flexible waterproofing membrane over the plywood is all that is needed to provide protection from moisture.

Self leveling concreteunderlayments are used to rehabilitate old floors that are out of level. The heat transfer to subfloor will be very very little. The sub floor must be free of deflection l 360 considering both live and dead loads.

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