Concrete Pour Over Existing Slab Forum

I want to increase the size of the concrete slab floor from my old shed for my new sauna the existing floor slab is aprox 2 4 x 1 8mtrs.

Concrete pour over existing slab forum.

Being the old slab is in pretty good condition you can pour directly over the old slab with 4 5 of new concrete. Use a 6x6 10x10 welded reinforcing wire in the new concrete to help prevent. The old concrete was over 20 years old. There are cases when pouring new concrete over old just isn t a viable solution.

When wouldn t i want to pour new concrete over old concrete. It was originally poured in multiple sections so it had some seams that looked like cracks. Steps involved in pouring concrete over existing concrete slab step 1. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.

However proper prep work is needed. Here s the catch if the existing surface is somewhat in a structurally sound shape and elevating its height to a few inches won t be a problem you can certainly freshen it up with a new layer of concrete. The condition of the existing slab is the primary factor that determines how long the new concrete will last. How to pour concrete over existing concrete.

One of the best tools that can be clean all the debris out of crack is a stiff bristle broom. Pouring concrete over the existing one. In the video below i poured a new stamped concrete patio slab right over the old existing concrete. 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.

This includes removing sand dead leaves and gravel. Sweeping dirt s debris over the existing concrete slab will allow bonding to take place. And i wish to increase the size to 2 4 x 2 4 mtrs it will not have any thing heavy on it but will have to deal with water and heat from the sauna.