Crumbly Concrete Garage Floor - Line with Plywood?

[Caspar]

Wondering if its a good idea to line my garage floor with plywood sheets? At the moment it has a very dusty and crumbly surface. Presumably it need to be screwed down. What thickness would be the best bet?
Thanks.

 

[crazycanuck]

If it is that crumbly, you won't be able to screw plywood to it ,as the screws won't hold.
I would pour a new surface in concrete 2" thick after properly cleaning old concrete.
they make special cement for thicknesses up to 2" . You might even add
a wire mesh to strengthen.
But talk to your cement dealer as your best guide.

 

[pompeyal]

Depending on how bad it is you can get a gallon of PVA adhesive, water it down 3 water 2 PVA and brush it in, it will soak into the crumblig cement and seal it....Al

 

[Click-Sure]

As pompeyal says seal with PVA then use a floor levelling compound, available from most builders merchants.

And if you want to go the whole hog, once this is dry paint with heavy duty concrete floor paint