We have an existingconcrete overlay - How thick should it be

[clockobby]

We have an existing (not level) sectional garage base - we need to overlay a new base for the new sectional garage. Any advice on recommended thickness, special bonding to existing base etc. ???

[simeonronacrete]

You can bond new concrete to old using Ronafix (a liquid) mixed with cement to form a bonding primer. Mix is 1:1 by weight or volume. Prep the old concrete to remove loose material, grease, oil, dirt, dust, laitence, at the very least using high pressure water jet. If very friable, weak, unstable then you'll need a mechanical scabbler or plane to take off the top few mm and leave you with a good quality hard concrete substrate.

Clean, leave damp, brush on primer, and apply new concrete or screed before primer dries. If you include Ronafix in the concrete you can lay at a minimum depth of 25mm.

See Ronafix Screeds Info Sheet. Feel free to call us on 01279 638700 and ask for the Technical Department if you have more questions.

Regards