Do concrete polished floors need expansion joints?

Question

Hi. I’m thinking of having a polished concrete floor installed. I’m wondering whether expansion joints will be needed?

James · Answer

I would suggest that expansion joints are used to try and eliminate any cracking in the finished concrete surface as possible. Once the slab has been laid and been able to set then the expansion joints would need to be cut into a minimum of 30% of the slab thickness but ideally 50% then the joint at the top will need to be sealed with a rubberised sealant to allow for and movement in the slab.

George · Answer

Depends on the size of the pour, but with expansion joints, you can just cut these in after you have finished and sealed the floor if it’s a substantial sized pour. Thanks, George

Do concrete polished floors need expansion joints?

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