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Mortar is used between bricks, cinder blocks, or stone to bind them and fill any gaps. It is made from sand, a binding agent (cement or lime), and water.

1 vote
2 answers
3k views

Has our new septic tank been properly waterproofed?

The masonry is held together by cement mortar and has been plastered with cement plaster. … However, posts online are telling me that neither masonry, mortar or plaster are waterproof. So is this guy totally wrong? Do we need to apply a waterproofing system to the septic tank? …
7 votes
5 answers
38k views

Is mortar waterproof?

I was advised by a professional that mortar is waterproof, however sources online are telling me that it's not. So is mortar waterproof or not? … Does waterproofness vary by mortar classification (e.g. M1, M2, M3 etc.)? …