Honeycombing
Voids in hardened concrete where mortar failed to fill the spaces between coarse aggregate, usually from inadequate compaction or congested reinforcement.
On an actual building
It leaves a porous, weak zone that is a direct water path and offers no protection to reinforcement. In water-retaining structures it is a common source of leakage.
What we most often have to correct
That rendering over it solves it. The void runs into the section and needs filling by injection or breaking out and reinstating.
Terms that come up alongside this one
- Cold Joint
An unplanned joint formed when fresh concrete is placed against concrete that has already begun to set, so the two do not knit together..
- Micro-Concrete
A flowable, shrinkage-compensated cementitious repair material with fine aggregate, poured into formwork to reinstate a concrete section..
- Integral Waterproofing Compound
An admixture dosed into the concrete or mortar mix by weight against cement content, reducing the permeability of the hardened material..
Honeycombing — questions we get asked
What does honeycombing mean in waterproofing?
Voids in hardened concrete where mortar failed to fill the spaces between coarse aggregate, usually from inadequate compaction or congested reinforcement.
Why does honeycombing matter on a real project?
It leaves a porous, weak zone that is a direct water path and offers no protection to reinforcement. In water-retaining structures it is a common source of leakage.
What do people commonly get wrong about honeycombing?
That rendering over it solves it. The void runs into the section and needs filling by injection or breaking out and reinstating.
Have a building showing this?
If a term on this page describes something you are looking at, a site inspection will tell you how far it has gone and what it needs. It costs nothing.
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