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Nova Guynes
Rowland – I have heard the saying that Flat roofs will leak and concrete will crack, but do not know the third item.
On my part, doing commercial concrete work for over 28 years, I have used the saying “concrete will crack” many times. A general contractor asks for a guarantee that the concrete will not crack. I replied that per ACI – American Concrete Institute, concrete will crack. I said we do minimize cracking by using different additives or when pouring a slab on a windy day, covering the slab with poly to keep it from drying too fast. When concrete walls crack, we inject the crack with epoxy to seal the crack, which is acceptable.
In general, when it comes to slabs, where cracks are more noticeable, both ACI 302.1R-15 and ACI 360R-10 state in their prefaces that it’s unrealistic to expect crack-free and curl-free floors regardless of the best design and construction practices. Also, those documents state that the designer and contractor need to advise every owner that “it is normal to expect some amount of cracking and curling on every project.” ASCC Position Statement #33 provides similar guidance, stating that:
This is probably too much information, but it is what I do.
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