Breaking stuff - the home reno thread


If you ask a builder to build something to a certain standard (a concrete slab in this scenario) and the trades they get to do the job deliver something not to the required standard (slab not hard enough, and not suitable for polishing).

Are trades people covered by insurance for mistakes their sub contractors or suppliers make?

The thing has to be pulled out. But I want to know if they just cop it in the neck, or they are covered to some degree.

They should have builders insurance, yes. If they’re a registered builder.

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Yeah, they’ve mentioned it, and they are legit.

It really sucks, but someone’s farked up the job, and it’s going to be more expensive than doing it night the first time.

Usually is.

Everyone will be pointing fingers , and the first port of call will be which MPa rating was ordered, and what was actually delivered.

Concrete Company sells decorative range starting at 32 MPA
Polisher says they recommend at least 32 MPA to get the desired look
Ordered 32 MPA
Receipt from concrete company says 32 MPA

Got delivered and put down. First cut (4-6 weeks later) by the grinder looks like ■■■■ with thousands of air pockets from 1-50mm. You can pick stones out of the air bubbles.

Work stops. Everyone scratching heads, fingers begin pointing. Weather, sun, too much water, too much vibration, not enough vibration….

Core samples tested in a lab says it’s 22MPA and ‘slab surface is of poor quality and not suitable for polishing’

It’s structurally sound, but not what we asked for.

As long as they’re insured, I don’t feel as bad as them being out of pocket. It’s also got heating and insulation in it, so it’s all or nothing…

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Is the decorative concrete laid over a structural slab, or is the decorative concrete also the structural slab?

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It’s one slab poured at the same time.

The slab is structurally sound and could be ‘fixed’ to an extent or suitable for covering with timber flooring etc.

Could be a number reasons, but the most likely honeycombing culprit is lack of vibration. Not enough slump (water added to mix when concrete is poured) and the concrete curing too fast due to hot weather could also be reasons.