Crushed concrete or crushed Granite Type 1

14 Nov 2011
Reaction score
United Kingdom
Evening All,

Im about to lay 150mm of hardcore for our extension floor base and have been asked if I need Crushed concrete Type 1 or Crushed Granite Type 1, this is then to have a sand binding over the top before dpm and concrete oversite is poured. Which one is the one to use or are both suitable?

Thanks in advance
Sponsored Links
concrete. and for blinding i’d use 6mm to dust or dust . sand is too fine.
What about insulation?
The plans state 150mm sand blinded hardcore, dpm then 100mm concrete, dpm 100mm Insulation underfloor heating pipes and then screed
Can you be assured that the crushed concrete is not contaminated? If so it will be OK

Blinding should always be sand - building or similar loamy sand, not sharp.
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local