concrete garage sub base


Postby bobho1 » Thu Oct 11, 2007 8:57 pm

I'm replacing a concrete garage base, after digging up the original concrete, the base under is constructed of red ash. Is red ash a suitable material to lay concrete on or does it react with the concrete and cause cracking ?.
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Postby tradeaway » Sun Oct 21, 2007 6:07 pm

red ash or 'red death' as it has come to be known, is sulphate rich and reacts with concrete causing it to expand and bow away from the ash.

i would dig it up, or at least use a gas dpm if you are going to leave it down.
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Postby dents » Fri Nov 02, 2007 12:59 am

just lay a dpm
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