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pier concrete observatory floor concrete isolation foam, what to use?
Hello,
When the floor for an observatory was cast the around the pier concrete (Beginners pier complete thread) it was surrounded by 20 mm thick boards. These boards have been removed leaving a 20 mm wide slot as deep as the depth of the floor casting,
My question is, would spray in expanding foam in the slot be too rigid when it sets? If so, what density of foam should be used?
Cheers
Chris
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