PRACTICAL Greenhouse Advice/ cinder block foundations and walls

Tim Eck via pbs pbs@lists.pacificbulbsociety.net
Sat, 09 Jan 2021 18:16:03 PST
"I plan on sealing the exterior side of the wall this summer to see if that
will help ameliorate the problem."

I would recommend Thompson's Water Seal for masonry on the inside.  You can
apply it with a cheap tank sprayer but you may need to pressure wash it
first if it has scummed up.
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