Masonry block wall: To seal or not to seal?
In preparation to insulating my renovation of a 1970s building’s masonry block wall with 2″ XPS foam board attached directly to the masonry block, should I paint the interior masonry block wall with a sealer like DRYLOK¯ Masonry Waterproofer or KILZ 2¯ LATEX Low VOC?
Right now there is a thin coat of cheap latex paint on the block wall.
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