Questions, answers and advice for people who own or work on houses built during the 20th century.
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I have a 1916 house with field stone, pebble, concrete mixed foundation. We recently had the interior of the foundation spray foamed and the exterior walls skim coated with a concrete type mix. We also had interior drain tile installed. Now, about one year later the spray foam around the windows is pushing inward (away from foundation wall) and the exterior skim coat is pushing outward(away from foundation wall). The skim coat guy came to 're-do' the exterior skim coat and found that the foundation has turned to sand.. and is damp. How did this happen and why? I've had numerous guys out in different professions and they are all stumped (contract, concrete, structural engineers, etc). please help, thanks!