Blockers!
What is the Deal with Houses Built From Concrete Blocks? Identification Concrete Masonry Block [CMU] Construction is easily identified as the perimeter walls are built from concrete blocks. Sometimes when the exterior is covered by siding and the interior is covered by wallboard, you cannot see the blocks. In these cases try looking at the jamb extensions of the windows and doors. A masonry block house will have thick jamb extensions at windows and doors as they need to cover...
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