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Re. Crawlspace: Other issues: (1) Sewer pipe not properly sloped - actually looks bowed. (2) copper shouldn't be bent like that and it will freeze here in the northeast with that vent open and it going directly outside. (3) wires need to be through the floor joists if less than #8 gauge. (4) doesn't look like there is a sill gasket.(5) The vent would be ok if it had louvers to open and close paired with a fan. The lovers would and the fan blow outside when the humidity were higher inside and close when the humidity is higher outside. Of course this means the air pressure would need to be balanced somehow - i.e. a real HVAC design would need to be done - obviously not the case here. (6) Brick issue: can't see from the pic, but the mortar joints need to be raked properly to shed water. I wouldn't use brick as part of the foundation - too prone to early failure. I prefer full concrete and add a veneer for aesthetics.
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