On a rainy day:
Go outside and make sure the water is being directed far enough away from the house
-add gutters and downspouts (if there are none)
-make sure they are in good condition (no leaks) and gutters are properly sloped
-make sure gutters are cleaned out
-make sure downspouts extend at least 4 feet from the foundation
-make sure the grading slopes down and away from the house
-seal up any gaps around windows and any pipes/conduit that enter the house
Go into the attic and look for leaks, especially around chimneys, vent pipes and roof vents
Go into the basement and look for water penetration
-seal up any foundation cracks with hydraulic cement
-if water penetration persists, you may have to install a sump pump (make sure it
has a battery backup system) or a french drainage system
Go into the crawl space (if possible) and look for water penetration, as well (btw, if itís a dirt floor, pour a concrete floor, if possible. If not, at least put plastic sheeting down 6 mil thick over the dirt floor, overlap and tape each piece and make sure the crawl space is properly ventilated).
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