The photos below are the result of an error made by a contractor. I was inside a crawl space the other day. Rest of the home looked fine. I never would have suspected this, but the slab in this crawl space had significant water present. That is not only bad for structural wood but, also, that moisture ends up inside the home. I called for a drainage specialist. This is not sump pump issue, they need to find out what is causing this.
The drainage guys ran hoses, crawled around under there and found out that the problem was the result of damage to a drain line when an improvement was made to the home. A drain line from the gutters was cut when a new slab was put in at the porch. Running water in gutters allowed the runoff to intrude into the crawl space. Not exactly sure how they will deal with it, since the damaged line is under the new aggregate slab, but one thing is certain, the crawl space cannot be a receptacle for rain water.
Steven L. Smith
Bellingham WA Home Inspections