I found a very interesting video by Tom Campbell. It is unbelievable how much damage termites can do! Severe Termite Damage: Joists and Sills It is very important to inspect your crawlspace at least once a year for moisture and termite infestation. If you do not want to go under your house make sure you have a very reliable Pest Control Company. Call us if you need a referral to a reliable Pest Control Company in your area.