Just recently my husband and I noticed a horizontal crack about half-way through the walls of our home. Almost every wall in the house has the same crack in it. There are a few exceptions,.. but it is definitely there throughout most of the house. The house was built in 1967 and I am assuming that it is drywall. We are on a concrete foundation in the Mojave Desert of California. No basement. We have lived in the home for about 6 years and it just appeared recently. We have been pondering the possible causes and have come up with,.. 1) we recently installed a Swamp Cooler (evaporative cooler)to cut our electric bill from the A/C unit. Possibly the added moisture in the air caused the crack? Or, 2) The Army base nearby doing desert warfare training sometimes uses explosives and we have a lot of loud "booms". It is a hairline crack. Any ideas?? And what about repairs?
Thanks, Laurie