Archive for June, 2010

Bad Foundation BoltTRUE: All legally permitted houses built after 1936 in the City of Los Angeles and most surrounding cities are “bolted” to their foundations.

FALSE:  Those bolts are in the same condition now as they were when installed…

Having crawled under 1,000’s of houses and seeing many interesting sights during those “adventures”, above is a photo of something that we see all too often. This is one of a series of failed anchor bolts in a “bolted” house built in the late 1930’s.

There are several key points in the photo. First, and most obvious, the rusted anchor bolt was removed by simply lifting it out of the piece of wood that was originally anchoring it down to the foundation. No tools required, it just came right out. Secondly, notice the chunks of concrete lying in the dirt below. This is the cracked foundation created by the expansive pressure of the rusting metal over time. Why? Water coming through from the exterior over time.  Next you’ll notice the white chalkiness on the concrete, this is the mineral deposits that water has pulled out of the concrete foundation, further weakening it.  On the ground you can see the metal shards that once formed a perfectly good steel anchor bolt.

If you’re not sure of the status of what’s holding your house down, we can come out and perform a fast, honest, and accurate evaluation of your foundation system and can tailor a prescription to bring your home up to current standards seismically.