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Seismic Retrofitting

Seismic Retrofitting

Soft Story Retrtofit

Do You Need Earthquake Retrofitting? You Do If You Have a Soft-Story Building.

Soft-story buildings are multi-story buildings characterized by a ground floor or lower floors that are significantly "less stiff" (thus they're called "soft stories") than the upper floors they support. In a soft-story building, the lower levels do not have enough shear walls or other elements (e.g. steel frames) to help the structure withstand lateral (side-to-side) earthquake movements. Earthquake Retrofitting is needed.

Examples of soft stories:

  • Ground or lower floors that have been turned into tuck-under parking without appropriate reinforcements. Tuck-under parking lots, by their very nature, have large open spaces with minimal divisions. Thus, tuck-under parking floors could have an insufficient number of load-bearing walls.

  • Ground or lower floors turned into office floors, where individual offices are divided by glass partitions.

  • Ground or lower floors with sweeping, floor-to-ceiling glass windows.

Request a soft-story inspection.

Do You Need a Soft-Story Retrofit?

According to a Caltech survey, there are more than 19,000 soft-story buildings in Los Angeles in need of soft-story retrofitting / earthquake retrofitting. If you own an old, multi-story residential or commercial building, your property might need a soft-story retrofit to make your building earthquake safe.

Why Retrofit Soft Stories? Why Do It Now?

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Soft stories are an earthquake hazard and they could lead to a very substantial loss of investment, profit and lives. If the sideways movement during an earthquake is particularly strong, the weak supports in the soft stories could give way. This, in turn, would cause the upper floors to fall onto the lower floors, thereby crushing whatever or whoever is on those lower levels. This type of structural failure is known as "pancake collapse."

The risk of soft-story-induced pancake collapse during an earthquake became glaringly obvious when the 6.7-magnitude earthquake struck Northridge in 1994. At that time, more than 20,000 soft-story buildings were gravely damaged or went down like a house of cards and 33 persons lost their lives.


If your building has soft stories, get it earthquake retrofitted as soon as possible.The following are some of the reasons why prompt action is advised:

Minimize liability losses.

You could be liable for damages worth millions of dollars if your soft story building collapses during an earthquake and causes injury or death to tenants or innocent bystanders. This has already happened in Paso Robles, where the jury awarded almost $2 million in damages to the families of 2 women killed in a soft story collapse during an earthquake in 2003.

Earthquake scientists predict that there is a 99.9% chance of a 7-magnitude quake hitting Los Angeles in the next decade or so. If this earthquake strikes before you've had a chance to retrofit your residential or commercial building, many lives could be lost and massive property damage could result. Since Los Angeles codes state that building owners are liable for any loss of life and damage to property within their buildings, you could end up facing enormous liability losses.

One may argue, of course, that insurance exists to protect a building owner from liability in case his or her building collapses during an earthquake and injures people and damages tenants' property. Even so, doesn't it make sense to retrofit and thus prevent major losses instead of simply waiting for the worst and then relying on insurance to make things right?

In the midst of post-earthquake chaos, with building owners clamoring for insurance coverage right after the quake, you'd be very glad you decided to retrofit.

Save money

It's generally less expensive to retrofit (and thus prevent damage due to an earthquake) than to repair earthquake damage. Save money by having a soft-story retrofit done before the next earthquake.

Lower earthquake insurance premiums

If you earthquake retrofit your soft-story building, the lower your earthquake insurance premiums are likely to be. Your earthquake insurance underwriter will probably decide you have low potential exposure (i.e. that you're a low-risk client) because your building has been reinforced to protect it from earthquake damage.

Save on interest

A loan taken out on a soft-story building is likely to have a higher interest rate than a loan taken out on a properly reinforced building. The logic is simple. Structurally sound buildings make good collateral, while structurally weak ones pose a great risk to the lender. What if an earthquake demolishes or seriously damages the building before the loan is paid off? The lender will be left with a worthless (or nearly worthless) piece of property as security.

Attract tenants

Building owners are required by law to disclose their buildings' seismic vulnerability to prospective tenants — so if you don't retrofit, you could scare tenants away. On the other hand, if you retrofit, the fact that your building has been earthquake retrofitted may be used as an additional marketing/selling point. You could also command higher rent prices.

In the end, it's all about ROI.

According to Caltech's survey, the benefit-to-cost ratio of a soft story retrofit could be as much as 7:1 — and since there's a 99% probability of a big quake hitting Los Angeles in the next 10 years you'll sleep better knowing your building is safe.

Thank you very much for all the hard work you have done these past several weeks to make our home's foundation & den ceiling more structurally safe & sound! We truly appreciate your efforts in doing a thorough job as well as accommodating the extra things we've requested along the way.

Sincerely, The Valdez Family, Los Angeles

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