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The above chart indicates the different types of support systems found, the number that performed without failure, and, the number that failed as a result of Loma Prieta earthquake forces.
A clear result of the evaluation of performance from the different types of manufactured home support systems is that there are substantial differences. It is also clear that the prior observance by Division inspectors in smaller earthquakes that concrete block support systems performed better than others can be statistically proven.
Additionally, we have observed the performance of HCD Certified Earthquake Resistant Bracing Systems (ERBS) for the first time under more than theoretical conditions. These systems do the job that they were designed to do. It was observed by inspectors that the homes equipped with HCD Certified ERBS sustained considerably less damage than the non-certified systems although both types of systems performed adequately. This observance could not be documented by repair bills, etc., it was simply an observance.
While this report does not reflect or represent a position of the Department of Housing and Community Development on the adequacy of support systems currently approved for manufactured homes, it certainly serves as the basis for consideration of changes to our regulations.
The Department will, in the Summer of 1990, hold "Fact Finding" Hearings to gather input from the public and industry concerning the adequacy of our current regulations for the support of manufactured homes. The dates, times and places of these hearings will be announced.
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