Preventing Damage to Home Additions

The building code does have any guidelines about how best to attach an addition to the main house.  How this connection is made is left up to the contractor. Contractors will put in enough nails to make sure the  addition does not fall down from gravity, but will rarely check  to see if the addition will separate from the main house in an earthquake.  Because they have no code to follow, so the building inspector will pass anything that looks reasonably effective in keeping gravity from separating the two.

 

Earthquake pushing home addition away from main house

                                        EARTHQUAKE PUSHING HOME ADDITION AWAY FROM MAIN HOUSE

Floor to Floor Connectors

The purpose of Floor to Floor Connectors is to make sure these two floors do not separate.  Floor to Floor can be made of steel bolts, large screws, special hardware known as Hold Downs, or custom made wood connectors designed on site as circumstances require.

Hardware used to prevent earthquakes from pushing addition off of main house

HARDWARE TO PREVENT EARTHQUAKES FROM PUSHING ADDITION AWAY FROM MAIN HOUSE