Mudsill Plate to Increase Foundation Bolt Strength and Reduce Splltting

MUDSILL PLATES INCREASE BOLT STRENGTH AND HELP PREVENT SPLITTING OF THE MUDSILL

 

This hardware was invented by Harlen Metal Products after the Northridge Earthquake to increase foundation bolt earthquake resistance.   They also reduced mudsill splitting caused by oversized holes.

Mudsills split when bolts are installed in over-sized holes.  Plate washers, which are required by the building code, help with bolt strength but not with splitting.

FOUNDATION BOLT EARTHQUAKE RESISTANCE COMPROMISED BY OVER-SIZED HOLE

Foundation bolt failure after the Northridge Earthquake from Over-Sized Holes

THIS MUDSILL SPLIT IN THE NORTHRIDGE  EARTHQUAKE AND IS THE REASON THIS SPECIAL WASHER WAS DEVELOPED.   

 

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Split Mudsill

SOFT WOOD MUDSILL WILL FAIL BEFORE MUCH HARDER CONCRETE AND BOLT. ESPECIALLY IF IT HAS OVERSIZED BOLT HOLES

 

Improved Foundation Bolt Performance with Mudsill Plates