No lateral support (bracing) to piles
Listed under: earthquakes, Subfloor, bracing, framing, piles
Cause
Bracing was not installed (even if a house has been repiled) – typical in older houses
Repair
- provide lateral bracing support to the piles. Fix timber braces at a slope no more than 45° – flatter slopes are better (see drawings). Connect each brace to framing parallel with it, i.e. pile to bearer or pile to joist. Sheet bracing (treated plywood or fibre-cement) can also be used so long as it does not reduce subfloor ventilation.
- you can find more details about subfloor bracing here, and you can find information about retrofitting subfloor bracing for houses on hillsides here.
Cause
Earthquake damage to existing bracing
Repair
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carefully check the state of all the subfloor structure including fixings. Depending on the severity of the earthquake and scope of the damage you may need to call in a chartered professional engineer to advise
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repair or replace any split or otherwise damaged lateral bracing support to the piles. Fix timber braces at a slope no more than 45° – flatter slopes are better (see drawings). Connect each brace to framing parallel with it, i.e. pile to bearer or pile to joist. Sheet bracing (treated plywood or fibre-cement) can also be used so long as it does not reduce subfloor ventilation.
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you can find more details about subfloor bracing here, and you can find information about retrofitting subfloor bracing for houses on hillsides here.