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What Causes LP Siding Problems
It is nearly impossible to completely seal LP siding at the time of installation. Water is therefore able to “wick” around the edges and up under the bottom of the laps of the siding. That water then soaks into the unsealed portions of the wood, causing it to become moist and often waterlogged. Warm weather, or even a warm house interior, then creates perfect growing conditions for fungus that had been dormant inside the siding (this fungus was ground up into the wood product during manufacturing). As the fungus grows, it forces the LP siding apart, causes delamination, and even travels down nails into studs and substructures. If left untreated, the mushrooms start to grow. By the time these mushrooms appear the damage is already very serious.
Many upset homeowners filed claims to have their bad LP Siding replaced, but never received replacement siding or any help from Louisiana Pacific. This led to a class action lawsuit against Louisiana Pacific in which the company agreed to a settlement of $25 million dollars.
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