LP siding was predisposed to fungus growth from its initial manufacturing. The wood used in the siding itself was developed with a dormant fungus already living within it. It is also nearly impossible to completely seal LP siding at the time of installation. Because of this, water is able to “wick” around the edges and under the bottom of LP siding into the unsealed wood – causing it to become moist and often waterlogged. Warm weather (or even a warm interior temperature) activates the growth of the dormant fungus already in the wood. As the fungus grows, it forces the LP siding apart, creates delamination, and even attacks nails and studs. If left untreated, mushrooms will begin to grow on the siding. If this happens, the damage to your siding is very serious and in need of immediate replacement.

First, you’ll need to decide if you want to tear off your LP siding or leave it on. Full LP siding removal is the best way to ensure complete eradication of and fungus. You should always remove lap or board siding – since this siding is most likely to damage the substructures of your home. However, if you have 4 x 8 sheets of LP siding – leave them on. The affected sections (usually the bottoms) will need to be cut off and replaced and the substructure should be treated with a fungicide to prevent future growth. We make sure to treat your home with a fungicide regardless of if you choose to fully or partially replace your LP siding. We’ll also properly seal your home before any new installations to provide additional protection against air and water infiltration.

Many upset homeowners filed claims to have their LP Siding replaced, but never received replacement siding or any assistance from Louisiana Pacific itself. This led to a class action lawsuit against Louisiana Pacific, which resulted in a $25 million settlement. If you have LP Siding on your home and have not settled, you can still file a warranty claim. However, you must not replace your siding before filing. Our siding experts will help walk you through the claims process and make sure you get the replacement siding you’re entitled to!