Steven L. Smith, Bellingham, WA Home Inspector (King of the House)

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L-P Siding Failure (Bellingham Home Inspector) King of the House

In the 1980's and up to 1995, and even after that,  Louisiana Pacific (L-P) innerseal siding was popular with builders. That was, especially so, true in my corner of the Pacific Northwest.

L-P siding is still available and, whether or not the new variation of the product is much of an improvement over vintage innerseal is up in the air. I see plenty of delamination and decay at newer oriented strand board or OSB sidings such as L-P.

We do know that some problems with the siding involve installation errors but, also, the L-P innerseal product, due to durability issues, was subject to a class action lawsuit. Typical problems with L-P cladding include swelling, fungal growth, delamination, decay, cracking and buckling.  When siding ends up in the condition shown in photos below, all you can do is replace it and hope that sheathing behind the material is not too messed up. If sheathing is damaged, replacement costs will go even higher.

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L-P knot, distinctive, on innerseal siding
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L-P knot defined. L is blue. P is red

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Siding failure -crumbling (two examples)                                             

 


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Steven L. Smith

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Comment balloon 3 commentsSteven L. Smith • June 09 2014 08:24AM
L-P Siding Failure (Bellingham Home Inspector) King of the House
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In the 1980's and up to 1995, and even after that, Louisiana Pacific (L-P) innerseal siding was popular with builders. That was, especially so, true in my corner of the Pacific Northwest. L-P siding is still available and, whether or not the… more