Compressed Wood Siding Information & Maintenance Tips:
Siding, manufactured from oriented strand board and other wood composites, have the advantage of being manufactured from relatively low cost
wood and young trees, thus saving money and attempting at a more benign impact on the environment.  Such siding products became more
attractive as traditional wood siding decreased in quality and/or increases in cost.  Unfortunately, most of the experience with such siding
products have been poor.  Many of these products have experienced moisture related problems.

Louisiana Pacific Corporation came out with Inner-Seal Siding (LP Siding).  Masonite developed Omni-Wood, and a number of other companies
launched other similar products.  Of all of these products, LP is the best known.  LP has been involved in a highly publicized legal action and has
agreed to pay for some siding damage.  Louisiana Pacific is still manufacturing compressed wood siding.  The legal action targeted the specific
Inner-Seal type.

The key issues relating to the longevity of LP and other manufactured wood siding products seem to be as follows:

  • The formulation of the materials and the manufacturing process (processes have been improved).
  • The quality of the installation with careful attention to manufacturers installation and maintenance instructions.
  • Low interior moisture levels, good venting systems, wide roof overhangs and the proper control of vegetation next to the house.

One of the problems with this type of siding is the requirement that the nail heads should not break the surface of the siding. This requirement is
intended to prevent water entry into the core of the material. Failure to follow these instructions has contributed to many of the damaged siding
installations.  If the surface is broken, water can enter causing swelling of the siding, which allows even more moisture to enter.  Edges around
windows/doors and bottom edges also prone to damage due to water entry.

If the siding is damaged, before doing anything else, it is very important to find out what if any help is available from the siding manufacturer.  
Following all of the manufacturers maintenance guidelines may be required in order to keep any warranty in force.  If the siding shows some
swelling or thin fissures at the bottom edge, it may be possible to reduce further damage by priming the siding with "Permenizer Plus" or a
similar primer and then repainting. The primer and paint may be applied with a spray gun, but the bottom edge and grooves must be brushed.
Compressed Wood Siding Information & Maintenance Tips:
after installation. Later versions have lasted longer.  The most common
conditions which seem to warrant some "preventative" maintenance are limited
swelling/nail pops and thin cracks along the bottom edge of the siding.

The following tips should promote longevity of the siding:

  • Application of quality caulk of any dimpled nail heads and other holes etc.
  • Keep the siding well painted with a quality paint. Note: brushing the
    primer and paint into the bottom edge and grooves of the siding is a
    critical element of this work.
  • Keeping vegetation, soil, roof drainage and sprinkler water off the siding.

This type of maintenance work is unlikely to solve all of the problems with this
type of siding or help with severely deteriorated material but it should prolong the
life of the product.

How long can the damaged siding be made to last? Will this maintenance work
help? Nobody yet knows, and no one will know until the siding fails completely.
But if I had some slightly damaged LP siding on my home, I would invest in this
type of maintenance work.

Note: The Information contained within this website is for informational purposes
only. I always recommend that a qualified expert be employed to fully evaluate the

HERE to see Louisiana Pacific maintenance tips.