LAR-CON BUILDERS
LAR-CON BUILDERS
| 515-382-6019 |
| A Closer Look...continued |
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Materials
Only the highest quality building materials are used for the Permanent Wood Foundation.
Plywood must meet the strict requirements of U.S. Product Standard PS 1-83 for Construction
and Industrial Plywood. Lumber must be of a species for which allowable unit stresses are
given in the "National Design Specification for Wood Construction" and must be
grade-marked by an approved inspection agency. And both plywood and lumber must be
pressure-treated in accordance with the penetration, retention and drying requirements of
the American Wood Preservers Bureau AWPB-FDN Standard. Required preservative
retention is 50 percent higher than codes require for normal ground contact application.
Structural and Durablility Analyses
The Permanent Wood Foundation is the result of extensive design and engineering analyses
by the U.S. Department of Agriculture Forest Service, the National Forest Products
Association, and the National Association of Home Builders Research Foundation.
Additional in-ground structural testing has been conducted by the American Plywood
Association. Durability of the system was demonstrated in long-term tests conducted by the
Forest Service. Pressure-preservative-treated wood in these tests has withstood severe
decay and termite conditions with treatment levels lower than required by the AWPB standard
for Permanent Wood Foundations.
Only the highest quality building materials are used for the Permanent Wood Foundation.
Plywood must meet the strict requirements of U.S. Product Standard PS 1-83 for Construction
and Industrial Plywood. Lumber must be of a species for which allowable unit stresses are
given in the "National Design Specification for Wood Construction" and must be
grade-marked by an approved inspection agency. And both plywood and lumber must be
pressure-treated in accordance with the penetration, retention and drying requirements of
the American Wood Preservers Bureau AWPB-FDN Standard. Required preservative
retention is 50 percent higher than codes require for normal ground contact application.
Structural and Durablility Analyses
The Permanent Wood Foundation is the result of extensive design and engineering analyses
by the U.S. Department of Agriculture Forest Service, the National Forest Products
Association, and the National Association of Home Builders Research Foundation.
Additional in-ground structural testing has been conducted by the American Plywood
Association. Durability of the system was demonstrated in long-term tests conducted by the
Forest Service. Pressure-preservative-treated wood in these tests has withstood severe
decay and termite conditions with treatment levels lower than required by the AWPB standard
for Permanent Wood Foundations.
Inc.
805 Lincoln Hwy. - Nevada, IA 50201