Welcome to our Links section. We hope you find these very useful. APA The Engineered Wood AssociationAssociated Builders and ContractorsAssociation of the Wall and Ceiling IndustriesBuilding Officials & Code Administrators InternationalCanadian Wood CouncilHardwood Plywood & Veneer AssociationInsulation Contractors of AmericaNational Association of Home Builders (NAHB)National Association of Remodeling Industry(NARI)National Paint & Coatings Association OSHA (Occupational Health & Safety Adm.)Southern Pine CouncilU.S. Census Bureau (Construction Statistics)U.S. Department of Housing & Urban DevelopmentWestern Wood Products AssociationWood Moulding & Millwork Producers AssociationThe Journal of Light Construction MagazineBlue Linx CompanyCalculators Span Calculations