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National Lumber knows that architects make material specifications for important reasons. Quality matters to the long-term success of your work.

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Once you and your clients see the results of having National Lumber for your building materials supplier, you'll never want to go anywhere else.

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PDF of Wall Construction-Insulation Comparison IMPORTANT: Wall Construction/Insulation Comparison New code requirement is R-19 wall cavity insulation in the 7th Edition Building Code as being implemented in most areas of Massachusetts on July 1, 2010.