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sheathing paper[′shēth·iŋ ‚pā·pər]
A paper that is heavier and of better quality than the usual building paper.
A heavy, relatively cheap, durable paper, such as asphalt paper, used in building construction, esp. in frame construction, to improve thermal insulation and weather protection and to act as a vapor barrier. Special types are: sheathing paper, used between sheathing and siding; floor lining paper, used between rough and finish floors.