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The Owens Corning MP40 is a small unfaced fiberglass roll, 16 in. wide, 48 in. long and 2 in. thick, covering about 5.33 sq ft. It is meant for patching and filling: gaps around outlet boxes, window and door frames, and other tight spots where a full batt will not fit. It is unfaced, so it has no vapor barrier and needs a separate one on exterior walls. Against full batts and blown-in insulation, it wins on convenience for small jobs but covers far less area.
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The Owens Corning MP40 Multi-Purpose Roll is an unfaced fiberglass insulation roll for small insulation projects. It provides thermal and acoustic performance.
The roll can be cut to size for precise application. It is used to fill gaps around outlet boxes, windows, doors and other tight spaces.
