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What is the blue dye on edges of OSB boards? Question
Oriented strand boards (OSB) are often sold with a blue dye on the edges:
What is this? I'm assuming it's some kind of chemical protection. Does that mean that when you cut the board and leave an un-dyed edge, it is vulnerable to something?
1 answer
From the Georgia Pacific page on OSB:
Blue edge seal helps prevent moisture intrusion
And on the specifications page downloadable from the Georgia Pacific web page:
BlueRibbon Rated Sheathing is edge coated to limit absorption and pick-up of moisture.
Edges tend to have a much bigger issue that the big flat sides on these types of boards (OSB, plywood, etc.). They are often stored outside for an extended time at lumberyards and on job sites. However, once installed they are typically used indoors or if you used outdoors then they are covered with something else (roofing, siding, etc.), so I wouldn't be concerned about non-blue edges from cutting pieces to fit.
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