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I checked and per a Roseburg Forest Products booklet holes up to 2" are permitted as follows:

No more than 3 holes.

Square and rectangular holes are not permitted.

Does not apply for cantilevers.

Hole to be centered on height of beam.

Holes (if more than one) must be a minimum of 4" clear distance between holes.

Hole must be at least 2 1/2 times height of beam away from load bearing point

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Related Questions

Can Microlam wood be used for outside decks in New York State?

MIcrolam is very similar to lumber, but it is much stronger. it is made with the same layering technique, but has more durablilty, and requres less supporting beams. Microlam would be a great choice for a deck. MIcrolam is very similar to lumber, but it is much stronger. it is made with the same layering technique, but has more durablilty, and requres less supporting beams. Microlam would be a great choice for a deck.


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Microllam is typically sawed into 1.25 inch wide planks. These planks are made into beams that span up to 16 feet.


Can holes be drilled in a Microlam beam that is 25' long x 3 thick X 16 high?

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What is the maximum span for a 9 12 microlam used as a floor joist on 16 inch centers?

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