Garage and laundry room attic flooring

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Old 11-12-13, 05:31 PM
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Garage and laundry room attic flooring

I will never use my attic for storage. Contractors need to access the attic safely. For example I will have a contractor install a range hood exhaust duct through the attic and on through the roof next spring. He needs to safely access that part of the attic. I want to install a safe, 17.5 inch wide flooring pathway through the attic. The ceiling joists are 2 x 8 inches and are 16-inch on center. If I install 4 foot-long Oriented strand board, 17.5 inches wide to cover the entire bearing surface of the ceiling joist, how thick would the OSB need to be? What would the nailing pattern be?
 
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Old 11-13-13, 03:32 AM
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3/4" OSB, CDX, or Advantech will work.
If you can get it up there cut it 8' not 4' .
Nailing pattern is not that important, the nails will just be keeping it from moving around.
 
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Old 11-13-13, 08:35 AM
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For that future day when you want to add attic insulation to what's already there, installing your sheathing gangway on appropriate-sized spacer framing will enable the insulation to be added under it. Without having to rip all the sheathing out and then reinstall it on top of spacers then.
 
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