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Scrapiron Scher posted:

Kwisor . . . . . Be sure that the framework is strong enough to support you if the access hatch is not close to the inevitable derailment. I spent four months in physical therapy after falling through benchwork on a layout.

I cringe when I read that guys/gals are using 1/2" ply or foam for their layouts.  I suppose it's great if the layouts are NEVER to be climbed on...but I always do some leaning (maybe a little crawling/maybe a little standing  ) on my layouts, so I play it safe (very safe & and no question overkill):  3/4" ply with substantial vertical posts.  There is a difference in cost - though not much - and an ounce of prevention prevents four months of PT.

Just my preference.   

1/2" plywood is plenty strong if supported correctly.

5/8" is permitted as roof sheathing supported at 24" o.c.

2x4's are permitted as rafters at spans of about six feet, depending on snow loading.

Think about most sheds that are 2x3 or 2x4 framing with 1/2" sheathing.  Strong enough to walk on for roofing installation, snow, wind...

All depends how well it is built, braced, fastened etc., although I take no exception to overbuilding things.

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
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