Posted by ss55 on March 01, 2013 at 11:40:21 from (173.31.19.80):
In Reply to: help locating rafters posted by Tuckermac on March 01, 2013 at 05:29:13:
Zircon makes some handy little electronic stud finders. I've had one for about 20 years now, it was $10-$20 back then. It finds the ouside edges of the studs/rafters. I mark the edges on a piece of masking tape or a wide Post-It-Note so there are no permanent marks left behind.
Rafters are designed to support distributed loads, say 50 pounds per square foot over the whole roof. Concentrated loads require extra bracing. If adults use the swing the maximum load on your hooks could be between 150 to 250 pounds per hook with a 50 pound side load when it swings. To spread the load between 3 or 5 rafters, consider installing 2x4 or 2x6 braces to the bottom side of your plywood ceiling. Fasten the braces through the plywood into all the rafters with deck screws, dry wall screws are brittle and can snap. Still fasten the hooks into the center of a rafter.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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