{"id":1627,"date":"2022-04-13T22:00:00","date_gmt":"2022-04-14T02:00:00","guid":{"rendered":"https:\/\/studio.parscal.com\/?p=1627"},"modified":"2022-10-11T15:29:35","modified_gmt":"2022-10-11T19:29:35","slug":"overhead-anchors","status":"publish","type":"post","link":"https:\/\/studio.parscal.com\/overhead-anchors\/","title":{"rendered":"Overhead Anchors"},"content":{"rendered":"\n

Over the winter I’ve been mostly focused on home remodeling, but I have also been chipping away at getting the ceiling anchor system in place.<\/p>\n\n\n\n

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I plan to hang a Milos M222 Trio QuickTruss system, which at 10.8 ft x 7.5 ft weighs just over 80 pounds.<\/figcaption><\/figure>\n\n\n\n

The goal is to be able to safely suspend a triangular truss system from the ceiling to attach lights and fly speakers.<\/p>\n\n\n\n

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The design calls for 12 in. Simpson Medium Twist Straps (MTS-12) straps, made of 16 gauge galvanized steel. <\/figcaption><\/figure>\n\n\n\n

I went with a low profile design that distributes the weight as evenly as possible along all the rafters.<\/p>\n\n\n\n

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Wrapping around the member is allowed but not required to achieve the allowable load.<\/figcaption><\/figure>\n\n\n\n

I used heavy-duty metal straps, using a metal break to uniformly bend them at the right point.<\/p>\n\n\n\n

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The straps were attached with the specified #9 x 1-1\/2 in. Simpson SD screws.<\/figcaption><\/figure>\n\n\n\n

Improving on the original mocked-up design, I was able to install them so the straps aligned with each other.<\/p>\n\n\n\n

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This design supports a might higher load rating than the more common approach of driving lags into the bottom of each rafter.<\/figcaption><\/figure>\n\n\n\n

The assembly will be drywalled over, and have the appearance of an exposed beam.<\/p>\n\n\n\n

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The rafters assembly has a live load capacity of 20 psf and a dead load capacity of 20 psf. The drywall below requires less than 3 psf and the styrofoam above it less than 1 psf. This leaves plenty of remaining capacity for rigging.<\/figcaption><\/figure>\n\n\n\n

I plan to have the boards drywalled over, so I’ll be adding some OSB strips so the drywall sits away from the straps and screws.<\/p>\n\n\n\n

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I used a template to align the holes of each block and pre-drilled the screw holes to avoid splitting.<\/figcaption><\/figure>\n\n\n\n

I cut and pre-drilled backing blocks that will provide additional strength due to their grain running the opposite direction as the board they’ll be attached to.<\/p>\n\n\n\n

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The plate under and around the U-bolt increases the surface area, reducing compression of the wood fibers under load.<\/figcaption><\/figure>\n\n\n\n

I used screws to hold the blocks in place, opting for hex-heads as they are easier to drive in tight spaces.<\/p>\n\n\n\n

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The benefit of the U-bolt design is that I can install and adjust the D-rings after the drywall is on, as there’s no operable parts inside the ceiling bay.<\/figcaption><\/figure>\n\n\n\n

The anchors are evenly spaced 2 feet apart, 5 per side, centered within the room.<\/p>\n\n\n\n

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I cut the circles using a hole saw on a drill-press, aligned with the same template that was used for placing the U-bolts.<\/figcaption><\/figure>\n\n\n\n

I then added some sheathing to add clearance for the straps and screws. After the drywall goes on, the 6 inch circles will be finished off with some round flanges.<\/p>\n","protected":false},"excerpt":{"rendered":"

Over the winter I’ve been mostly focused on home remodeling, but I have also been chipping away at getting the ceiling anchor system in place. The goal is to be able to safely suspend a triangular truss system from the ceiling to attach lights and fly speakers. I went with a low profile design that […]<\/p>\n","protected":false},"author":1,"featured_media":1666,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/posts\/1627"}],"collection":[{"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/comments?post=1627"}],"version-history":[{"count":4,"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/posts\/1627\/revisions"}],"predecessor-version":[{"id":1856,"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/posts\/1627\/revisions\/1856"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/media\/1666"}],"wp:attachment":[{"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/media?parent=1627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/categories?post=1627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/studio.parscal.com\/wp-json\/wp\/v2\/tags?post=1627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}