I need to build a metal shed about 10' high and 6x6 in floor space which must be able to withstand 175 MPH winds.

How can I make sure that the shed and its anchors can hold up under those conditions?

  • Are you looking to buy a kit or roll your own design? In the case of the latter, I'm pretty sure you're looking at getting a structural engineer to certify the structure for hurricane loads – Hari Ganti Feb 22 '18 at 21:09
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    I don't know a lot about this, but I found this site where you can search for approved shed plans in Florida. Search here and you can find full blueprints of shed designs that come with wind ratings, and it's Florida, so they see their fair share of actual hurricanes. – JPhi1618 Feb 22 '18 at 21:18
  • The answer is going to depend on your design. As it is, the question is too broad. – isherwood Feb 22 '18 at 21:23
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    Wow only 6x6 and 10 feet tall, that is going to have one heck of a frame work and a really thick pad or deep pileings that the frame work attaches to. Makes me think of a telephone pole and think how many of those get broken off , – Ed Beal Feb 22 '18 at 21:42
  • Seriously, is earth sheltered construction out of the question? – Harper - Reinstate Monica Feb 23 '18 at 0:46

I can think of two options that should work...

Shipping Container

A steel shipping container should be more than strong enough to meet hurricane ratings, and come in just about any size.

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This company sells anchors that it claims should withstand strong winds & hurricanes, though they "have not been scientifically tested." They're basically big triangles of metal or long screws driven into the ground:

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Monolithic Dome (shed sized)

A dome constructed of rebar, foam & concrete/shotcrete. They're very very resistant to winds (probably tornadoes too), and the weight combined with a cement slab & footing should make sure the whole thing won't blow away, ever. See Wikipedia or Inhabitat.com

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Alibaba has a larger one, with images too:

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For more conventional construction, if your neighbourhood/city has hurricane requirements then they must have guidelines on how to meet them, especially for usually DIY-friendly sheds. Check with them first.

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I'm not an expert about coastal or island wind zones (mostly just the normal tornado/high wind stuff), but I can tell you that having a continuous load path and paying attention to uplift are important.

Having a continuous load path means that you transfer all vertical and lateral loads from the wood structure down to the foundation, usually by using hangers and/or fasteners to make the connections. This means that fastener & hanger manufacturers should have many of the resources you're looking for.

Simpson Strong-Tie (a fastener and hanger manufacturer) have a lot of stuff that might help if you're willing to teach yourself. They have a homeowner focused website, as well as a PDF for builders.

The main idea is to make sure that no matter what the wind does (push/pull/twists/racks) to the wood structure, that the structure will be able to use the foundation to resist those forces.

It's easy to overbuild your shed using a metal connector at every point, and that is what Simpson wants you to do. You would need an engineer to tell you which of these steps don't need a metal connector and where nails would be sufficient based on your specific location and exposure category:

  1. Connect your bottom sill plate to your foundation, and your studs to the bottom sill plate.
  2. Connect your top plate to your studs.
  3. Connect your rafters/trusses to your top plate.

Connect your bottom sill plate to your foundation, and your studs to the bottom sill plate. Connect your top plate to your studs. Connect your rafters/trusses to your top plate.

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