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Blackout curtains have always disappointed me because they let in far too much light. Both through the fabric itself, and around the edges.

I would like to create a window covering for my bedroom that doesn't allow any light through. Such that I can't differentiate the window from the rest of the wall when it's covered and the room is dark.

My best idea currently is to use plywood and flush mount them with a silicone or rubber lining around the edges to further seal it. They'd open/close like this:

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But I'm worried about the weight of the plywood making it unwieldy to open, and dangerous should it fall. I'm also unsure of the thickness I'd need the plywood to be to both be stable and properly block the light.

Does anyone have ideas for a better material?

An answer to a similar question suggested rigid foam, but I'm pretty sure that foam wouldn't be stable enough for years of use.

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    Rigid building foam not mattress stuff... – Solar Mike Feb 8 at 22:36
  • Rigid foam cut to size works, also aluminum foil taped to the window works really well, the problem with foil is when you open a slider there is a seal strip that tears the foil on the non moving side. – Ed Beal Feb 8 at 23:55
  • Hello, and welcome to Home Improvement. If an answer is helpful, please click the large check mark next to it to accept. And, please take our tour so you'll know how best to participate here. – Daniel Griscom Feb 9 at 19:34
  • foamcore presentation boards, a gluestick, and aluminum foil can replace your plywood. you figure out the rest. – dandavis Feb 9 at 20:54
  • I called out rigid foam as an unacceptable material in my question text. – johncs Feb 9 at 21:58
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Interior storm window + can of spray paint? The benefit here is to get something perfectly sized for your window, and designed to be removable. There will be no weight issues, due to the use of plexiglass. (If you want to make it yourself, looking up interior storm windows would still be useful, as they're something designed to fit in a window, completely filling the space.)

You can install a blackout cellular blind that fits into grooves on the sides. Bit expensive, but it has a nice professional appearance.

You can use Command Adhesive velcro strips to hold the sides of a regular blackout blind to the wall to decrease the light leakage around the edges.

You can make your own blinds with blackout fabric and a sewing machine. This lets you select very good blackout fabric, and double it up.

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  • I'm unsure about using plexiglass but you've got me thinking of plastics in general now. I'll accept this as the answer if I end up going with a plastic, gonna be working on this project this coming week. – johncs Feb 9 at 22:05

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