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I recently replaced the carpet in my attic with a floating mdf backed engineered hardwood floor. the attic has a circular opening in the floor for a spiral staircase.

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The face of the opening is 3/8" plywood. My question is: How do I trim the curved edge between the floor and the opening face?

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I haven't been able to find a product designed for this purpose at the local hardware store or in a Google search. Something made of wood would be ideal, but that seems impractical. Probably something made of a flexible material would be an easier option. If anyone has any ideas I would greatly appreciate it. Thanks in advance

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    Your search didn't come up with product lines like this? A combination of their stair nosing and T-molding would probably do well. Unfortunately you'd normally work out transitions before laying the floor to allow the proper clearance. You might need to cut in place.
    – isherwood
    Commented Nov 22, 2019 at 19:34

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I would make a polygon (24 - 1/2x2 cut at 82.5 degrees + wood glue + a lap joint for strength) that can then be cut into a circle and maybe routed with a detail. You would see the grain changes in direction, but that wouldn't be a deal breaker to me. It would be a bit time consuming with all the cuts and glue up.

I've also seen videos of people using PVC trim and a clothes iron to bend long thin strips and it seems to work very well, but I've never tried it.

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  • You may get the vertcal piece to bend just fine, and can probably even use a single strip of thin wood, but the horizonal section of trim wouldn't bend unless it's very thin. This cut out method is what I was thinking.
    – JPhi1618
    Commented Nov 22, 2019 at 19:25
  • it're fairly easy to convert a plunge router into a compass (flip the edge guide upside down and screw it to an arm)
    – Jasen
    Commented Nov 22, 2019 at 20:36

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