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enter image description hereI want to build Shoji screen door and need to set a frame from lumber pine to hold the door. Door width 5.5 meters(18 feet), height 2.5 meters (8.1 feet) Between the left and right lumbers(blue ones) is a wall(concrete), above the upper lumber(Yellow) is air (the height of the room is 3.75 meters), the upper only supported by the left and right lumbers(blue ones). I do have 6 meters long lumbers with 10x10cm or 15x15cm or 20x20cm or 25x25cm. It's inside the house(above the yellow air, above the air roof, no snow :)), the only purpose of this construction is to hold the Shoji screen sliding doors. The lumber is pieces of glued pine. So, what is the lumber thinkness should I use? 10, 15, 20, 25 cm? Thank u all, and sorry for lake of explanation.

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  • Hi, welcome to StackExchange. If you're essentially just building a doorframe I don't think you need to go beyond what the dimensions that are commonly used for that purpose in your home. If the requirement is a little more specific than that you'll need to provide more detail. In case you don't realise, buying stuff in the needed lengths could pose some difficulty! 2.5m should be no problem, but if you intend to span the full 5.5m without joints that may require a special order, and could work out very expensive.
    – Graphus
    Feb 6 at 11:50
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    Could you be more specific about what you mean by a "frame"? If what you are referring to is a structural frame to support the wall above, then we would need more information regarding the building construction. Even then we might defer with a recommendation that a structural engineer guide you. If you are referring to the facing face trim in the opening, then standard thickness boards should work. Could you add a sketch of what you are planning to do and what you need sized?
    – Ashlar
    Feb 6 at 14:53
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    Assume you are asking a colleague who knows nothing about what "Shoji" is, but you want their advice on carpentry. Edit the question to tell us briefly what it is you want to do and what part of your plan you need assistance with. A quick sketch can help you, and us, understand what it is you are doing.
    – user5572
    Feb 6 at 15:02
  • This question might be more at home at diy.stackexchange.com. Have you looked there for similar questions and answers?
    – gnicko
    Feb 6 at 15:21
  • When you edit the question, please describe the exact dimensions of the panels. Feb 8 at 1:34

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Since it is not a load bearing opening, and all it needs to do is hold the doors up a much smaller header would be required. it is still a long gap to span and the doors will have some weight. the 15x15 would probably do fine, but I would recommend bumping it up to the 20x20, and going with the 25x25 you certainly wouldn't be unhappy with that.

To recap, I think the 15x15 might just pass muster, at least for a little while but since you have bigger options ready, I would go with one of them.

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