How can I curve boards in that way?
Curved wooden decking with integrated lighting on stairs in an outdoor setting.
 
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Ludvigjohnsson
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I guess that is some form of composite material
 
IF it is wood, it could be bentwood, meaning narrow pieces glued together.

Protte
 
That looks like a scam. Some sort of imitation of genuine plastic.

If you build a simple low-pressure steam boiler, for example from an old pressure tank or preferably from a wood-fired laundry kettle, and connect it with a coarse iron pipe to a long, narrow wooden box made of tongue-and-groove wood with a hatch at the end, you can steam-cook wood and make it relatively flexible. This process is called "bending" the wood, and the wooden box is called a "bending trough."

You bend the wood for one hour per inch of wood thickness, and then you have a few minutes to bend it and secure it with clamps before it cools. In this way, shipbuilders used to bend and shape planks up to 8 inches thick when building wooden ships in the old days. It's possible to bend such thick planks on the flat, but bending on the edge as in your picture is more difficult. One is more or less forced to laminate from narrow strips that are glued together.
 
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Joak and 1 other
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nanowire said:
I guess that is some form of composite material
I agree, it's likely plastic mixed with sawdust.
 
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JuggeH
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Google "curved composite deck" to see what can be done, it can become impressive creations.
 
prototypen said:
IF it is wood, it could be bendwood, meaning narrow pieces glued together.

Protte
Like this? Hard to believe it will age well even with waterproof glue?
https://youtu.be/sgr8j15JP2U
 
If you read Stephen's final comment, you will need many clamps and thinner lamellae, and I would have glued everything in one go, but that requires a stronger mold than what Stephen had (why stick 20 cm above the OSB board, place the blocks directly on the board)

All glued-laminated timber you see is glued, so why wouldn't it hold?

protte
 
heimlaga said:
That looks like a scam. Some kind of imitation of genuine plastic.

If you build a simple low-pressure steam boiler, for example from an old pressure tank or preferably a wood-fired wash boiler, and connect it with a large iron pipe to a long wooden box made of tongue and groove wood with a hatch on the end, you can steam wood and make it relatively flexible. This process is called steaming the wood and the wooden box is called a steaming trough.
You steam the wood for an hour per inch of wood thickness, and then you have a few minutes to bend it and clamp it with screw clamps before it cools down.
Shipbuilders used to steam and bend planks up to 8 inches thick when they built wooden ships in the past. It is possible to bend such thick planks on their flat side, but bending on the edge like in your picture is more difficult. One is more or less forced to laminate with narrow strips that are glued together.
Completely agree with you. I also prefer to steam rather than glue. But I've never had minutes, more like every second counts. I know that with steaming using ammonia instead of water, you can get significantly more flexible wood, but the method involves such great risks that unfortunately it's not recommended without a proper lab, as far as I understand.
 
nanowire said:
Like this? Hard to believe it ages well even with waterproof glue?
[link]
No problems with the right glue.
 
Daniel_N said:
No problem with the right glue.
What I was thinking of were pictures I've seen of laminated oak that, after many years outdoors, does hold together but where it's clear that it's laminated. But if the alternative is not being able to have curves at all, then that's probably the price you have to pay.
 
Oak is a type of wood that is generally difficult to glue, especially outdoors.
If you use types of wood that are easier to glue, you can even laminate frames for boats.

Danieln is right.
In carpentry contexts with small dimensions, seconds matter, but the thicker the wood, the longer it can take.
 
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