Flexible/round concrete form material

[4EyedTurd]

The goal: 8 roundish concrete tree edgings

What material could I use to for a circle frame with about a 30” ID and another circle that’s about 35”? I looked at MDF bender board but doesn’t seem flexible enough to make that curve. I picked up some flashing and even with stakes it’s way to flimsy. I gave up trying to find the curved scallop edge stones and decided I’d get the kids involved to help decorate the concrete. Making memories, ya know.

I’m not shooting for perfect, I’m going for maximum fun level. First one is done and daughter still has lots of glitter

 

[PCustoms]

Thin plywood?

Foam board?

Pvc trim?

 

[Shootinok]

Siding.
Get a piece of LP smart side and rip it to the height you want. Double it up for a form thick enough to hold its shape when filled.

Or build up Masonite.

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[The Cobbler]

flexi form plywood

 

[corvette43056]

Buy a synatube that size cut to depth you want

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[cstmg8]

I would think thin plywood/luan would work.

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[p00p]

Lawn edging material. Comes in typical 4" height at various lengths. You can get it taller as well as in a few color options.

https://www.amazon.com/dp/B086CCF462/?tag=atomicindus08-20

 

[plout99]

Plastic 55 gallon drums, cut to the width you want and you can attach pieces together to make them larger in diameter. I made 32 inch concrete pucks this way for my pole barn posts.

 

[Marctrees]

We used Lauan crosscut into 6-8" strips, face grain running w the 8" direction.

So, you have 48" pieces to work with...Lap and glue/ staple on bench night before to make circles larger than 14"

Stakes as needed to hold in place.

Check if soaking the Lauan will make it bendier w/o falling apart.

Lastly, whatever you did for the photo looks to me worked great.

Totally flat Galv steel flashing coil would work way better than Aluminum.

Feel the diff gauges w your hand at store.

If I did it again tommorow, and wanted the tighter radiuses in your photo, I would go w flat coil flashing, after feeling at store.

Excellent to involve the kids.

Marc

 

[topp64]

Hardboard is what we use for a radius that is under 5'. You can find it at Home Depot but you'll have to rip it down to whatever depth you want because it comes in 4'x8' sheets. It's less than $7 per sheet.

 

[nitroracer20]

Masonite?

 

[4EyedTurd]

We all talked about it and decided they liked the silly/goofy shape, I’ll try the next one and as long as we don’t get it to thin on the sides we’ll rock and roll with it. Worst case I’m out 5$ worth of concrete.

 

[nadogail]

If My memory serves me right, Masonite is a brand name for the material generically refereed to as tempered hardboard.

I would think it would be suitable for the purpose.

 

[Jackfre]

I've done quite a lot of tight radius with the "1/4" tempered hardboard/masonite" material. Cut your plywood backing at the radius you need and wrap the tub around it. Support as necessary.

 

[rburke65]

I would think that the Masonite would produce the best results that you are after.