Stage floor levelling - options?

[Ynot]

35 minutes ago, Dave m said:

We aren’t allowed to do any structural work that isn’t fire resistant.

we could make stuff out of normal MDF, but if it is screwed down/up then it needs to be resistant.

I suspect then that there's maybe a bit of jobsworth attitude in your venue then.

[paulears]

Have you tried to set fire to MDF, it's very resistant to catching fire, and tends to burn and smoulder. Probably the chemicals like formaldehyde. If your H&S people are not specifically trained, they see wood. wood = fire. MDF would (in my book anyway) be rated as low fire hazard, but new MDF needs time for outgassing in an enclosed space. The stuff has a very nasty smell in a small room. In my experience, the usual cheap pine used for flat frames is much easier to set on fire than mdf. I work on a pier, and frequently bits of it catch fire from discarded cigarettes. When it does, a bucket of water is far more effective putting it out than any extinguisher. If this amount of wood, exposed to the sun, so hot and dry is safe, I think MDF is way down the list.

[sunray]

On 8/12/2024 at 8:56 PM, Dave m said:

We aren’t allowed to do any structural work that isn’t fire resistant.

we could make stuff out of normal MDF, but if it is screwed down/up then it needs to be resistant.

I use offcuts of MDF to protect the building fabric when soldering copper pipes but wouldn't dream of using timber OSB or ply