Is Hdf Board Ok

[trt]

for outside use in the garden if its treated?

[The Builder]

It's harder, stronger, and denser than MDF... rather like hardboard. Certainly has greater resistance to moisture than MDF, but since it's a compressed fibreboard, I wouldn't like to use it outdoors.

Treatment (from rot) isn't the problem. I think water would eventually cause it to swell and fall apart.

I think you'd be better off with exterior plywood.

[trt]

Thanks builder, i actually meant MDF. would that be ok if treated?

[SlackAlice]

MDF will be worse than HDF. Even if you treat it, I suspect it would eventually absorb moisture and fail.
Certainly wouldn't use it outdoors or anywhere subject to constant damp.

[The Builder]

I agree with Slacks.. definitely not to be used outdoors :o(((

[trt]

Ta folks.