Molding vermicrete

[Neil2]

All perlite sold at nurseries will be "popped" or expanded. What use is it an any other form ?

I tried to see which of the boxes on the bag in your photo were checked off. Perlite often comes in "fine". "medium" and "course". You want the "coarse" grade.

[fxpose]

I checked with the local masonry supplier and they only carried them in fine form so I went ahead and picked up the medium aggregate from Home Depot. I'm not using it for insulation, but just for forming and molding. I think this will work just fine.

Thanks,
George

[fxpose]

Can I add lime to the perlite/cement mix? Would that make molding easier, as far as making the mixture sticky? I just happen to have a lot of lime left from doing the homebrew.

George

[Tscarborough]

Sure you can, but I wouldn't go past 1:1 with portland if you are planning on troweling a finish coat over it.

[fxpose]

Perfect. I'll do that.

Thanks,
George

[dublintom]

Hi lads
I,m ready to pour vermiculate base but could only get medium grade ie 2-5mm. Will this be ok or should i continue to look for course grade.
Tom

[Neil2]

"only get medium grade ie 2-5mm. "

That will work fine. Hand mix gently to avoid breaking up the vermiculite particles.

[dublintom]

Thanks Neil