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perlite horticulture vs construction grade

Posted by joeworm n fl (My Page) on
Mon, Mar 12, 12 at 10:02

Is there a difference?

I found a construction supply company that sells a 4 cubic bag of perlite for $12.00.

What does the construction industry do with perlite?

Is this safe to use?

Thanks


Follow-Up Postings:

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RE: perlite horticulture vs construction grade

  • Posted by tapla z5b-6a mid-MI (My Page) on
    Mon, Mar 12, 12 at 14:21

It's often used as insulation. Perlite is 'closed-cell' and doesn't absorb water like vermiculite (also used as insulation), so there is probably less chance it would have been treated with something to make it water-repellent, but I would still ck it out to be sure.

Al


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RE: perlite horticulture vs construction grade

I found that this perlite is very fine, similar to sand.
Will this work or do I need the course perlite. Seems like everything in mixes I've seen is course.

Thanks


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RE: perlite horticulture vs construction grade

  • Posted by tapla z5b-6a mid-MI (My Page) on
    Mon, Mar 12, 12 at 16:07

I prefer coarse in the 5:1:1 mix and consider it a requirement if it's substituted for the granite in the gritty mix.

Al


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RE: perlite horticulture vs construction grade

Okay, I'll keep looking.

Thanks


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RE: perlite horticulture vs construction grade

is horticultural perlite different than something labeled coarse perlite (and sold at a garden center)? only reason i ask is that the first was about $12 more than the second (maybe that nursery was just that much more expensive)?
Thanks


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RE: perlite horticulture vs construction grade

  • Posted by tapla z5b-6a mid-MI (My Page) on
    Tue, Mar 13, 12 at 13:22

Anything you buy at a garden center or plant-related operation is probably going to be fine. I know they treat vermiculite with water repellents when it's going to be used as insulation, but I don't know about perlite. The price of perlite varies A LOT. I buy from a wholesaler that repackages 60 cu ft bags on pallets into 4 cu ft bags for $10/4 cu ft ...... and I have to believe the bags are worth at least a buck/ea??

Al


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RE: perlite horticulture vs construction grade

it was $30 for 2cu ft of labeled horticultural perlite at a garden center. That seemed really high (and it was in a seemingly rural area of MD)


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RE: perlite horticulture vs construction grade

  • Posted by tapla z5b-6a mid-MI (My Page) on
    Tue, Mar 13, 12 at 17:35

That does seem quite high. I saw it last year for $17/3 cu ft @ a local greenhouse operation.

Al


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RE: perlite horticulture vs construction grade

  • Posted by rina_ 6a Ont (My Page) on
    Tue, Mar 13, 12 at 22:38

Horticultural grade perlite in large bag 10kg (approx. 22 lb)-no idea how many cu ft & it costs $30 in Toronto (large garden centre)...

Photobucket


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