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 Post subject: Celotex for raft?
PostPosted: Feb 17th, '16, 01:43 
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I was curious if there are any health issues with using one of the closed cell foams such as celotex for raft material. Google came up empty on this. The only Styrofoam I could find in large sheets was 2" thick which is more than I want. They had 3/4" Celotex for less than half the price. 3\4" is thinner than I wanted but will it work? Planting head lettuce in the raft. :dontknow:

Thanks,
Gary


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 Post subject: Re: Celotex for raft?
PostPosted: Feb 17th, '16, 12:03 
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I'd look for the Extruded (XPS) Polystyrene which is closed cell. My understanding is that the Celotex is polyisocyanurate which I wouldn't use for rafts but I did use for a solar hot air collector. Dow puts out a blue XPS and Owens Corning puts out a Pink version - preferably without fire retardants added.

This is a decent run down of what you're after.
http://365aquaponics.blogspot.com/2011/09/9-floating-raft-for-deep-water-culture.html

Home depot sells the Owens Corning line - http://www.homedepot.com/b/Building-Materials-Insulation-Rigid-Insulation/XPS/N-5yc1vZbaxxZ1z0w1xo. You'll need to look at the Material Safety Data Sheet (MSDS) and determine if this meets your needs.

You may also find a local supplier of Dow Blue Board or other XPS distributor by asking where the local building products people get their insulation products. This works especially well if they don't have what you want.


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