Lisa,
If you don't have roof vents above an internal shade cloth you are defeating your purpose of heat reduction. Black, green or Aluminet the problem is still the same. If you put the shade cloth on the roof then the typical shade cloths should be suspended at least a foot above the glazing to reduce the transmision of heat thru the glazing. Aluminet can be draped right on the glazing without that problem. I recently switched from black knitted to Aluminet and experienced a 3-5 degree drop in internal temp with the same shade factor. BTW Gintec in Canada has great prices on custom fabricated shade cloth with prompt delivery.
Paul LeBlanc
In SUNNY SW FL.
>-----Original Message-----
>From: Buzz Baxter [mailto:[EMAIL PROTECTED]
>Sent: Tuesday, April 19, 2005 07:33 AM
>To: [email protected]
>Subject: [OGD] Shade cloth
>
>Most of the new greenhouses I've visited recently seem to favor internal
>shade cloth. What are your experiences? How is this decision shaped by
>the transmission properties of polycarbonate?
>
>--Lisa Thoerle, pleurothallidiot from Little Compton, RI
>
>Lisa,
>
>All of our greenhouses have the shade cloth on the outside. We found here in the Midwest that in the hot summer months there was too much heat buildup from having the shade cloth inside. Having said that I only have experience with conventional black mesh cloth, but it makes sense to think if you are blocking light and heat it has to give it up to somewhere and that surface will be at the point of blocking, I learned the hard way that keeping the shade cloth secured is just a matter of good staking and good restraints.
>
>Hope this helps a little,
>
>Buzz
>Windsong Orchids
>
>
>
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