hey – long time no see….anyway, I’m replacing my greenhouse roof with twin-wall polycarb, but have no install instructions – one site I found said “leave the bottom end of the panel open to allow moisture to escape” and then “be sure to seal all ends”….?also, one supplier has the standard H-channel for joining panels, while another says those leak, and offers a much more exspensive cap-and-seal thing…anybody know?
preciate it…
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They sell a tape to be applied along the ends to prevent critter and debris from getting in while allowing air flow.
My green house hase it on the bottom of my panels. I haven't yet but plan to install a metal ridge cap of some sort and a gable bottom detail .
When I made some basement window well covers I used twin wall and wrapped all sides with the poly carb edge pieces.
Here's a site
http://www.charleysgreenhouse.com/
Edited 10/8/2009 10:00 am by jagwah
The H rail is fine for walls, but I wouldn't use it for a roof unless it is a dirt floor affair where some leaks would not matter much, or you own stock in a silicone caulk company.
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Over my window wells I used the H rails but then if they leaked a little it wouldn't matter. I saved money on the 2 piece leak proof rails with my green house by making and sealing PT wood rails.
If I was doing a residence I would definatly be using the proper system. The web site I listed shows all the parts.
Edited 10/8/2009 2:05 pm by jagwah
thanks for the info - I guess I was mistakenly thinking the panels would be totally sealed to get the energy efficiency they advertise- like a window, but then it would have to be a vacuum, right?no h-channel for me!!!!charlie's greenhouse....I used to get their catalog....guess I'll look them up.....thanks again....
I've done several green houses with 5/8 acrylic. It is slightly less than 4 feet so you can do a 2ft. on centre structure having one thinner to support the centre and dado the other on both sides to accept the glazing then make a cap and use as a pressure plate with a glazing tape. I like the acrylic because it can be cut with a sharp carbide blade. I also use a clear cedar for the frame and windows then attach sky lights that can be opened in the summer to use convection for cooling. Good luck. Love the green houses.