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Post by Deleted on Sept 21, 2014 15:25:02 GMT
Hey all,
I have an obsy project underway that will have a light open frame roof. I'm in an area which has a maritime air condition. Dew is a given most nights. And, I'm thinking a rain forest inside an obsy may be less than desirable.
I can skin it with heavy tarpaulin only, tarpaulin inside and outside the frame, light plywood covered with tarp, or plywood/tarped outside and tarp inside the frame.
There's a considerable quantity involved so I'd like to get this right the first time. My question is which of these, if any, will retard formation of dew on the underside of the framework?
Appreciate your thoughts!
Bob
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Post by johnno on Sept 21, 2014 21:01:17 GMT
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Post by Dragon Man on Sept 22, 2014 4:39:53 GMT
Bob, any porous surface on the inside is preferable. Non-porous surfaces will allow condensation to collect and drip onto your gear. Tarpaulin is non-porous. So is styrofoam, plastic etc.
Whereas, unpainted ply is porous. Even though it may still collect some condensation and drip, it will be significantly less. Maybe cover the underneath of the unpainted ply with hessian. That shouldn't drip any condensation. Old blankets are even better. Just glue an old blanket to the Ply. Blankets are great for sucking up moisture.
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Post by Deleted on Sept 22, 2014 17:03:13 GMT
John, thanks for the thought. I've been thinking about foam insulation vs. not, but I wonder if this would work against me for maintaining balance with outside ambient air temp's during a session. I'm going to have to work out a way to vent air in the peak of the roof while I'm at it. Ken, you've brought the clarity I've been seeking "to the table". Porosity is the key! Thank you so much. I had to Google Hessian as that's not a term I know. For a while there I was wondering how I was going to find eighteenth-century German soldiers let alone glue them to the inside the roof panels. Fortunately, the other kind is more readily available . You two are great, thanks again! Bob
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Post by Deleted on Sept 22, 2014 18:29:21 GMT
Take a look at my observatory website. www.mts.net/~lmlod/Observatory.htmlDuring the summer humidity levels often hit 100% when it cool down at night. It gets so dripping wet outside you could wash your car without the water hose. I have no weather or temperature related problems with my observatory. Winter or summer. The inside of the observatory is always free of dust, insects and condensation. When I open it at night the inside temp is usually within a few degrees of ambient.
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Post by Dragon Man on Sept 23, 2014 8:01:18 GMT
For a while there I was wondering how I was going to find eighteenth-century German soldiers let alone glue them to the inside the roof panels. Bob Sorry Bob, international terminology. Burlap or blankets.
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Post by Deleted on Sept 23, 2014 15:52:53 GMT
Hello idb,
Thanks for the link. Nice obs' you have there!
Good food for thought with insulating the whole structure. Thanks again,
Bob
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