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Old 15-04-2015, 19:17   #16
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Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,025
Re: Insulated Window Material

That's cool SailMonkey!

We ended up going with polycarbonate. We then cut reflectex to the sizes we need and then we put them between our porthole screens and the porthole poly. It works really well and reduces the heat in the boat pretty dramatically. I assume that we could get even better results using a real insulating material and the reflectex material together but we are happy with just the reflectex. Plus, its pretty cheap. We also made some for our hatches.

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Old 18-04-2015, 13:27   #17
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Join Date: May 2011
Location: On my boat, currently in Tahiti
Boat: Trireme 35 (and a bit)
Posts: 717
Re: Insulated Window Material

On "Pelagic Australis" the pilot-house windows are double glazed with a 24mm air-gap. The outer glass is 12mm ballistic stuff (bullet proof) and the inner glass the windscreen stuff that shatters into small cubes. It's been there almost 12 years now without any issues except that we broke the inner on one when taking it out to re-bed it after about 7 years. The bedding is sikaflex 295UV

The panels were made up by a company that does the glazing for bullet-proof limos.

The big front window is about 1.2m by .75m and they have taken a pounding at times from both objects and water. The worst damage has been done to the corners of one panel by an over enthusiastic painter with a sanding pad!

Double glazing (without a reflective barrier) won't keep radiant heat from the sun out but it certainly keeps the cold out and more or less eliminates condensation on the glass.


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