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exintex
The exintex would trap heat I'd expect if you have a relative air seal in your observatory (humidity would also be a problem in that case). However, if you have some passive and active air flow vents this is not a problem. The exintex has a bonded webbing on the outside for strength and good adhesion to rendering. The polystyrene has some sort of rock dust mixed in with it and so has a good fire/pest rating and excellent thermal properties. I have also recently used it again in a small 1800x800x800 enclosure for an EM200 mount near the pool. This also has 2 vents and a solar powered fan. It keeps the mount much cooler than the outside and so far shows no sign of heat build up issues.
I'll be using the same panels for the next level of the house when we get around to it.
guy
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