Literally everything melts here.

[Chotu]

Originally Posted by RKsailsolo

So to summarize, the polystyrene foam and reflectix sandwich is mounted on the inside of the window with the reflectix directly against the poly carbonate. Right?

Fascinating solutions thread. Thanks for letting us learn alongside you.

That’s correct.

Xps (extruded polystyrene) with reflectix insulation glued to the outward facing face using 3m spray adhesive.

These things go up fast.

My windows are flush outside and have a recess of 3/4” on the inside. I used 3/4” xps foam. And these stick in place from the inside.

The results are outstanding. Total blocking of all heat. Nothing gets through. The foam is no hotter than the ambient air in the boat.

On the unexpected side of things, this dramatically cooled down my polycarbonate too and helped ease some of the thermal expansion stresses the bare windows had.

I put up a couple more today after the success of the first one. Soon, I’ll go all out and block everything but my opening windows.

[RKsailsolo]

Would be interesting to measure poly carbonate surface temp with and without the foam-reflective cover.

[Chotu]

Originally Posted by RKsailsolo

Would be interesting to measure poly carbonate surface temp with and without the foam-reflective cover.

I can say it’s a little too hot to touch with no reflective insulation panel and plenty warm with the panel in place.

No quantitative data. I’ll leave that to someone else who isn’t building a 50ft boat. Lol

[RKsailsolo]

Originally Posted by Chotu

I can say it’s a little too hot to touch with no reflective insulation panel and plenty warm with the panel in place.

No quantitative data. I’ll leave that to someone else who isn’t building a 50ft boat. Lol

Close enough! 😎

[Bluechart]

I learned from previous owner, tape foil inside all hatches and windows, when in Areas of High sun intensity, works great to protect and keep heat down. (Since then, we’ve had covers made, which are always deployed when we are not onboard.)

[RKsailsolo]

Window tint on outside of window seems to be best way to redirect solar energy out.

[plittle2005]

Originally Posted by GordMay

New study shows bodies found from the Bermuda Triangle all died from heat exhaustion...

... Everyone knows its 180 degrees inside a triangle, so why would people even bother to travel through it?

That's good. Lame, but good!

[timb7734]

I use “Reflectix” insulation sold at Lowe’s or Home Depot. Foil covered panels cut to fit. I have routinely measured a ten degree differential when these are deployed over windows although the area is then dark from blocked sunlight. In the salon where the windows are large I move them from side to side as the sun passes over. I also have a bow cover tarp to lower convective heat gain forward where we sleep.