I have a couple of Polycarbonite skylights that have condensation problems on very cold (15 F) mornings. Apparently the problem is humidity that freezes and then melts. The shaft is insulated, not sure how adequately. Any suggestions other than moving the house down to Texas away from freezing temps would be appreciated.
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Skylights and condensation go together like PB and Jelly
Excellence is its own reward!
Consider replacing the dome. Do you really like the way it looks ? Many times the domes are mounted on curbs which can remain and you can replace the lid with a custom insulated glass unit. We do this all the time. The replacement unit is pretty expensive, but it installs in about 15 minutes. (no kidding) No reframing, drywall, painting, etc. that you would have to do with a Velux replacement that is a different size. We get the units from a local supplier who gets them from:
http://www.starlightskylights.com/
You should take a look at this page:
http://www.starlightskylights.com/orcasite/tcurb.html
They are really well made. The last one I priced was about $500 for the unit. You get a custom sized welded aluminum frame with an insulated glass unit. You remove the screws from the old one, silicone the existing curb, set the new unit, 6 or 8 stainless screws in the sides and you are done. Check to see if you have a curb that you can reuse and consider the unit with the thermal break.
carpenter in transition