Re-insulating existing skylight

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Old 01-31-17, 04:28 PM
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Re-insulating existing skylight

Because of high energy costs I am adding insulation to my attic to bring it up to R-38. I have an approximately 6-8 foot skylight (from ceiling to roof) with and irregular shape (trapezoid from ceiling to roof, 2x4 framing) in my attic that currently has R-11, faced, fiberglass insulation. Some of the insulation has fallen off or appears dirty with probable air leak. I would like to add insulation and bring up the R value of the skylight. In researching, there appears to be 4 options:
1) repair existing insulation, wrap skylight to prevent air leaks
2) replace existing insulation with higher R-value faced insulation, with or without wrap
3) repair/keep existing insulation, cover skylight with foam board insulation with foam sealant at board interfaces.
4) repair existing insulation and seal air leaks, over wrap with unfaced higher R-value batt or rolled insulation, although with the irregular shape, I don't know how I would keep the insulation in place.
Any suggestions by someone with more experience than me would be appreciated.
 
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Old 01-31-17, 04:33 PM
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Welcome to the forums! Being a vertical surface it may be difficult to get regular insulation to work correctly. I am for door #3, with the exception that I would go ahead and spend a little money and apply 2" of foam board and tape all intersections and foam where it meets opposing planes. Since this is in your attic, you don't need a great deal of fiberglas, and heat rises, so most of it will stay in the tube, anyway.

Hang in there as others will have more information and possibly different solutions.
 
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Old 01-31-17, 10:57 PM
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Thanks. I noticed there are several types of foam board insulation. Any particular type that would work better in this situation?
 
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Old 02-01-17, 03:17 AM
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Old 02-01-17, 04:23 AM
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Here's an article that might be helpful. Air sealing will be important and this article shows many locations to focus on.
Insulated Skylight Shaft

Bud
 
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