George Whiting
  • East Walpole, MA
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Retrofit insulation on the roof over cathedral ceiling
24 Replies

I have an under-insulated roof above a "cathedral ceiling".  The shingles need to be replaced this year.  It occurred to me that this could be an opportunity to insulate from above.Can it make sense…Continue

Tags: Retrofit, Roof, Insulation

Started this discussion. Last reply by R Higgins Mar 25, 2013.

 

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R Higgins replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"Definitely anytime the roof is on its last legs work rip it off and work from the top.  Otherwise, Instead of removing the exisitng GB below the ceilinig you just leave it and work on top of it - (working on the assumption there's…"
Mar 25, 2013
Kevin Wood replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"No way would I start from the bottom. It is so much easier to re-due the roof then remove drywall and trim and whatever else is on the ceiling. Other thing not considered is the control of debris, fiberglass, drywall dust, possible mold exposure,…"
Mar 25, 2013
R Higgins replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"Two reasons not to attack a new waterproof roof: 1.  100% of the patches have to be perfectly waterproof for near 20 yrs, which for me means a double patch, which... 2.   Leaves you with an irregular roof, assuming you can get…"
Mar 24, 2013
George Whiting's discussion was featured

Retrofit insulation on the roof over cathedral ceiling

I have an under-insulated roof above a "cathedral ceiling".  The shingles need to be replaced this year.  It occurred to me that this could be an opportunity to insulate from above.Can it make sense to insulate above the plywood roof deck? Or to remove the plywood roof deck, add insulation, and re-install the plywood roof deck on top of that? Accessing the insulation from inside would require ripping down and re-installing a perfectly good ceiling.  I believe there's no more than 6-8 inches of…See More
Mar 21, 2013
Bruce Navin replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"A minor note-'plywood' can be a used as a bit of a generic term for a number of products. I'd go with 5/8 OSB for the airsealing qualities. Every little bit helps. "
Mar 21, 2013
Ken Watts replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"George, you got many great comments and suggestions.  All the issues were considered by the combination of the comments.  If you go to the Building Sciences web site and access Research Report - 0404 you will get a detailed explanation of…"
Mar 21, 2013
Christopher Sayles replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"George,   We have been using the technique of removal of the roof deck along with the shingles for a while now.  Results are quite amazing.  However the only way to get amazing results is to use closed cell foam in the rafter…"
Mar 21, 2013
Brian Crounse replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"I have a similar cathedral ceiling. Unfortunately, it has pretty new shingles, as we re-roofed the house a couple years ago without my realizing that this presented an opportunity to improve the cathedral ceiling. I got a quote from a local…"
Mar 14, 2013
George Whiting replied to Doug Horgan's discussion Geothermal real-world performance
"There are several types of geothermal (aka geoexchange) systems, and they will all operate differently depending on the application.  Closed loops, standing column wells, pump and dump, direct exchange... they all have their pluses and…"
Feb 25, 2013
Doug Pearl replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"http://www.buildingscience.com/documents/insights/bsi-063-over-roofing?topic=resources/retrofits Article by Joe Lstiburek. I don't think its a project that I would undertake, but it makes for a good read.  "
Jan 17, 2013
George Whiting replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"Thanks to everyone for your replies.  The response was way beyond my expectations!   I really appreciate it.  I'll be glad to see the snow lasting longer on the roof next winter, and the room not getting so hot in the…"
Jan 11, 2013
George Whiting's discussion was featured

Retrofit insulation on the roof over cathedral ceiling

I have an under-insulated roof above a "cathedral ceiling".  The shingles need to be replaced this year.  It occurred to me that this could be an opportunity to insulate from above.Can it make sense to insulate above the plywood roof deck? Or to remove the plywood roof deck, add insulation, and re-install the plywood roof deck on top of that? Accessing the insulation from inside would require ripping down and re-installing a perfectly good ceiling.  I believe there's no more than 6-8 inches of…See More
Jan 10, 2013
Don Hynek replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"A couple of replies (Robert and Sean) are on it -- fill the cavities with cellulose, add enough foam above the deck, then re-roof without venting. But, you wanted some theory to back this up... Note that cellulose in unvented ceilings is…"
Jan 10, 2013
Pat Dundon replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"we have many successful jobs done where a roof was removed, we sprayed closed cell foam down on the interior sheetrock and a new roof was applied.  it is very expensive to do this, but it works well.  you need a minimum of 3 inches of…"
Jan 10, 2013
Kevin Wood replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"Sorry I can't access where it is but your best bet is to remove the plywood and add Closed cell SPF leave a gap below the new applied plywood sheathing and ventilate from the soffit to the ridge vent. this will prevent the ice dams. A project…"
Jan 10, 2013
Joseph J. Ilacqua replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"I believe your best option is to deal with this when you have the roof off. I would suggest, if possible is to remove all of the existing insulation and replace with dense pack cellulose. If you achieve the proper density of 3.5 to 4.0 #'s per…"
Jan 10, 2013

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At 1:23pm on October 11, 2011, Diane Chojnowski said…

Hi George,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!


Thanks!
Diane, HEP Moderator

 
 
 

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