"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…"
-
George Whiting
- East Walpole, MA
- United States
- Featured Blogs
- Discussions (6)
- Events
- Groups (3)
- Photos
- Photo Albums
- Videos
George Whiting's Groups
-
Renewable Energy
60 members
-
Center for Ecological Te…
10 members
-
HVAC
155 members
George Whiting's Discussions
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.
George Whiting's Page
Latest Activity
R Higgins replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
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,…"
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…"
George Whiting's discussion was featuredRetrofit 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
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.
"
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…"
"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…"
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…"
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…"
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.
"
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…"
George Whiting's discussion was featuredRetrofit 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
"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…"
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…"
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…"
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…"
Profile Information
- Company
- EcoHeat Solutions LLC
- Professional Interests
- Central heating, wood pellet central heating
- Website URL
- http://www.ecoheatsolutions.com
- Twitter ID
- EcoBoiler_USA
Comment Wall (1 comment)
- 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
Home Energy Pros
Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy, under the American Recovery and Reinvestment Act) and brought to you in partnership with Home Energy magazine.
Latest Activity
tedkidd replied to Jose Macho's discussion Why Are Energy-Saving Home Inprovements Down??"Pat, I think you and I agree on a LOT of things.
One thing I don't want to see is more…"
tedkidd commented on Tom Delconte's blog post Robert Shiller Says Retrofits Are Never Worth It!"Bob B.
Buying a home is a good investment because it is forced savings more than a good…"
Joe Huang posted a discussionWhite Box Technologies launches Web-based weather data for building energy simulations
White Box Technologies is pleased to announce under agreement with ASHRAE the launch of WBT Weather…See More
Joseph Lamy commented on Jim Gunshinan's blog post The Universe Is Made of Stories"My life changed when I got 'ductalatored' - became familiar with proper sizing guides for…"
Judi Lyall joined allen p tanner's group
Energy Auditing Equipment for Sale, Trade or to Purchase
Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
Judi Lyall replied to David Starrett's discussion I am looking for a good IR camera in the group Energy Auditing Equipment for Sale, Trade or to Purchase"Hi there
I am selling my equipment and have a great Fluke TIR for sale for 3600.00
If…"
William H Nickerson commented on Tom Delconte's blog post Lykans $29, Vampires $0 !"66 watts a/sec -3960 w/min 237600 w/hr 5702400 w/day …"
tedkidd commented on Jim Gunshinan's blog post The Universe Is Made of Stories"I think Tom is busting your chops Jim. The "drivel" part may not have been well…"
Tom Maides commented on Jim Gunshinan's blog post The Universe Is Made of Stories"Some of the best scientists of the previous 1000 years were also leaders in the Church. Aside…"
Laurie DiDonato posted an eventHERS Rater Training in Massachusetts at Maki Building Center
June 3, 2013 to June 8, 2013
6-Day HERS Rater Training- The first step to becoming a HERS RaterLast Week To Register!Your Cost…See More
© 2013 Created by Lawrence Berkeley National Laboratory.
