Sub-roof For Hot Roof? - Roofing/Siding - DIY Home Improvement | DIYChatroom

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding


Thread Tools Display Modes
Old 04-13-2013, 04:19 PM   #1
Join Date: Apr 2013
Location: Traverse City, Michigan
Posts: 2
Rewards Points: 10

sub-roof for hot roof?

I have a question about a hot roof problem in cold climate. The problem I have is Ice Build up in the winter over 2/3 of the roof deck. We have a cathedral ceiling with probably medium insulation but we get a ton of snow so there is ice buildup resulting in ice dams.
Local roofer suggest a sub-roof by laying fir strips over the old roof deck after shingles are removed. I can not find any information on Sub Roofs or this process. Will there be moisture build up in the 1" space between decks? if there is moisture how do you keep that out of the interior dry wall ceiling. Or will moisture not be an issue. Is this an alternative process to improve venting?


niner is offline   Reply With Quote
Old 04-13-2013, 04:40 PM   #2
Join Date: Nov 2011
Location: Hartfield VA
Posts: 34,584
Rewards Points: 14,300

I do not see where that's going to do anything to stop the real problum.
Lack of insulation and proper venting is the real problum.
One way around it would be if he suggested using SIP panels on the roof.
Google it.
Since you chose to not add your location to your profile it's hard to give a real answer.
Go to Quick links to edit.


When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
joecaption is offline   Reply With Quote
Old 04-14-2013, 12:49 PM   #3
Join Date: Apr 2013
Location: Traverse City, Michigan
Posts: 2
Rewards Points: 10

Thank you for the imput. I should have put in I am in Northen Michigan. Although it doesn't get real hot here I am worried about the Moisture build up. I saw once what could happen if roof vents are plugged and moisture can build fast and then you have a real problem!
The sub roof deck over the old roof deck will have a 1" open space with venting top and bottom and gable end vents also, and I got a good price quote for it. I'm not sure I can economically add more insulation as I don't want this to be a real expensive project. My biggest concern is moisture in between the sub roof and main roof is making me nervouse to go back to doing a convetinal roof shingle job and just live with the Ice build up. I don't want to make bigger problems with the double deck or sub roofs as I have never heard of double roof deck or sub-roof with cathederal ceilings.
niner is offline   Reply With Quote
Old 04-15-2013, 05:43 PM   #4
Join Date: Oct 2012
Location: Maryland
Posts: 3,726
Rewards Points: 2,210

You need to create a cavity space over your existing insulated deck that allows outdoor air to travel up and out the ridge vent. This will take 2 x 2 sleepers placed over D226 felt that run from eaves to ridge, New deck and new roof, fully vented eaves, and good ridge vent. Turn your compact warm roof into a cold roof. No more ice.
" Most people would rather die than think, and most do " Bertrand Russell

jagans is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Proper transition between shed roof and shingled roof? aribert Roofing/Siding 9 04-12-2012 03:17 PM
Tell me about roof coatings for an older roof Leica Roofing/Siding 3 09-19-2010 01:55 PM
Flat roof and insulation quandry paredown Roofing/Siding 2 08-20-2010 11:50 PM
Tying new roof into old. Clutchcargo Roofing/Siding 15 11-07-2009 05:48 PM
Please help with the design of this roof jaymay75 Building & Construction 1 05-06-2008 09:44 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1