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

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-15-2011, 10:25 AM   #1
Newbie
 
Join Date: Jan 2011
Posts: 1
Rewards Points: 10
Default

stone coated steel and spray foam insulation


My wife and I are entering into the planning stages to build a new house. The house will be built in Florida and we are interested in making it as resistant to hurricanes as possible. We are interested in a stone coated steel roofing system for the hurricane resistance and heat reflection properties. Given the heat we also experience in FL I am interested in foam insulation for the underside of the roof deck. Are there issues concerning applying a stone coated steel roof over top of a deck that is foam insulated from under neath? My reason for asking about this is because I have heard that the spray foam in essence creates a conditioned space in the attic that would make sense not to vent and may create substantial differences between the inside and outside of the decking (I.E. swelling and contraction). Do you know if the attic space should be considered as part of the conditioned space with the AC system so as to alleviate any concerns with swelling / contraction of the decking and roof system? I have looked at the ASHRAE article on this vented nonvented space discussion but it hasn't answered any of my questions.Any help is greatly appreciated.

Thx.

Chris

waternut is offline   Reply With Quote
Old 01-15-2011, 05:48 PM   #2
Member
 
Tom Struble's Avatar
 
Join Date: Dec 2008
Location: west milford n.j.
Posts: 2,785
Rewards Points: 2,000
Default

stone coated steel and spray foam insulation


yes this is the current wisdom i believe,but i would vent the space between the roof decking and the roofing
,are you using the ''Spanish tile'' metal roofing? i think that gets installed on horizontal nailers

Tom Struble is offline   Reply With Quote
Old 01-15-2011, 06:36 PM   #3
Member
 
Join Date: Nov 2010
Location: Indianapolis
Posts: 84
Rewards Points: 75
Default

stone coated steel and spray foam insulation


The stone coated shingles are usually screwed straight to the decking tom. I agree with using a breathable underlayment like GAF deck armor, or even felt.

Quote:
I have heard that the spray foam in essence creates a conditioned space in the attic that would make sense not to vent and may create substantial differences between the inside and outside of the decking (I.E. swelling and contraction). Do you know if the attic space should be considered as part of the conditioned space with the AC system so as to alleviate any concerns with swelling / contraction of the decking and roof system?
Correct that you don't need ventilation. There won't be a substantial difference between the outside of the decking and the underside of the decking, as osb/plywood is not a good insulator. The exterior side of the foam stays the same temp as outside air, and the interior side stays the same temp as the attic.

If the attic needs to be conditioned it's definitely not for the benefit of the roof decking. I can't say for sure that it doesn't need to be, but I highly doubt it.
jmiller is offline   Reply With Quote
The Following User Says Thank You to jmiller For This Useful Post:
Tom Struble (01-15-2011)
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Crawlspace Wall Insulation Earnie Building & Construction 28 10-23-2012 06:59 PM
Steel studs / Basement Insulation Chemist1961 Building & Construction 9 06-26-2009 01:54 PM
Tyvek with Spray Foam Insulation, Yes or No? Zinger Building & Construction 9 01-28-2009 04:29 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.