Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Insulation

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-07-2013, 11:33 PM   #1
Member
 
Join Date: Jul 2011
Posts: 252
Rewards Points: 154
Default

Insulating in the attic with spray foam


I recently gutted two closets down to the studs in my old house. I even took out all of the old plaster and lathe in the ceiling. I plan to sheetrock the new closets next week.

I've got no insulation right now above the closets. I was thinking about doing spray foam above them then sweeping some of of my blown in fiberglass over the top of the spray foam (I have a lot of blown in fiberglass up there, about R-60). Would it be ok if I just used some canned spray foam? The areas aren't that big, but I'd like to get the best air sealing that I can for maximum energy efficiency. Would this type of foam be a bad idea to be in direct contact with the studs? I know some people believe that open cell spray foam can hold a lot of moisture which might rot the wood.

Could I use a few cans of spray foam? Or should I look at a small diy spray foam kit? Eventually when I remodel my kitchen and my bathroom I will also gut the rooms down to the studs and I'd like to insulate above the rooms the same way. Thoughts? Advice?

strategery is offline   Reply With Quote
Old 04-08-2013, 12:07 AM   #2
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 6,952
Rewards Points: 3,038
Default

Insulating in the attic with spray foam


Foam is fine. Where OC foam is problematic is in areas where moisture migration can condense.

If the roof is vented, there is no concern of that. If you are using it as an air sealant, that is the perfect use in this case.

Windows on Wash is online now   Reply With Quote
Old 04-08-2013, 12:21 AM   #3
Member
 
Join Date: Jul 2011
Posts: 252
Rewards Points: 154
Default

Insulating in the attic with spray foam


What's your opinion on just using several cans of GS spray foam? Or would it be better to buy one of those diy kits?

GS canned spray foam is said to be closed cell btw.

Last edited by strategery; 04-08-2013 at 12:28 AM.
strategery is offline   Reply With Quote
Old 04-08-2013, 12:46 AM   #4
Member
 
Join Date: Jan 2012
Location: Pacific North west
Posts: 1,311
Rewards Points: 626
Default

Insulating in the attic with spray foam


Here is the problem with foam it does have its place like every type of insulation. there are places in the home that are not to be sealed up! one of them is the sheathing of the roof! you need that to breath. you need air flow over that and to have the heat cold exchange to have insulation work. This may sound crazy. but this is how a attic works your home is a certian temp in the summer. your attic is hot as heck. it move cool air from out side under the sheathing to keep the shingles from curling up! in winter time it colder then a brass seat in a out house in december in there. your home is nice and warm warmer air moves up through the vents and helps keep condensation off the sheathing saving you dry rot and mold and damp issues.
Spraying foam in to places like that disrupting the air that your roof needs to breath right. is bad. now for the fun part. say you have it in place you get a torn shingle from a wind storm and leak happens and you don't know about it. water builds up goes down the foam to the top plate and down the back side of the 2x6 extiror wall and you don't even know about it till you find mold problems and roof rotted out and walls full of mold. that is the nasty of foam. as for using GS won't work you need to sray it on with a high psi. hope that helps
Nailbags is offline   Reply With Quote
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
Spray Foam Installation Problems Ron6519 Building & Construction 7 07-11-2011 02:50 PM
Attic Foam Board Insulation JasonCA Roofing/Siding 3 10-07-2010 01:56 AM
DIY spray foam kits HitLines Building & Construction 4 03-18-2010 01:58 AM
Closed Cell Spray Foam insulation and hiring a contractor. Spud Building & Construction 2 10-14-2009 10:03 AM




Top of Page | View New Posts

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