New Construction Spray Foam Insulation - Insulation - Page 2 - DIY Chatroom Home Improvement Forum
Advertisement


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

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

Like Tree7Likes
Reply
 
Thread Tools
Display Modes
Old 02-11-2019, 09:02 AM   #16
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 21,170
Rewards Points: 6,038
Blog Entries: 40
Default

Re: New Construction Spray Foam Insulation


There are other than "spray foam" ways of insulating the structure that will actually make it dramatically outperform a typically SPF cavity fill insulation application.
Windows on Wash is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-11-2019, 09:13 AM   #17
Still learning every day!
 
F250's Avatar
 
Join Date: Feb 2018
Location: Birmingham, AL
Posts: 403
Rewards Points: 806
Default

Re: New Construction Spray Foam Insulation


I can't even begin to imagine choosing 2x4 wall construction anywhere I would want to live, and I'd even be willing to consider 2x8's if I were building from scratch.
Windows on Wash likes this.
__________________
Pete

Bark less, wag MORE, and Show Compassion to everyone you meet!
F250 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-14-2019, 12:42 AM   #18
Member
 
Join Date: Aug 2018
Location: Kremmling, CO about 7500'
Posts: 1,115
Rewards Points: 218
Default

Re: New Construction Spray Foam Insulation


I built an addition and used spray foam. I was glad I did. There was a distinct difference the master bedroom (which was part of the remodel/addition) and the other bedrooms in both heating and cooling as well as noise suppression.

So, would I do it again, if I had the money for it, yes. At the very least, I would consider a flash coat to seal any intrusions and then use either rockwool or just regular fiberglass. I like rockwool as it is a good sound deadener, and is mold and rot resistant.
ktownskier is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-14-2019, 01:06 AM   #19
Member
 
Join Date: Feb 2019
Location: Cincinnati, OH
Posts: 66
Rewards Points: 132
Default

Re: New Construction Spray Foam Insulation


I have used spray foam for one area before. The kits they sell are pretty easy and I don't think it was as tough as others are saying. However, I would rather flash spray everything to seal and then use fiberglass. There is always that one extra outlet you want or a flat panel TV etc.

My parents had a custom piece of furniture built out of oak by the Amish. It was an entertainment center that they believed would be a family heirloom. However, the spot for the TV was 4:3 and 10 years later the world move to 16:9. Basically what I am saying is...spray foam has it's benefits, but in the future will limit you if you ever decide you need to run a wire...however, the world is moving wireless.

As a vapor barrier it is great, as insulation it is great...However, if you really want sound reduction, there are drywall offset products, like resilient channel, or you could use insulation then two layers of 5/8 inch drywall with green glue.
Ca443 is offline   Reply With Quote
Old 02-14-2019, 01:20 AM   #20
APA
Member
 
Join Date: Jul 2018
Posts: 73
Rewards Points: 146
Default

Re: New Construction Spray Foam Insulation


Some of you guys must have unlimited funds to build houses. 2 X 8 exterior walls? 1 1/4" of sheetrock? Jeez...
Richard Pryor likes this.
APA is offline   Reply With Quote
Old 02-22-2019, 10:51 AM   #21
Member
 
listo's Avatar
 
Join Date: Nov 2008
Posts: 227
Rewards Points: 107
Default


When going through firefighter courses it was brought up that spray foam in a new build is a bad idea. As the studs dry they shrink slightly. The spray foam remains rigid and leaves small gaps between the insulation and studs. This causes a chimney effect that helps fires spread faster. Even though the void is very small I imagine that your insulation/vapour barrier would be compromised as well.
listo is offline   Reply With Quote
Old 02-22-2019, 12:23 PM   #22
Member
 
Join Date: Dec 2017
Posts: 489
Rewards Points: 980
Default

Re: New Construction Spray Foam Insulation


You can get good R value with a 2x4 wall if you put up exterior rigid foam. Not sure what the sound dampening benefits of that would be, but it's a good insulation strategy.
For good insulation and sound dampening in the 2x4 cavity, I'd suggest rockwool. Way cheaper than foam and it's fireproof.
I love the idea of closed cell foam, but the cost is just too hard to justify if you've already done a decent job of air sealing during framing. As far as DIY for the foam, count up how many of those kits you'd need and I don't think it will be any cheaper than hiring a professional outfit to do it.
Yodaman and Richard Pryor like this.
NotYerUncleBob2 is offline   Reply With Quote
Old 02-22-2019, 09:59 PM   #23
Member
 
Join Date: Jan 2019
Posts: 43
Rewards Points: 78
Default

Re: New Construction Spray Foam Insulation


Cost is one thing, but it's so ironic that today I had a conversation with someone at work who has spray foam insulation between his roof rafters. Problem is, his 30 year guarantee roof stated leaking after only 10 years now, but spray foam didn't make it evident for at least several years judging by the amount of rotten roof sheathing that now has to be replaced.


It turns out to be a major job now to repair everything, break away existing spray foam and insulate again. I am not sure if he is going with a spray foam this time around.
Bud9051 likes this.
davison0976 is offline   Reply With Quote
Old 02-22-2019, 10:14 PM   #24
Member
 
Join Date: Jan 2019
Posts: 43
Rewards Points: 78
Default

Re: New Construction Spray Foam Insulation


Quote:
Originally Posted by NotYerUncleBob2 View Post
For good insulation and sound dampening in the 2x4 cavity, I'd suggest rockwool. Way cheaper than foam and it's fireproof.

Rockwool is a fantastic product. For interior insulation however, like wall cavity insulation, I would suggest a "AFB evo" version of the product because it's manufactured using a formaldehyde free binder. Other versions contain formaldehyde which is a known carcinogen. For exterior insulation, like comfortboard, formaldehyde based binder is fine.
davison0976 is offline   Reply With Quote
Old 02-27-2019, 09:01 PM   #25
Collector of tools
 
Join Date: Jun 2016
Location: Syracuse NY
Posts: 66
Rewards Points: 126
Default

Re: New Construction Spray Foam Insulation


In terms of DIY spray foam, my neighbors had it PROFESSIONALLY applied in a renovation/repair area. The guy got the chemical mix wrong and my understanding is that the stuff off gases but wont cure. They vacated the house for several months, had an HRV installed and are now trying to sell. I think they may have had it all ripped out. They never moved back in.

Not a DIY job.

Had it in my last house and loved it. House was comfortable and quiet. On my current home we went with extra attention to air sealing and fiberglass. It's not as good but good enough. If I had more money to spend I probably would have spent it on higher quality windows before I spent it on spray foam. Good luck.
schreibdave is offline   Reply With Quote
Old 02-28-2019, 06:31 AM   #26
Property Mgt/Maint
 
Join Date: Mar 2015
Location: Upstate NY
Posts: 5,845
Rewards Points: 6,936
Default

Re: New Construction Spray Foam Insulation


Quote:
Originally Posted by schreibdave View Post
If I had more money to spend I probably would have spent it on higher quality windows before I spent it on spray foam. Good luck.

This is a good point. I have read that 85% a homes heat loss is through doors and windows. While our walls and ceilings are R20 and R40, a typical double pane window is around R3, Even triple pane glass is only about R5.
__________________
[political signature removed]
Yodaman is offline   Reply With Quote
Old 03-15-2019, 06:16 PM   #27
Newbie
 
Join Date: Feb 2019
Posts: 8
Rewards Points: 2
Default

Re: New Construction Spray Foam Insulation


Ok, so if money was no factor, should I go with open cell or close cell in my 2x4 walls? Why?

Update: we are no longer going to DIY this project, thanks largely in part to the input from you fine folks.


Sent from my iPhone using Tapatalk
Velosprints is offline   Reply With Quote
Old 03-15-2019, 07:51 PM   #28
Collector of tools
 
Join Date: Jun 2016
Location: Syracuse NY
Posts: 66
Rewards Points: 126
Default

Re: New Construction Spray Foam Insulation


When we built our last house 11 years ago all of the walls were spray foamed with open cell.

It looks like the current advice for a cold climate is closed cell because of it's vapor barrier properties. It also has a higher R value. Unfortunately it's more expensive too.

schreibdave is offline   Reply With Quote
Old 03-15-2019, 08:04 PM   #29
Newbie
 
Join Date: Feb 2019
Posts: 8
Rewards Points: 2
Default

Re: New Construction Spray Foam Insulation


Believe it or not, a closed cell product has been our lowest quoted price so far! We live in VA, so it can get cold, but nowhere near the northern states. Would you still recommend closed cell?


Sent from my iPhone using Tapatalk
Velosprints is offline   Reply With Quote
Old 03-15-2019, 09:55 PM   #30
Collector of tools
 
Join Date: Jun 2016
Location: Syracuse NY
Posts: 66
Rewards Points: 126
Default

Re: New Construction Spray Foam Insulation


Quote:
Originally Posted by Velosprints View Post
Believe it or not, a closed cell product has been our lowest quoted price so far! We live in VA, so it can get cold, but nowhere near the northern states. Would you still recommend closed cell?


Sent from my iPhone using Tapatalk
I'm not qualified to give that kind of advice. Have you checked out Building Science Corp? They put out research on all sorts of building science issues. the search function on their web site doesn't seem to be working now but here's something I found with google.

https://www.minnesotasprayfoaminsula...Foam-Guide.pdf

It seems to say that in your climate (zone 4) either open cell or closed cell would work. Not sure what they say about the need for a vapor barrier.
schreibdave is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


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
Should I install the spigot before or after the spray foam insulation? rocktop Painting 1 09-12-2017 11:08 AM
What type of spray foam and adhesive is best to use with XPS insulation? Studly Insulation 1 11-01-2014 02:56 PM
Home Energy Audit & Spray Foam Insulation sweets Insulation 7 09-08-2011 11:45 PM
How To Install Rigid Foam Insulation on Concrete earthad1 Building & Construction 9 10-26-2010 10:49 AM
spray foam insulation jdgeorge Building & Construction 2 03-24-2009 06:15 PM




Top of Page | View New Posts