I Have A "Poor Man's Spray Foam" Question - Insulation - 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!

Reply
 
Thread Tools Display Modes
Old 08-17-2011, 09:39 PM   #1
Newbie
 
Join Date: Jun 2011
Location: On the High Line in MT
Posts: 9
Rewards Points: 10
Default

I have a "Poor Man's Spray Foam" question


I'm looking to do the "Poor Man's Spray Foam" as seen in one of HomeInsulation's youtube videos.

My walls are only 2x4's. I live in one of the coldest places in the US. Last winter we were the coldest place in the US one day at -59. I'm going to be doing this to about 1/3 of my home's exterior walls while renovating a kitchen and living room.

The question I have is can I put both a 2" piece and a 1" piece of Tuff-R on top of each other for an R value of about 19.5? Or will this cause condensation problems or some other problems I'm not forseeing?

Thanks!

Advertisement

Skull Leader is offline   Reply With Quote
Old 08-18-2011, 12:43 PM   #2
Member
 
AGWhitehouse's Avatar
 
Join Date: Jul 2011
Posts: 1,378
Rewards Points: 500
Default

I have a "Poor Man's Spray Foam" question


This is a tough installation to complete effectively and you still have a 1/2" void that allow for convective air currents. You'll also have alot of waste with the custom cuts, which is very costly garbage.

Below is a comparison of two systems...Noting the different R-values, I think you'd be better off in installation time, $, and stress level to fill the bays with unfaced batts. and sheath the wall with 1/2" foil-faced polyiso before you sheetrock. The foil-face with taped seams and penetrations will give you the air and vapor barrier needed while greatly reducing the thermal bridging that the studs create.

A whole different approach is to sheath the exterior of your house with nail-base foam panels. This would require re-siding, so I'm not sure if this is even in your deck of cards.

OOPS...done quick and without great review, the titles of the charts are backwards. The cut foam scenario is on the right...

Advertisement

__________________
Life's too short...so enjoy it!

Last edited by AGWhitehouse; 06-19-2013 at 02:59 PM.
AGWhitehouse is offline   Reply With Quote
Old 07-14-2015, 09:47 PM   #3
Newbie
 
Join Date: Sep 2014
Location: MN, USA
Posts: 2
Rewards Points: 4
Default

I have a "Poor Man's Spray Foam" question


Quote:
Originally Posted by AGWhitehouse View Post
Below is a comparison of two systems...Noting the different R-values, I think you'd be better off in installation time, $, and stress level to fill the bays with unfaced batts. and sheath the wall with 1/2" foil-faced polyiso before you sheetrock. The foil-face with taped seams and penetrations will give you the air and vapor barrier needed while greatly reducing the thermal bridging that the studs create.
Is this technique agreeable? I know this is an old post but I've been considering this idea, the one in the original post and plenty of others for insulating.
bowlofkibble is offline   Reply With Quote
Old 07-15-2015, 02:29 AM   #4
Member
 
GeselleBrian's Avatar
 
Join Date: Apr 2015
Posts: 34
Rewards Points: 2
Default

I have a "Poor Man's Spray Foam" question


can you not just stuff the wall with Fiberglass or Rockwool?
GeselleBrian is offline   Reply With Quote
Old 07-16-2015, 08:07 PM   #5
Newbie
 
Join Date: Sep 2014
Location: MN, USA
Posts: 2
Rewards Points: 4
Default

I have a "Poor Man's Spray Foam" question


Quote:
Originally Posted by GeselleBrian View Post
can you not just stuff the wall with Fiberglass or Rockwool?
Of course that is an option, but air sealing seems to be kind of a big deal it seems and using these techniques makes the idea of air sealing much easier to fulfill. There is a video titled "Attic Insulation Done Wrong… and How to Do It Right!" (unable to post links) that might help illustrate this idea a bit.
bowlofkibble is offline   Reply With Quote
Old 07-16-2015, 08:15 PM   #6
Member
 
Join Date: Nov 2014
Posts: 356
Rewards Points: 716
Default

I have a "Poor Man's Spray Foam" question


Air seal with expando foam, THEN put batts of insulation in The way whitehouse suggested with unfaced & foil ontop might give you better insulation.

However, faced batts of insulation will give you plenty of insulation for likely a much cheaper price. If we are going the "poor mans" route, that would likely be the cheapest & work just fine.

I understand fully about insulation. Hell my walls have outer sheath, 3/4" foil board, tar paper, inner sheath, R-13 insulation, sheetrock & cedar slats.. Dunno the exact R value but I am sure it is high. Overkill but...I stay cool in summer & warm in winter. I tried the poor mans insulation route for under my floor but was more trouble than it was worth.

Advertisement

Hick is offline   Reply With Quote
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
spray or brush baseboards? mathdan Painting 20 06-05-2015 09:41 PM
Spray foam insulation troyce1 Insulation 12 12-14-2014 06:30 AM
using XPS and spray foam together in stud bay diybrad Building & Construction 5 08-06-2011 08:08 PM
Basement Renovation Question KUIPORNG Remodeling 234 08-26-2008 08:19 AM
hrv question indep HVAC 3 07-17-2008 10:39 PM




Top of Page | View New Posts