spray foam insulation vs. R-30 rolls

Reply

  #1  
Old 12-10-10, 07:55 AM
Member
Thread Starter
Join Date: Dec 2008
Location: Washington PA
Posts: 178
spray foam insulation vs. R-30 rolls

Hi, I have a 3 to 4ft high crawl space under my kitchen and laundry room. the area is about 20x24. There are 2x10floor joists with R-19 faced insulation now. Some of the insulation is falling down, and I need to do some baseboard heater piping under there which means more insulation will have to be pulled down. I am trying to get help on what I should put back up.

I see there is R-30 insulation that will fit that joist depth available, and I have seen on t.v (holmes on homes) that there is spray foam insulation.....which looks way easier. Anybody know what the R value is on that foam and is it reccomended?

thank you in advance

Ed
 
Sponsored Links
  #2  
Old 12-10-10, 08:17 AM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 20,977
Spray would be the most efficient...but it's pretty costly. The kits you can buy start at around $500 I think and you would need to buy the chemicals.

The one problem I see with it is when it's time for a pipe or electrical repair.
 
  #3  
Old 12-11-10, 05:15 AM
Member
Thread Starter
Join Date: Dec 2008
Location: Washington PA
Posts: 178
thanks for the advice. I did check out a local company....$1300 for 5" thick on a 15 x 15 space. I think r 30 rolls will be fine..
 
  #4  
Old 12-16-10, 07:49 PM
Member
Join Date: Mar 2009
Location: WA
Posts: 1,167
You know the R-30 rating is in the lab with all six sides covered and no outside air touching..... I'd add some rigid foam board to protect the joist bottoms or at least some house wrap stapled to sill sealer on them first: BSI-009: New Light In Crawlspaces — Building Science Information

Gary
 
  #5  
Old 12-17-10, 08:25 AM
Member
Join Date: Oct 2008
Location: New England
Posts: 9,994
If you watch some of Mike's (Holmes) shows, you will see them using a mineral wool, much denser than the typical fiberglass. I would still cover it down there as Gary suggests and in my experience I suggest something substantial that can stop critters. All of that insulation makes great nesting material, so either mouse proof the area or seal that insulation.

Bud
 
Reply

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


Thread Tools
Search this Thread
Display Modes