Insulation Method 2x4 Walls? - Remodeling - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 06-29-2010, 10:57 AM   #1
Newbie
 
Join Date: Apr 2009
Posts: 27
Rewards Points: 25
Default

Insulation method 2x4 walls?


Gutted our den, which apparently used to be a porch, 3 or 4 season at some point. The insulation used to be R-11 fiberblass, aluminum foil faced batts, and then at some point they blew in cellulose on top of that.. some stud cavities were tightly sealed, but most were a mess with the fiberglass sagging and all sorts of insects living in them. Already found one batch of carpenter ants and the search for the nest is still on.

3 walls are exterior, 2x4 over a concrete slab. The room is freezing in the winter so I'm trying to do my best with insulating. First quote from spray foam is over $1200... given the cost of fiberglass batts and a few cans of Great Stuff for the visible cracks in the bottom sill and electrical holes, i don't know if that's worth the cost. I understand there are R-15 batts for 2x4 walls now, so do you think if I got paper-faced R-15 batts I should be in pretty good shape? I'm in Connecticut.


Advertisement

chigundo is offline   Reply With Quote
Old 06-29-2010, 11:02 AM   #2
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

Insulation method 2x4 walls?


What did they give you for an Rvalue on the spary foam ?
I'd bet the concrete slab is where you are losing most of your heat
If the ceiling is high enough I'd consider a floor w/insulation added

I used R15 on our 2nd floor existing walls & a few other places
Worked for me

Advertisement

Scuba_Dave is offline   Reply With Quote
Old 06-29-2010, 11:06 AM   #3
Newbie
 
Join Date: Apr 2009
Posts: 27
Rewards Points: 25
Default

Insulation method 2x4 walls?


Before we gutted, the floor was carpet.... concrete, carpet pad, carpet.

It sucked. The ceiling height is 7 1/2 feet right now..not sure how we can insulate the floor at ALL let alone properly.. any tips in that department would be appreciated. We were thinking an engineered wood/laminate flooring instead of carpet.
chigundo is offline   Reply With Quote
Old 06-29-2010, 11:29 AM   #4
Member
 
Join Date: Mar 2010
Location: New York
Posts: 1,763
Rewards Points: 40
Default

Insulation method 2x4 walls?


I second addressing the concrete floor problem. What about furring out your walls with 2x2's interiorly to give you an adaquate 6" wall?
Jim F is offline   Reply With Quote
Old 06-29-2010, 11:33 AM   #5
Newbie
 
Join Date: Apr 2009
Posts: 27
Rewards Points: 25
Default

Insulation method 2x4 walls?


Do you think a 1/2 inch rigid foam board directly over the concrete will be a big enough improvement ?
chigundo is offline   Reply With Quote
Old 06-29-2010, 11:34 AM   #6
Newbie
 
Join Date: Apr 2009
Posts: 27
Rewards Points: 25
Default

Insulation method 2x4 walls?


realistically trying to make the room as insulated as possible without really shrinking it anymore than we need too, considering it's not terribly big to begin with

there's that fine line trying to find
chigundo is offline   Reply With Quote
Old 06-29-2010, 12:21 PM   #7
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

Insulation method 2x4 walls?


Ah, somehow the walls looked taller in the pic
I've never put rigid on the floor, but have seen it done on TV
Not sure on the method, results etc
Scuba_Dave is offline   Reply With Quote
Old 06-29-2010, 01:21 PM   #8
General Contractor
 
Join Date: Aug 2009
Location: Seattle, WA
Posts: 67
Rewards Points: 75
Default

Insulation method 2x4 walls?


I would identify the cause of those carpenter ants, that means there is way too much moisture in the walls, you may have a leak somewhere.

There's three methods of vapor barrier that I've seen and used:
- Faced insulation
- Unfaced insulation with plastic stapled to the walls
- PVA primer

My preferred method is PVA, that way you are totally covering the walls with a vapor barrier.

As for the floor, there is a company in Canada that manufactures insulated floor tiles for what you are doing. I've never tried them, but you can take a look here http://www.ovrx.com/basement-flooring.html
KennMacMoragh is offline   Reply With Quote
Old 06-29-2010, 10:17 PM   #9
Registered User
 
Join Date: Mar 2009
Posts: 9,986
Rewards Points: 2,038
Default

Insulation method 2x4 walls?


You lose twice as much through the walls as the floors. http://www.explainthatstuff.com/heatinsulation.html

Tape a 2' square piece of clear plastic on the floor, check for moisture after 2 days. This will possibly tell if there is a vapor barrier under the slab (highly unlikely).

At time to cover, seal the wall/floor joint with caulking, caulk the drywall everywhere against air: http://www.buildingscience.com/docum...wall-approach/
Seal the sheathing/bottom plate joint with caulk to stop air/bugs.
Plug each wire hole with foam to stop air movement: http://oikos.com/library/insulating_...lls/index.html
As mentioned by Jim F, furring the walls , or at least adding foam board directly to the studs after batts for a thermal break: http://www.coloradoenergy.org/procor...f/r-values.htm

1. Why are the top plates installed short of the ceiling?
2. Did you find any moisture in the stud bays?
3. Is the bottom plate of treated wood? http://www.greenbuildingadvisor.com/...-building-code
4. Can you see a sill sealer under the bottom plate? http://www.lowes.com/lowes/lkn?actio...248&lpage=none

Be safe, Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 06-29-2010, 10:31 PM   #10
Newbie
 
Join Date: Apr 2009
Posts: 27
Rewards Points: 25
Default

Insulation method 2x4 walls?


1. Why are the top plates installed short of the ceiling?
-Good question, no idea. I'll be removing the ceiling drywall tomorrow to see what else is up there.. what are the problems with how it is now?

2. Did you find any moisture in the stud bays?
-None, the stud bays seemed pretty dry. If there was any evidence of moisture, it was towards the bottom in some stud bays and that's where you could see outside looking between the bottom sill plate and the exterior sheeting.

3. Is the bottom plate of treated wood?
-I think so, and I only say that because there's no sign of rot.

4. Can you see a sill sealer under the bottom plate?
-No and I highly doubt there is one considering when this could have been built.

Advertisement

chigundo 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
Questions about insulation in basement remodel BillG Remodeling 1 04-27-2010 09:15 AM
Paint options for basement walls and floors 68tele Painting 8 10-28-2009 07:09 PM
Furring out walls for insulation? ddave23 Building & Construction 2 10-12-2009 04:14 PM
Foam insulation in old walls bmoss1973 Remodeling 4 03-18-2009 12:32 PM
basement renovation yummy mummy Remodeling 156 05-08-2007 11:15 AM




Top of Page | View New Posts