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05-30-2009, 12:24 PM
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#1
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Member
Trade:
Deck builder /contractor
Join Date: Feb 2008
Location: Pa
Posts: 98
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insulating from outside
Any recommendations on insulating from outside? I'm installing new siding and while Im at it ,since I only have 2x4 walls, thought I would try and improve the heat bill. Ive considered P2000, bubble wrap, and just regular 5/8 foam sheets. This is on my own home. I have never done anything like this for a customer, so I have never really researched it before.
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05-30-2009, 12:39 PM
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#2
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strat hd
Trade:
framing contractor , remodeler , GC occasionally
Join Date: Jan 2009
Location: NW Ohio
Posts: 1,682
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 p 2000 insulation
There's a lot of controversy going on about p2000. I was going to use it on a job but changed my mind.
__________________
STRAT HD
Disgruntled citizen of North Mexico !! 
(Formerly the USA)
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05-30-2009, 04:08 PM
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#3
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Bunny by Malco - NY
Trade:
ICF Construction
Join Date: Apr 2007
Location: North of 49
Posts: 2,221
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Wrap the house with 1 1/2" EPS Ship Lap. It's a bit of work to modify the windows and doors but definately an improvement. Make sure you seal really good at the foundation.
__________________
Chris
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05-30-2009, 05:09 PM
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#4
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Pro
Trade:
Carpenter
Join Date: Dec 2008
Location: Saint John, N.B
Posts: 123
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Wrap the outside wall in some extruded polystyrene, tape all joints. Strap and Side it.
If that isn't enough, you can always go to the inside, take the drywall down, strap the walls horzontially over the existing vapour barrier, and insulate the cavity's, then drywall over that. Just remember by code (this is Canadian of course) its all about 3rd's. 2/3 of the wall insulated and vapour barriered, 1/3 can be insulated in front of the vapour barrier.
Should up the R-Value for ya.
-Bill
__________________
You laugh because I'm different...........
I laugh cause I just farted!
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05-30-2009, 05:15 PM
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#5
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Sean
Trade:
General Contractor
Join Date: Sep 2008
Location: Cullman, AL
Posts: 3,419
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What is in the walls now? If there empty, I would look into blown in celluse or slow expanding foam. If the sheathing has to go, maybe strip out the old & see above.
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05-30-2009, 05:38 PM
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#6
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Bunny by Malco - NY
Trade:
ICF Construction
Join Date: Apr 2007
Location: North of 49
Posts: 2,221
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Quote:
Originally Posted by B.K
Wrap the outside wall in some extruded polystyrene, tape all joints. Strap and Side it.
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I believe you meant Expanded PolyStyrene (EPS) not Extruded (XPS)
XPS will 'dry' and shrink leaving gaps between the sheets within a short time
__________________
Chris
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05-30-2009, 05:59 PM
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#7
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King Nothing
Trade:
Remodeler/Builder
Join Date: Jun 2007
Location: Feasterville, Pa.
Posts: 979
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05-30-2009, 06:24 PM
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#8
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Never lost a battle.
Trade:
General contractor, designer, drafter.
Join Date: Sep 2008
Location: Orange County, CA.
Posts: 601
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Excuse a dumb question but why not use R-13 glass?
Andy.
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05-30-2009, 08:41 PM
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#9
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Member
Trade:
Deck builder /contractor
Join Date: Feb 2008
Location: Pa
Posts: 98
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Quote:
Originally Posted by SLSTech
What is in the walls now? If there empty, I would look into blown in celluse or slow expanding foam. If the sheathing has to go, maybe strip out the old & see above.
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the house was built in 1982. 2x4 walls with R13 insulation. However I did tear off the cellulose sheeting on 1 cavity and I guess the original builder just forgot to put insulate that one. 
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05-30-2009, 08:43 PM
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#10
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Member
Trade:
Deck builder /contractor
Join Date: Feb 2008
Location: Pa
Posts: 98
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Quote:
Originally Posted by WarriorWithWood
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Thanks, I remember seeing that article. I will have to dig that issue out.
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05-30-2009, 08:56 PM
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#11
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Pro
Trade:
Carpenter
Join Date: Dec 2008
Location: Saint John, N.B
Posts: 123
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Quote:
Originally Posted by Chris Johnson
I believe you meant Expanded PolyStyrene (EPS) not Extruded (XPS)
XPS will 'dry' and shrink leaving gaps between the sheets within a short time
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Yes thank you, i always seem to get them mixed up.
Sorry about that.
__________________
You laugh because I'm different...........
I laugh cause I just farted!
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06-01-2009, 09:27 PM
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#12
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Member
Trade:
Deck builder /contractor
Join Date: Feb 2008
Location: Pa
Posts: 98
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How about the bubble wrap? Would that help anything installed on the outside of the home?
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06-14-2009, 01:33 PM
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#13
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Registered User
Trade:
Energy Renovation / Masonry
Join Date: Jun 2009
Posts: 5
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Use polyisocyanurate, more commonly known as foil backed board, or high R. this has a R value at installation of around 8 per inch when installed, and drops down to around 7 eventually.
if no insulation exists, I suggest having cellulose dense packed into the wall cavities.
before either of these, AIR SEAL.
Good luck
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