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Mark Harvey 01-08-2013 08:09 PM

Exterior insulation
 
For a re-siding job using vinyl over wood, my clients wants added insulation. I know of a wrap type (Krona) and several sheet type materials (Plasti-span & Silver foam, etc.). All claim to be the best and should do the job. What would be your recommendation and why? thanks.

Windows on Wash 01-08-2013 11:14 PM

Depends on the interior wall construction and what is behind the wood siding.

You don't want anything that is a Class I vapor retarder if you have and interior one because it won't dry to either side.

More details are required.

jagans 01-09-2013 08:53 AM

Adding insulation like that does not accomplish much because it is non contiguous. Air infiltration voids the gain. It helps support the siding though. EIFS is another story. I would check out the house with an IR camera and tell them where they are suffering heat loss. You would be surprised how much you can lose around a poorly set door, holes in the foundation etc. etc.

Poor windows are usually the real culprit.

Windows on Wash 01-09-2013 03:35 PM

Quote:

Originally Posted by jagans (Post 1089615)
Adding insulation like that does not accomplish much because it is non contiguous. Air infiltration voids the gain. It helps support the siding though. EIFS is another story. I would check out the house with an IR camera and tell them where they are suffering heat loss. You would be surprised how much you can lose around a poorly set door, holes in the foundation etc. etc.

Poor windows are usually the real culprit.

Big +1 :thumbsup:

If I had a wooden nickel for every BS insulated siding claim...I would be a rich man.

Well said James.

Mark Harvey 01-09-2013 03:48 PM

siding
 
Gents, I appreciate tyour replies. The building is a cottage, 800 sq. ft., 2x4 construction with the old aluminum slider windows. It was purchased by a young fellow (first house) and he is finding the heating bills to be on the high side. His call to me was about insulation and siding. I am strongly suggesting window replacement and additional attic insulation (now R12). Where I am the recommended amount for the attic is R 40 or better. If he still wants to add insulation and new siding, I'll do it but any other ways to insulate the place better would be his primary desire. Suggestions?

Mark Harvey 01-11-2013 07:32 PM

Re-siding options
 
I have received some replies but am looking for opinions on the best way to re-side a small house. My client wants to re-side over existing wood siding and add some type of insulation between the old siding and the new vinyl siding. The more I look into options the more negatives I hear. The house is 2x4 construction with the old aluminum slider windows. What I proposed is , first ... replace the windows with updated weather tight windows. Next is to add attic insulation (currently R12) to R 40 or better. Then the walls.??? I'd prefer to strip the old siding off, check the R value of the existing walls, add insulation and re-side. I'm not convinced that siding over existing siding is the best way to go. One reason is that there is still a void between the two siding surfaces (wood & Vinyl) even though there would be some type of insulation between the two. The primary conern seems to be the insulation ... or lack of. I just want to do the client the best for them. All suggestions are very welcome.

Windows on Wash 01-11-2013 08:00 PM

I think you are right. Best to pull the exterior cladding and get intimate contact to the wall surface.

joecaption 01-11-2013 08:12 PM

And it's always best to replace the windows before the siding.
There going to save more money in HVAC cost by just doing that then the whole siding job.

r.mills 01-12-2013 12:40 AM

I used to side houses 12 years ago. On a 2x4 framed house going to vinyl we always convinced home owner to replace all windows with vinyl 2x6 windows, then stripped off wood siding, added 2" T&G rigid styrofoam, tuck taped seams then put vinyl siding over that. Need like 3.5" nails I think after.

woodworkbykirk 01-12-2013 02:48 PM

we only use 1 " foam here. a while back several builders were using 2" foam but were having major issues with the siding sagging after a short period of time. the foam doesnt support the siding nail from drooping under the weight of siding. even more so with wood siding and fibre cement.. so its no longer allowed

Mark Harvey 01-12-2013 03:15 PM

siding
 
If I were to go with the 1" insulation, there would be a gap between the siding and the outer edge of the 2x6 window frame. How did you account for this?

Mark Harvey 01-12-2013 03:16 PM

Is there a better way to lessen the possibility of sagging siding?

joecaption 01-12-2013 03:56 PM

I guess it's just me but I'd never suggest using that thick a foam, in fact I'd avoid it. Reason being the vaper barrier needs to be on the inside not the outside.
Only time I've used foam is fan fold over old siding to level out the wall.
Using foam that thick you would have to build out ever bit of trim around every door window to make up for the space and use 3" roofing nails.

Mark Harvey 01-12-2013 04:27 PM

siding
 
Joe, What would you suggest if not the foam board?

joecaption 01-12-2013 04:36 PM

Just Tyvek or insulated siding.
Once they see the price of insulated siding they may change there mind.
You would need to use 1" J mouding and out and inside corners.


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