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o boogie
Premium
join:2004-12-15
Central TX

Insulative Sheathing under aluminum siding ?

I'm planning on blown-in insulation in the wall bays in this old house.

The old Alcoa Alum. siding will be removed to access the original outside wood sheathing, then re-installed.

An so, I'd like ideas for adding some sort of extra insulating material under the Alcoa siding. An estimating contractor believes there is some sort of 'nominal' (some type of thin foam-board) treatment that was originally installed under the siding.

If there exists a good practice for this idea, I'd just as well add it while I'm at it.
I'm a big believer in radiant barriers in attic applications, are radiant barriers OK for this application?

Thanks in advance.


John97
Over The Hills And Far Away
Premium
join:2000-11-14
Spring Hill, FL
kudos:1
Are you planning on adding Tyvek house wrap?


mattmag
Premium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3
reply to o boogie


You may want to use caution on that idea, as anything that makes the house "thicker" could possibly end up meaning your corner trim will no longer cover the edges of the siding at the corners.


cowboyro
Premium
join:2000-10-11
Shelton, CT
reply to o boogie
A radiant barrier sandwiched between other materials will do next to nothing.

robbin
Premium,MVM
join:2000-09-21
Leander, TX
kudos:1
reply to o boogie
The problem in adding insulation is that the siding will be spaced out from the house and no longer fit as before. I can see problems at corners, windows and doors, etc. The insulation currently under is probably the 1/4" blue board. You may be able to use the bubble wrap type insulation with the mylar reflective sides in place of what is there now. It is about the same thickness but not sure how much insulation value it would add. I have had good results with it in other applications and it is a radiant/thermal barrier.


o boogie
Premium
join:2004-12-15
Central TX

1 edit
reply to John97
Well, I do not know. That is why I'm seeking opinions.

Just returning from scouting the outside. I do believe there is some thin (~ 1/2 " ) material that is indeed just under the Alum. siding.
Since the siding has been up for over 25 years I bet whatever the material is , it has no radiant properties (like the modern material i see at the big box stores, with a reflective laminate on one surface).


mattmag
Premium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3


You need to be aware of the situation robbin See Profile and I are speaking of. If you are able to replace the existing material with something newer of the same thickness, you should be OK. Anything that adds thickness is going to cause trouble.


SparkChaser
Premium
join:2000-06-06
Downingtown, PA
kudos:4
Reviews:
·Verizon FiOS
reply to o boogie
There should be sheathing under most of the siding and plywood in the corners. (If it's like my builder) I did what you are suggesting and had a pro, (using the term loosely) do the job of adding additional board insulation to the house and then siding.

The main problem is that he had trouble fastening the siding to the new double layer of insulation and sheathing. I didn't find out until a few years later when the siding started blowing off.

I think the proper way would be to replace the sheathing with the insulation board.
--
"Facts do not cease to exist because they are ignored." - Aldous Huxley

"The good thing about science is that it's true whether or not you believe in it." - Neil deGrasse Tyson


nunya
LXI 483
Premium,MVM
join:2000-12-23
O Fallon, MO
kudos:13
Reviews:
·Charter
·voip.ms
reply to o boogie
I am *really* curious as to how they plan on removing old aluminum siding and re-installing it.

I've had houses with aluminum siding. First, I can't imagine why you would want to put it back up. Second, it seems like it would add quite a bit to the cost of labor vs. "rip and rebuild".

I've removed aluminum siding. It scratches, dents, kinks, and "rubs off" (the paint) very easily. It's nearly impossible to get off without damaging it.
We have too much hail around here, so AL siding doesn't really stand a chance. It's not very common. It seems like it was a "70's thing".
--
If someone refers to herself / himself as a "guru", they probably aren't.


Ken
Premium,MVM
join:2003-06-16
Markle, IN
reply to o boogie
said by John97:

Are you planning on adding Tyvek house wrap?

Yes what's the plan on house wrap? A properly installed air barrier will do far more for energy efficiency in an old home than an extra 1/2" of insulation could ever hope to accomplish.