Trying to fix air infiltration

freedomeagleOctober 19, 2011

We just bought a Cape Cod that was built in 2005. The home has a two story atrium with two bedrooms upstairs that would be in what is normally the attic area. Each bedroom has one dormer window. The sloped area of the roof between the dormer areas is storage areas that open into the living area. These storage areas are not conditioned but are easily accessible to the living area through a normal closet door.

Each storage area has insulation in the roof rafters and along any outside wall. The inside of these insulated walls is covered with Tyvek over the insulation.So, if you walk into the storage area, you see a tyvek covered wall over the insulation, just a bare studed wall if its on the interior and carpet on the floor.

I am getting some air infiltration in these areas and would like to tear down the Tyvek 'veneer' on the inside and go back with some sort of insulation board. I thought about drywall but it is too bulky and difficult for me to manuever. Since it is storage area, I am really not concerned with the cosmetics. However, I am a little worried about blocking any moisture between the outside wall and the inside if I cover the inside of the exterior walls with foam board or some other inexpensive insulation board.

Anyone have any ideas on whether or not this would be problematic? IF so, what are some other inexpensive alternatives?

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brickeyee

Insulation board itself is not going to reduce infiltration.\

You need to find the gaps and close them.

Canned foam is used to fill larger gaps, even with insulation board.

    Bookmark   October 21, 2011 at 2:19PM
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energy_rater_la

by the sheer size of the insulation board you will stop
a lot of infiltration and heat gain. this is one of the benefit of sheet materials.

install foil faced foam sheathing..I'd put it over tyvek.
use button cap nails to secure to 2x's.

caulk at top and bottom plates. sole plates are never sealed in these areas, caulking will stop air leakage.

make sure that foam covers both plates.
use foil tape to seal all seams holes and joints.

use a razor knife to trim sheathing boards to fit
around any penetrations or wires and caulk to seal holes.

I use caulk more than cans of foam, just tested too many great stuff seals & have seen it deteriorate over the years. caulk conforms to gaps and stays flexible to allow for movement of house. you can buy 25, 35 and 50 year caulks. Dap Alex brand is what I use. (buy the case)

using a foil faced foam board with foil facing into attic space will act as an air, moisture & radiant barrier which will help reduce heat gain thru walls into living space.

I have done this type of install before. if you caulk and air seal as you go it works well. sharp razor knife, button cap nails, straight edge, hammer, caulk & sealants
are all you need. and good light and tunes of your choice.

best of luck.

    Bookmark   October 22, 2011 at 4:14PM
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freedomeagle

Thanks Energy rater. This is perfect, exactly what I was looking for. If I use the 3/4" foil back foam, what length button cap nail should I use. Also, these areas have a pretty steep pitch so it is going to be quite difficult to get between the floor and toe boards to nail. Can I use and adhesive in this area and nail the rest? If so, what kind of adhesive caulk should I use?

Thanks again for your response. Greatly appreciated.

Regards,
Paul

    Bookmark   October 28, 2011 at 4:12PM
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energy_rater_la

1 1/2" button cap nails.
Use construction adhesive, liquid nail or like
product. caulk foam boards at floor..tape seams
caulk everything!
and have fun.

    Bookmark   October 28, 2011 at 5:47PM
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freedomeagle

Got it. Thanks much. I thought of liquid nail but thought maybe the solvents in it would dissolve the insulation board. I already have a case of it so that works.

Thanks again. I very much appreciate your advice.

Regards,
Paul

    Bookmark   October 28, 2011 at 5:55PM
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energy_rater_la

Welcome Paul.
Next we'll have you sealing your return air chase
with ductboard & mastic. LOL!

    Bookmark   October 28, 2011 at 6:05PM
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SpringtimeHomes

Liquid nails will eat right through most foams as will many other caulks. Home retailers should have foam compatible caulk.

    Bookmark   October 29, 2011 at 12:06PM
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freedomeagle

energy_rater, quick question, albeit maybe a dumb one...

Today, the building supply delivered my 1" Foam insulation board. It is Dow TUFF R and it is foiled on both sides. One side, with the Dow printing and disclaimer, is a dull foil while the other side is a bright and shiny foil, similar to aluminum foil you might cook with this.

Since I am putting this up in interior space, I am assuming when you say "foil towards the attic" you are meaning that I put the bright shiny side of the foam board facing toward the exeterior (against the insulation) and the side with the Dow Tuff R printing will be what I will see when I go into the storage areas? Is this correct or should it be turned the other way?

Thanks again for all your advice. Its much appreciated.

    Bookmark   November 14, 2011 at 5:57PM
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energy_rater_la

shinny foil faces you, not the studs. this will allow the foil to reflect heat out of the interior walls like a radiant barrier. if you put the foil in contact with the insulation you lose the radiant quality.
makes it easy to light up the space too.

best of luck.

    Bookmark   November 15, 2011 at 5:54PM
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freedomeagle

Thanks. Just sent you an email.

Regards,
Paul

    Bookmark   November 16, 2011 at 10:40AM
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