LED lighting--mystery material behind stove?

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Old 01-20-14, 05:42 PM
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LED lighting--mystery material behind stove?

Hello all,

I'm attempting to wire up some under cabinet lighting. In drilling through my basement sub floor up to the 1st floor, I encountered a gray material through the small hole leading to the first floor. I am up, inside the wall cavity (I can feel the drywall on the inside portion) but have some interesting material on the outside wall. I believe I'm in the correct cavity (one to the right of the stove/gas line in my kitchen), but have never seen this material. Is it some sort of fireproofing? Do you think I'm in the wrong cavity?
 
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Old 01-20-14, 06:26 PM
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Can you describe it a little better? So far it's gray. Is it thick, thin, soft, hard....? Can you remove a piece & post a picture, of it or maybe there are some markings, on it?
 
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Old 01-20-14, 06:56 PM
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This is the best I can come up with. It looks like a waterproof membrane to me? Do you think I'm in the correct wall cavity still?
 
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Old 01-20-14, 07:09 PM
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Looks like it might be insulated duct.
 
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Old 01-20-14, 07:36 PM
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I didn't drill into a duct though. Could it be taking up the whole cavity?
 
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Old 01-20-14, 07:44 PM
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You said that you felt drywall, from the inside. If it's a duct that takes the entire space, you didn't feel drywall. To determine if you are in the right spot, take a measurement from either corner, to the cabinet & a measurement from the same corner, in the cellar, to where you are drilling.
 
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Old 01-20-14, 07:49 PM
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That is pretty strange.

A duct is a logical choice but if it was a duct you'd see it in the basement.
How old is the house ?
It looks like old insulation at the top.... almost like a steel wool they uses to use years ago.

Did you try probing it..... can you carefully get a tool thru it
 
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Old 01-20-14, 08:09 PM
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My house is only 7 years old. The drilled through 2 layers of sub floor and a bottom plate. I ended up in this cavity with what appears to be insulation above (fuzzy stuff in the picture).

I doubt it can be any duct because I don't see anything from the basement, and nothing upwards has any duct work there. I have my stove 1 wall cavity left, and a vent for the microwave exhausting to the outside. Doesn't look like it could be anything like that.

I'm wondering if they just used some weird inner layer (almost like a moisture barrier) on the inside of the plywood sheathing for the outer wall.
 
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Old 01-20-14, 08:14 PM
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It almost looks like Dow sill seal.

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Old 01-20-14, 08:25 PM
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But vertically up the wall?
 
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Old 01-20-14, 08:32 PM
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It's hard to tell looking at the picture. It looks like the blue "stuff" is laying on the sill in the pic.
 
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Old 01-20-14, 08:34 PM
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Sure does. Also reminds me of the orange membrane put in bathrooms now a days, just not as thick. It almost looks rubbery.
 
 

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