R-38 Insulation Install - Incorrect Installation

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Old 02-20-2018, 10:58 AM   #1
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R-38 Insulation Install - Incorrect Installation

I was recently called out to a home that was purchased four years ago..contractor bought it to flip. Put an addition and renovated the kitchen and adjoining bathroom. The drawings indicate 2 x 8 roof frame. 3/ 12 roof. No air baffles were noted on drawings. The drawings indicate R-30 fiberglass insulation. This was crossed out and R-38 was written in.

When I looked in kitchen every light fixture (ceiling is raised) including the ones at highest point have water stains, the joint tape is coming off. The accessable attic had 1/4 of frost on every piece of lumber including roof.

I know R-38 cannot be packed into a 2 x 8 roof frame cavity. It creates a moister build up. But WHAT IS THAT CALLED? When insulation is compacted, no air baffles, cold from roof acting on moisture from inside home entering this cavity there is No form of R value BUT What IS IT CALLED? Thank you.
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Old 02-20-2018, 11:28 AM   #2
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Re: R-38 Insulation Install - Incorrect Installation

Pick up the phone and call the architect. They never learn. I swear to they are getting lazy


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Old 02-20-2018, 11:42 AM   #3
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Re: R-38 Insulation Install - Incorrect Installation

I think you might be getting terms mixed up, but the technical term for this manifestation is called Interstitial Condensation.

If you're referring to an unvented roof assembly, sometimes people refer to the as "hot roofs"
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Old 02-20-2018, 06:11 PM   #4
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Re: R-38 Insulation Install - Incorrect Installation

You need to verify what type of insulation the R38 is? Hot roof can't be done with fiberglass alone. Well, maybe, but not in a solid sawn rafter.
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Old 02-23-2018, 11:49 AM   #5
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Re: R-38 Insulation Install - Incorrect Installation

Sounds like a mess.
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Old 03-15-2018, 08:41 PM   #6
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Re: R-38 Insulation Install - Incorrect Installation

Dense pack?

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