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Old 03-10-2018, 04:44 PM   #1
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New Attic access panel - insulation


Hi,

The attic access 20" x 20" dry wall panel broke. I'm thinking about this for a replacement:

- get a 1/2" plywood cut and paint to match attic access opening and paint color

For the insulation,

the old dry wall panel has something like the blown-in type insulation glued to one side. I wonder what's a good choice for the insulation I put behind this new access panel piece. Don't really want to pull out that old dusty insulation and reuse.

Is something like R6.7 denim Insulation good enough, or I need something better?

https://www.homedepot.com/p/UltraTou...6482/202709974


Would be great if folks can post a link to the right product if this isn't the right one to use. Just need to get a piece so a small roll is good enough.


Thanks.
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Old 03-10-2018, 05:33 PM   #2
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Re: New Attic access panel - insulation


I have a foot of XPS over my attic hatch. Plus closed cell foam strip on the periphery to make sure its air tight.
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Old 03-10-2018, 05:47 PM   #3
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Re: New Attic access panel - insulation


2" XPS will give you R10, layer it to get the required R value for your area.
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Old 03-25-2018, 10:16 PM   #4
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Re: New Attic access panel - insulation


I just read the note on the XPS board:

"This product is combustible. A protective barrier or thermal barrier is required as specified in the appropriate build code."


So do I need to get something on top of/around the XPS board to protect it from combustion?

Last edited by joemc3; 03-25-2018 at 10:26 PM.
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Old 03-26-2018, 06:15 AM   #5
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Re: New Attic access panel - insulation


I use a plywood sheet, cut to fit, with whatever insulation is in the attic stuck on top of it .

Batts, foam board, the denim you link to, or other.

Put a weather strip on the bottom to seal it to the joists, paint to match the ceiling.


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Old 03-26-2018, 06:57 AM   #6
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Re: New Attic access panel - insulation


Quote:
Originally Posted by joemc3 View Post
I just read the note on the XPS board:

"This product is combustible. A protective barrier or thermal barrier is required as specified in the appropriate build code."


So do I need to get something on top of/around the XPS board to protect it from combustion?

You could also glue drywall to the XPS
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Old 03-26-2018, 08:41 AM   #7
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Re: New Attic access panel - insulation


You may want to look at the following KARP Associates they have access hatches for all types of finish. The KSTDW is for drywall the panel is recessed for drywall to be placed in.
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Old 03-26-2018, 04:33 PM   #8
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Re: New Attic access panel - insulation


Quote:
Originally Posted by Yodaman View Post
You could also glue drywall to the XPS
So the XPS board would be sandwiched between the drywall (facing the attic) and the plywood (facing the ceiling) in order to cover it up on both sides of its surfaces?

How about along the edges of the XPS board?

I'm trying to understand if the XPS board needs to be 100% sealed around all 2 surfaces plus 4 edges.

It seems a lot of work here just to use XPS board... . Are there sealed XPS boards so no need to do all this work to seal around the surfaces? Or I'm misunderstanding this?
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Old 03-26-2018, 05:26 PM   #9
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Re: New Attic access panel - insulation


Quote:
Originally Posted by joemc3 View Post
So the XPS board would be sandwiched between the drywall (facing the attic) and the plywood (facing the ceiling) in order to cover it up on both sides of its surfaces?

How about along the edges of the XPS board?

I'm trying to understand if the XPS board needs to be 100% sealed around all 2 surfaces plus 4 edges.

It seems a lot of work here just to use XPS board... . Are there sealed XPS boards so no need to do all this work to seal around the surfaces? Or I'm misunderstanding this?


Technically you are not allowed exposed foam anywhere within the home. Personally I have never seen a building inspector get cranky over a small amount of edge foam. I would probably use drywall on the bottom so it would be facing the interior and call it good. Reinforce the drywall with lumber if needed to keep from sagging.
If you think foam is going to be a issue stack up fiberglass lieu of. Use paper backed so you could staple the paper down.

Last edited by Yodaman; 03-26-2018 at 05:28 PM.
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