Attic Insulation - Plastic beneath/above fiberglass?
 

My ceiling "layer", starting from the bottom;
- drywall (the ceiling you see from the bedrooms)
- plastic sheeting
- fiberglass insulation, a thick layer

I'm wondering - would it be helpful/desirable to have another layer of
plastic on TOP of the fiberglass insulation? Or am I already good?

Not an insulation expert, and just want to make sure I would be
benefiting my energy bill, and not creating a vapour/condensation
issue.

Attic Insulation - Plastic beneath/above fiberglass?
 

You're good.

And you really don't to create a double vapor barrier.

That's not good.

Attic Insulation - Plastic beneath/above fiberglass?
 

Paul wrote:
My ceiling "layer", starting from the bottom;
- drywall (the ceiling you see from the bedrooms)
- plastic sheeting
- fiberglass insulation, a thick layer

I'm wondering - would it be helpful/desirable to have another layer of
plastic on TOP of the fiberglass insulation? Or am I already good?

Not an insulation expert, and just want to make sure I would be
benefiting my energy bill, and not creating a vapour/condensation
issue.

No and you only want one and unless you are in the deep south or
somewhere that is very warm, it is where it belongs now. You can add
insulation above as you like, but it should not have a vapor barrier
included or the barrier should be cut to allow moisture to pass.


--
Joseph Meehan

Dia 's Muire duit

Attic Insulation - Plastic beneath/above fiberglass?
 

On Mar 19, 6:51 pm, wrote:
You're good.

And you really don't to create a double vapor barrier.

That's not good.

Thank you

Attic Insulation - Plastic beneath/above fiberglass?
 

On Mar 19, 9:38 pm, "Joseph Meehan"
wrote:
Paul wrote:
My ceiling "layer", starting from the bottom;
- drywall (the ceiling you see from the bedrooms)
- plastic sheeting
- fiberglass insulation, a thick layer

I'm wondering - would it be helpful/desirable to have another layer of
plastic on TOP of the fiberglass insulation? Or am I already good?

Not an insulation expert, and just want to make sure I would be
benefiting my energy bill, and not creating a vapour/condensation
issue.

No and you only want one and unless you are in the deep south or
somewhere that is very warm, it is where it belongs now. You can add
insulation above as you like, but it should not have a vapor barrier
included or the barrier should be cut to allow moisture to pass.

--
Joseph Meehan

Dia 's Muire duit

Thank you

Attic Insulation - Plastic beneath/above fiberglass?
 

On 19 Mar 2007 11:46:48 -0700, "Paul" wrote:

My ceiling "layer", starting from the bottom;
- drywall (the ceiling you see from the bedrooms)
- plastic sheeting
- fiberglass insulation, a thick layer

I'm wondering - would it be helpful/desirable to have another layer of
plastic on TOP of the fiberglass insulation? Or am I already good?

imho:

Plastic it to prevent the migration of moisture through the
insulation. So a second layer would trap moisture inbetween the
sheets. Mold, poor insulation, etc, bad idea.


Not an insulation expert, and just want to make sure I would be
benefiting my energy bill, and not creating a vapour/condensation
issue.

Understood, niether am I, just passing on information shared with me,
when I upgraded my attic insulation.

later,

tom @ www.FindMeShelter.com