Home>Discussions>INSULATION & HVAC>plastic sheeting on attic roof underside
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susie67
plastic sheeting on attic roof underside

we bought a house built in 1941 in washington dc suburb, the roof of the attic has plastic sheeting tacked up underneath on the inside, not the floor of the attic but on the roof, any ideas why?

jkirk
Re: plastic sheeting on attic roof underside

this is a vapor barrier it keeps warm air from escaping the house which in turn reduces heating costs

Gizmo
Re: plastic sheeting on attic roof underside
jkirk wrote:

this is a vapor barrier it keeps warm air from escaping the house which in turn reduces heating costs

Ditto what jk said.......
your plastic has somewhat of the same concept as the products below......

http://www.ecofoil.com/Applications/Attic-Insulation

http://www.atticfoil.com/radiant-barrier-methods.htm

Brookworld
Re: plastic sheeting on attic roof underside

My (1965) house is cape cod style (where the 2nd floor is part of the attic) and has dormers that serve as windows. When I look at the plywood roof substrate, I see roofing nails through it, but no "plastic sheeting".

The attic has fiberglass insulation along the (living space) walls and the floor (ceiling of the main 1st floor).

In the summer, the 2nd floor has a "baked" quality to it because it sits so close to the roof surfaces. In the winter, the water pipes are a concern to me as they are in the attic.

What can I do to better insulate for both summer & winter ?

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