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rick32 08-09-2006 02:24 PM

barrier
 
My basement gets a little damp. If i insulate between the rafters overhead, do i need to staple up plastic? I have a butload of questions like this.were selling the house in two years and i want to make sure everything is done right (or close to it ) thanks for your support:thumbsup:

stuccoman 09-06-2006 10:59 AM

If you put up plastic you could have condensation problems there also.

harleysilo 09-06-2006 03:12 PM

Do you know where the moisture comes in from? I'll assume either floor or walls unless your roof leaks. I don't think the plastic will do any good on the ceiling, i assume you are thinking it could protect the insulation, or do you just want to keep it away from the upstairs>?

AtlanticWBConst. 09-06-2006 06:44 PM

Vapor barriers are intended for outside insulated walls. Serious amounts of moisture in a basement will effect the walls first and 'wick' up them. If insulation has a 'paper' face, then that is the vapor barrier, you NEVER want to add another vapor barrier over that, since it then creates a 'chamber' for moisture to build up and stay.

As you wrote, dampness is the issue, and is also common in basements. Do you have a de-humidifier? If not, get one. I use mine all summer long.

KUIPORNG 09-07-2006 10:06 AM

In my case, I used a thick paper type materials (those use for roofing) on the concrete, the put the R12 insulation, then I put in a plastic sheet, then drywalls, on the outer walls(except bathroom).... for bathroom, as the greenboards already have barrier effect, I therefore, will not lay plastic sheets to avoid double barriering..

if I understand AlanticWBConst correctly, I shouldn't have put in the plastic sheet as well... well I feel doing so will give me these advantageous though:

1. keep the insulation hold more frimly.
2. keep the insulation effect better as cold air can further be traped under the plastic even they go through the cotton like materials
3. in case there is minor leaks when super super heavy rains situation, it won't damage the drywall right away, instead stay behind and evaculate after a long period of time...

I understand no barriers can fix leak problems...

fqp25 09-07-2006 12:22 PM

If you put insulation in the floor joist you should secure it with wire mesh. (something like chicken wire) Do not use paper backed insulation. That paper is a moisture barrieer and will trap misture between the first floor and the insulation.

inspects 09-07-2006 04:45 PM

Quote:

Originally Posted by fqp25 (Post 17631)
If you put insulation in the floor joist you should secure it with wire mesh. (something like chicken wire) Do not use paper backed insulation. That paper is a moisture barrieer and will trap misture between the first floor and the insulation.

I also agree. You would be creating a condensation problem with a vapor barrier facing a damp location.


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