I have a couple rooms upstairs that get fairly hot in the summer so I suppose its a good time to re-insulate. the walls to the bedroom I have access to in the attic. I will install insulation in between the studs but wanted to know if it is a good idea to put a double layer on the wall. I was gonna make a horizintal run as well as vertical. this would completely blanke the wall. Just dont understand about vapor lock and if the paper need to go in or out while double layering
Thanks in advance
I am not at all sure what you are talking about "double layering."
Vapor barriers always go on the warm side and you never use more than one.
The first run should have the paper towards the "hot in winter" side. The second layer should have no paper. I'd seriously consider sprayed in place cellulose. They can make it as thick as you please. In my case, it was only a couple hundred dollars more (for a whole house) than buying the fiberglass and doing it myself. This is the parent company my product came from, some good info here:
This is a 2 story. I already ahve insualtion on the ceiling or in the attic for the celings. It is blow in.
I need to replace the insualtion that is for the walls of the bedrooms upstairs. I have access to all that in my attic. The insualtion now is in place in betwwen the 2 x 4's runnig up and down
I am going to get a better R value and replace the insualtion for the bedroom walls. This will go up and down. Is it a good idea to run another row of insualtion that goes left to right . This will completely blanket the walls. Including where the vertical insualtion will be on the walls that wont cover up the 2 x 4 studs.
I am not sure what you are planning here. Are you saying you are going to add an additional layer of insulation over that already in the wall. Are you then going to build a new wall further into the room over that additional insulation? You can do this, but, depending on the type of insulations and the local climatic conditions and your price of fuel, it may not help much. Is the insulation that is there (in the wall) already covered by a finished wall? There is a lot of work to do that work. I did it once on a brick home.
If you are planning to add additional insulation then I would build the new wall with the studs offset. That would result in the best insulation. Also cut any existing vapor barrier that is in that wall to prevent condensation inside the new wall. You want one and only one vapor barrier and you want that on the warm side of the wall.
All of the above is assuming you are talking about living space. If you are talking about an attic that is not used as a living space, just do the floor of the attic and don't do the roof or walls, allow ventilation up there to keep it dry.
Sure.
But not worth doing, vs horizontal studs with small crossing contact areas.
Nick
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