Adding Attic Insulation

I'm planning on adding a layer of insulation to the attic. There's an existing ~6" or so on the floor of the attic, between the rafters. It's old and probably the original.
I'd like to add another layer.
Would it make sense to roll out another layer on top of the original at a 90 angle to the rafters, or, put a layer up against the roof and between those rafters?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
snipped-for-privacy@gmail.com wrote:

Sure...
or, put a layer up against the roof and between those rafters?
No.
--
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I'm planning on adding a layer of insulation to the attic. There's an existing ~6" or so on the floor of the attic, between the rafters. It's old and probably the original.
I'd like to add another layer.
Would it make sense to roll out another layer on top of the original at a 90 angle to the rafters, or, put a layer up against the roof and between those rafters?
Adding it over the existing insulation is the way to go. Putting it under the roof will bring up possible problems with vapor barrier and it will increase the temperature of the roof which will shorten the life of the roof.
Note: Take any opportunity to increase the passive ventilation of the attic.
--
Joseph Meehan

Dia \'s Muire duit
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

To follow up on that, I'd suggest the OP replace bathroom fans now if they need to be and vent them to the outside if not already done. Once there's a bunch of insulation up there those projects are not fun.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Most sense? Blow in another 8" of cellulose.
check out www.centralfiber.com for an installer in your area.
steve
I'm planning on adding a layer of insulation to the attic. There's an existing ~6" or so on the floor of the attic, between the rafters. It's old and probably the original.
I'd like to add another layer.
Would it make sense to roll out another layer on top of the original at a 90 angle to the rafters, or, put a layer up against the roof and between those rafters?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Steve Barker LT wrote:

Where did he say the current insulation was cellulose?
--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form snipped-for-privacy@prodigy.net.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Doesn't really matter. Taking the insulation above joist level makes attic useless for storage in any case, so go with whatever is cheapest, which is usually blown-in. It took them less than 2 hours to blow 1400 sq feet for me, including setting the tube things for the soffitt vents. The 50 cents a square foot it worked out to was well below the bids for rolled-out batts. I was afraid of it blowing around and drifting, but so far that hasn't been a problem, even in one windstorm that sucked the hatch cover right off the attic hatch in the garage.
aem sends....
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
They stuff they used in my house is called "stablilized" They actually spray water on with it, like as if they were doing unfinished walls, (about half as much water though) and it makes it stick to itself. #1. It prevents blowing around, #2. It doesn't settle.
steve

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

It does not matter. The blown in cellulose has some real advantages and tends to reduce air infiltration.
--
Joseph Meehan

Dia \'s Muire duit
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
they didn't.
s

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.