On 12/9/2010 8:07 AM, jamesgangnc wrote:
On Dec 9, 5:18 am, wrote:
On Dec 8, 2:02 pm, "Ed wrote:





wrote in message

...

I've been working on my garage project and I'm about to the point of
installing insulation on the garage ceiling. The joists between the
living space above and the garage are 22" inches tall and manufactured
from 2x4's. Inside them is the plumbing, electrical and most of the
hvac flex ducts for the room above. I also plan on insulating the
garage walls. I have insulated garage doors on the front and back but
the front one is big, 20x9. The subfloor above is tongued osb.

Does it really matter which way I put the facing on the insulation
between the garage ceiling and the floor above? I know the vapor
barrier is supposed to be against the floor but i's going to be a
whole lot easier to install it with the paper on the garage side as
that will let me staple the paper to the bottom of the joists.
Otherwise I have to figure a way to hold the insulation up while I
install wallboard on the ceiling.

Easier is not always better, or even acceptable. Vapor barrier to the
heated side or potential problems Thee are metal supports made for holding
insulation in place between joists. .

Better applications is to have someone come in and do spray foam.

The insulation can be held up by stiff springy metal wires that are
sold at various supply stores. They are about the size off a coat
hanger and come in different lenghts. These wires will hold up the
insulation by being inserted between the floor joists. Easy to do, no
tools, inexpensive.

Hank- Hide quoted text -

- Show quoted text -

Yes, I know about insulation wire supports. These are open web
trusses centered on 24". That makes the open space between trusses 20
1/2". I'll have to cut 24" wires down a bit. And carefully place
them on the lower edge of the truss. I'm wondering if there might not
be a better solution than the wires. For what it's worth the
insulation is in 4' batts.


I have an old house with uneven joist spacing. What I do is
temporarily push up the insulation and zig zag (sort of, I run across
and zag) staple fence wire to keep up the insulation. You can staple the
wire to the inside of the joist. You can cut insulation to fit the gap.
It's a pain cutting it and I usually use a large paper cutter and chop
my way through.

Vapor barrier is supposed to go to the heated side. In a hot climate
that may change how it is installed.

Jeff