Hi, I want to insulate the ceilimg in the basement of my house. The
ceilings are about 7' high or a little lower.
It consist of exposed rafters 10" high 2" thick and spaced 12" apart above
that is wood subflooring the finished flooring.
This summer I'll be installing some wiring below the floor so whatever I
install now I'll have to remove some of it for the wiring installation this
I neglected to state I live in the mid atlantic region, Baltimore, and there
is no furnace in the basement only a gas fired water heater for a heat
source. Earlier today the temp was 48 degrees in the basement. It's got
electric baseboard heat
but I only use it when the outside temp is below 20 degreee F for extended
Typically, if you will be heating all the spaces in your house there
is no reason to insulate between heated spaces.
Unless, of course, you want to have a different heating/cooling zone
for each or if it is for sound proofing.
But if your joist are really 12 inches apart (that is a bit unusual
they are normally 16 inches apart) I suppose buying an R30 unfaced
fiberglass insulation for ceiling joist that are set 24 inches apart
and cut it in half long ways.
You should have little waste that way.
If you feel you don't need that much insulation you can save a ton of
money going with R19 or R13.
The walls are pretty much insulated, I guess, they are cinder block about
one half of the basement is above ground.
I'm working on extra insulation for the windows. The problem is the
basement is unheated w/a gas water heater generating some heat. So cold
air - 48 degrees F today - is seeping into the living space on the first
floor. (the house has electric baseboard heat, including the basement but
I'm trying to conserve by insulating and looking at other heat sources)
Today the basement is 48 degrees F. Outside temp going to 14 degrees F this
Upstairs I'm covering the 20 y/o cheap replacement windows in plastic. I
installed a high quality "door sweeP on the inside of the door which is a
I might suggest cutting 2" sheet styrofoam to fit against the floor
between the rafters. It will not interfere with subsequent wiring and
will make the floor a lot warmer. The gaps in the styrofoam are
insulated with wood 2x10s.
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