cold, unfinished basement

Old 01-25-12, 01:21 AM
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cold, unfinished basement

in an attempt to reduce energy heating bills i insulated all exposed heat ducts in the unfinished basement which resulted in an overall drop in basement temperature to 61 F. as a result the first level temperature at ground level is 65 degrees when the thermostat is set for 68. is it unwise to tap into one or two places along the main heating duct work in the basement, adding vents to raise the temperature? currently there are no heat registers in the basement.
Old 01-25-12, 04:21 AM
Join Date: Oct 2008
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Basements are like an open door. Your insulation did as expected, it reduced the heat flow into the basement. What you need is to reduce the heat loss due to the basement. Where a house reast on top of the foundation "always" leaks a lot of air. Air sealing that connection and the cavity at the end of each floor joist will make an improvement. Then air seal all holes headed uo into the house, as many of them continue right uo to the attic and out.

8" of concrete has about the same heat loss as a single pane of glass, so next would be some insulation on the inside of all of the exposed concrete plus an extra foot. The foil faced polyisocyanurate provides a reflective barrier, insulation, and should meet your local fire codes, but check to be sure the brand you want to use is approved. Dow Thermax Sheathing meets FM 4880 and should be good.

Here is a link to efficiency Vermont on where to look for air leaks and another for basement insulation.

Old 01-25-12, 04:44 PM
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Join Date: Dec 2005
Location: VA
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Heat the basement and you will heat the floor. Its code here to have heat in the basement. It just makes since to heat it.

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