Another basement insulation question


Old 11-15-05, 07:50 AM
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Join Date: Nov 2002
Location: Maryland
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Another basement insulation question

Currently basement is completely unfinished. Walls are mostly below grade (except for the top foot or so) and uninsulated. The builder insulated between the floor joists of the first floor. After insulating the walls in the basement, is there any reason to leave the insulation between the floor joists? Was wondering if I could remove it and use it in the walls. Only drawback I could see is possibly it would help some with sound deadening through the ceiling/floor. Do most people just leave it there?

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Old 11-15-05, 09:35 AM
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I personally would leave it (and would have added it if it wasn't already there), just for the sound control. You didn't mention your current climate control situation or future plans, which could further impact the decision.
Old 11-15-05, 10:33 AM
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Location: Ottawa, Canada
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It will have a dramatic effect on reducing the sound transmission. I installed insulation in my basement before drywalling and it really helps.
Old 11-15-05, 10:39 AM
Join Date: Nov 2004
Location: Northern Virginia
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From what I've read on another forum dedicated to building home theaters, you DEFINATELY want to insulate between the floor joists.

Old 11-15-05, 12:02 PM
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Location: Mountain Williams Missouri
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A drop ceiling works real good for what you want. You can just lay that insulation on top of the drop ceiling. you can get back into it to work or change any wires around or work on the water pipes if you have to. Dont forget the insulation up on the sill platein the joist

Old 11-21-05, 10:39 AM
Konrad Fischer
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Solid insulation will be best

what belongs sound and thermal insulation. So I would recommend only solid materials as insulation like wood, gypsum cardboard, brick etc. depending of the situation referring dampness.

Normal thermal insulation will 1st humidify in walls and 2nd not work against IR-Radiation transports, which will cause about 99% of thermal losses through constructions. I tested it out, you can see it here:

Good luck!


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Old 11-21-05, 06:35 PM
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Location: Asheboro, NC
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I cantin understandin the German
Old 11-22-05, 04:15 AM
Konrad Fischer
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Thumbs up Oh, I am so sorry,

but perhaps you can try again the just updated site. It is in 'my' english, some wrong terms and grammer are perhaps tolerable.

Konrad Fischer
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Old 11-22-05, 08:48 AM
Join Date: Mar 2005
Location: USA
Posts: 6,126
Another basement insulation question

Konrad - I understand you comments and concept.

Unfortunately, American construction, design and advertising is based on temporary, lightweight construction with lightweight materials that do well in the steady state hot box insulation tests, but do not perform as well in the real world with dynamic (not steady state) temperature and humidity fluctuations.

Most of the rest of the developed world understands the concept, but Americans have a limited view because of the tradition of light construction. One part of the concept that is recognized is the need for thermal interia and heat storage in solar homes. The use of the concept is recognized by some designers and standards, but not by the general public. It will be a long time before the concepts become fully understood, since an R-value is easy to understand (and mis-use).

Old 11-23-05, 03:03 AM
Konrad Fischer
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Thank you Dick

but I know the american standards of lightweight building construction. We learn in university, we can see them in TV flying away through hurricanes and be transported on road and my cousin married an american carpenter from Boston. Besides in Germany the 'ecologic voodoo religion' promotes this lightweightery with all tricks as the last supper before temperature crash of the manmade heated world ;-)

So I suggest to insulate only with solid wood - that may be due to the lightweighters, or? Look to my to get some idea of our 'Lichtenfelser Experiment', where we checked out the senseless R-value-champoins like fiberglass, polystyrene etc.

Nevertheless, I know enough from completely molded cellulose and fiberglass and polystyrene insulation, also in spite of cellulose insulation is poisoned material (biozides). Never would I bring such pest in my house.

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Last edited by Sharp Advice; 11-30-05 at 07:56 PM.

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