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Subject Author Date
Insulating below a floor Steve Barker LT 11-10-2006
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Posted by on November 11, 2006, 5:49 pm



>Warm air rises, cold air sinks...

But air conducts and heat radiates downwards. A vapor barrier on
the ground to avoid moisture and a layer of foil over the joists
with air gaps above and below can save energy.

Nick


Posted by Malcolm Hoar on November 11, 2006, 6:32 pm


wrote:
>
>>Warm air rises, cold air sinks...
>
>But air conducts

..less than almost anything other than a vacuum. Check
the thermal conductivity of air in a suitable reference
work.

>and heat radiates downwards.

And a floor, which is generally not very warm to start
with, isn't going to radiate very much (in any direction).

--
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
| Malcolm Hoar "The more I practice, the luckier I get". |
| malch@malch.com Gary Player. |
| http://www.malch.com/ Shpx gur PQN. |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Posted by David Combs on December 3, 2006, 6:20 pm


wrote:
>>
>>>Warm air rises, cold air sinks...
>>
>>But air conducts
>
>..less than almost anything other than a vacuum. Check
>the thermal conductivity of air in a suitable reference
>work.
>
>>and heat radiates downwards.
>
>And a floor, which is generally not very warm to start
>with, isn't going to radiate very much (in any direction).

Indeed!

I recall from eons ago class that the radiation amount
varies as the (absolute!) temperature TO THE FOURTH POWER.

David



Posted by buffalobill on November 11, 2006, 2:41 pm


put your zipcode in the manufacturer's blank at:
http://www.owenscorning.com/around/roofing/zip.asp?ckie=complete

and read up at:
http://www.buildingscience.com/resources/homeowner.htm


Steve Barker LT wrote:
> I've mentioned in other posts about our 135 yr old house we're working on.
> At this point I'm rebuilding the floor on the lower level. This house
> basically sits on the ground. My new joists will be about 4" off the dirt.
> I've been through the "to vent or not to vent" threads about crawl spaces.
> I've decided not to ventilate. It's been closed for 135 years, it can keep
> being closed. My question is, IS there any reason why I shouldn't fill this
> space will insulation? Whether it be fiberglass or blown cellulose? In a
> few days I'll have all new joists and proper center support and will
> probably insulate unless there's some reason I shouldn't.
>
> thanks!
>
> --
> Steve Barker


Posted by Steve Barker on November 11, 2006, 8:28 pm


thanks for the links. I need all the mold info i can get.

steve


> put your zipcode in the manufacturer's blank at:
> http://www.owenscorning.com/around/roofing/zip.asp?ckie=complete
>
> and read up at:
> http://www.buildingscience.com/resources/homeowner.htm
>
>
> Steve Barker LT wrote:
>> I've mentioned in other posts about our 135 yr old house we're working
>> on.
>> At this point I'm rebuilding the floor on the lower level. This house
>> basically sits on the ground. My new joists will be about 4" off the
>> dirt.
>> I've been through the "to vent or not to vent" threads about crawl
>> spaces.
>> I've decided not to ventilate. It's been closed for 135 years, it can
>> keep
>> being closed. My question is, IS there any reason why I shouldn't fill
>> this
>> space will insulation? Whether it be fiberglass or blown cellulose? In
>> a
>> few days I'll have all new joists and proper center support and will
>> probably insulate unless there's some reason I shouldn't.
>>
>> thanks!
>>
>> --
>> Steve Barker
>



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