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Old 09-24-14, 06:20 PM   #11
buffalobillpatrick
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I agree with stevehull & mackstann

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Old 11-30-14, 02:04 PM   #12
JRMichler
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I just ran across this thread. I built a house in 2002 in Ashland, WI. I estimated the heat loss without any allowance for heat loss through the crawlspace floor. The crawlspace walls have 4" of XPS foam.

The estimated heat loss was 13,000 BTUH for a 1320 square foot house based on 70 deg F inside and -20 deg F outside. The actual heat loss came in at 18,000 BTUH.

Then I got my hands on a newer copy of the ASHRAE Handbook of Fundamentals. That book, unlike previous editions, had a calculation for heat loss through basement floors. The calculated heat loss through my crawlspace floor was almost 5,000 BTUH.

I vote to insulate.
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Old 12-01-14, 10:40 AM   #13
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JRMichler, I agree 100%

Also in cold climate, if radiant in-floor heating is used, the "standard" 2" of blueboard XPS under slab is WAY UNDER INSULATED

On my next house, I will use 6" of EPS in field & 10" around perimiter.

I have a neighbor who just sold his house in my development. He did maninenance on heating systems on large expensive homes in Vail Colorado.

Even though he claimed to know everything about radiant systems, I'm sure he was just a "grunt" who cleaned out boilers etc. & didn't know squat about design.

When he built his house, he didn't put ANY insulation under radiant walkout basement slab!

When he 1st tried to heat the walkout basement the boiler ran for 3 days pouring heat into cold ground. When the room air thermostat was finally satisfied, the temperature kept climbing up to about 85*F After that he never heated that level of house.

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Old 12-01-14, 02:08 PM   #14
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Quote:
Originally Posted by buffalobillpatrick View Post
JRMichler, I agree 100%

Also in cold climate, if radiant in-floor heating is used, the "standard" 2" of blueboard XPS under slab is WAY UNDER INSULATED

Yeah, In my not very humble opinion, the radiant industry, including the "expert darlings" are not up to date.

The last edition of the book that is considered the 'radiant bible' gave barely a mention to the state of the art. That's when I began to understand that its information is paced to match the manufactured systems... and it is actually a sales tool.

I think that there is more state of the art info here on EcoRenotator. Trouble is that it is also mixed in with trade lore from the fossil fuel era.

It would be good to do a "Best Practices" thread, but the best practices would have to be stated early, before the dilution begins.

-AC

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