u- value

Boilerpro_5

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Mark_7

u- value

Anybody know the u-value of a 16" stone wall. Doing a heat loss on an old farm house. And there is nothing listed for that type of buliding.

Boilerpro_5

From ASHRAE Fundamentals

Limestone or sandstone is about 0.08 k value or at 16 inches, R= 1.28. Just remember that high mass structures like this respond very slowly, so when you hit design lows outdoors, it will take about 96 hours for that low temp to finally hit the inside surface. Also, they carry heat up fromthe ground, so the wall stays warmer than a frame wall. All this means is that you can keep equipment much smaller and still heat the home, assuming no setbacks.

Boilerpro

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Brad White_185

Bingo.

Boilerpro nailed it, not just on the technicals but on style and artistic interpretation.

9.9's across the board with China abstaining.



EDIT: The 1.28 is correct for the stone portion at 0.08 R per inch.

However, the indoor air film and outdoor air film (0.68 and 0.17 assuming a 15 MPH wind) will add another 0.85 R value just for showing up. Thus as a practical matter, the assembly R-value would be 2.13.

The corresponding u-factor would be 0.47. I have glass in my house better than that, but the mass helps.

Rick Kelly_4

To directly answer your question, the U-value would be 0.781