| Title | By | Posted On |
| Bat dung between exterior and interior wall |
rmaverick |
1/20/2004 |
Situation: Bat have previously entered a building and have alleged to have left large amounts of bat dung between the exterior split face block wall and the interior cinder block wall. They entered thru the eaves areas due to alleged improper construction. The bat situation has been abated, but alleged large amounts of bat dung remain between the two walls.
Problem: Determing where the bat dung is between the walls by some sort of a testing method or with infra red photography. Since the bats have been alleged to be gone, infrared may not be applicable......any ideas.....appreciate your help.......thanks |
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| Re:Bat dung between exterior and interior wall |
ron lucier |
1/21/2004 |
More details needed:
1) Local atmospheric temperature?
2) Does the sun shine on this wall?
3) Is there insulation in the block cavities?
If the wall is not in a cold climate and inspection early morning while the sun heats it should show that the dung has a significantly different heat capacity than the air space in the wall. Also try looking at sundown. If you are in a cold climate and interior inspection of the wall may show differences in both heat capacity and thermal resistance. Not sure what the R-value of bat dung is, though. If you find a huge difference you may have discovered a new insulation material! Send your images to me at: ron.lucier@flir.com
Thanks for your post! |
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| Re:Bat dung between exterior and interior wall |
stewart |
2/5/2004 |
| We have done similar surveys not for dung, but for mortar. The mortar bridges the cavity and conducts heat out more quickly. I no dung expert but I guess it would have the same effect. We have also pulsed radar into voids to help map the exact located of voids. Simple radar scans at 250mm centre is fairly quick and easy, though IR is much simpler if you can heat the building. |
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| Re:Bat dung between exterior and interior wall |
jdemonte |
2/7/2004 |
I once used IR to find a bat that had gotten caught in our work shop, but never looked for guano before! That is an excellent Inframation paper if I've ever heard of one.
Like Ron and Stewart said, and remember that if you are to see a difference in the conductivity (hopefully there is one), you will need a temperature difference between the inside and outside of the wall for the infrared camera to do the job. Normally this is not too difficult, but that is why Ron is asking the right questions. |
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| Re:Bat dung between exterior and interior wall |
john taspeel |
3/25/2008 |
I don't think that you will find it with infrared.
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