I live in low tech small town so I had to buy my own thermal camera to do my own survey of my house. I have rooms that the temperature changes rapidly so I suspect missing wall insulation. I’ve put off for years pulling the siding off my house to inspect, then came across thermal imagers. I have searched on the web for over a week for information on “rules” to use this device. (how I came across this forum). I found the certification training classes, but I just can’t afford the high price just to do my own house. I also found the Fluke videos, which I found relativity useless. I found one bit of information that I found very useful and that is the need for a 20 degree inside/outside difference to do a scan.
Which leads me to my first question; How long do the temperatures need to be at the 20 degree difference before I can get some good readings? I assume after sunset is the best time to scan?
I also want to check to see if my pitch roof is starting to leak, but I can’t view the entire roof from inside the attic. What is the ideal conditions to thermal scan from the outside? Like after a long rain and just after sunset of a sunny day? Will I get a good reading from the outside on a composition roof?
Also, how do I tell the difference between wet or missing insulation?
Any additional “rules” you care to share would be appreciated.
I already did the “normal” energy conservation stuff like added attic insulation, weather striping and used two dozen cans of foam and calking.