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charleseee, Any temp diff at joints is important, even as little as 5C.

IRstuff You are correct in that conclusion. Daytime is the way to go especially at this time of the year for your area.

IRstuff, The heat escapeing from the inside may find the same path, but you have to consider temp differance and daytime sunlight can heat a roof surface to over 140 degrees. This will block any interior heat leakage that can be thermally viewed.

Training from a manufacturer is sometimes available but Call Snell Infrared in Montpelier Vermont and they can help you. I have never attended any of there courses but met John Snell over 20 years ago at my first Level 1 training. He is knowledgeable and not driven by the almighty dollar.

Performing an infrared scan during the day is very possible, even in the bright sunlight depending on the type of equipment you have. If you have a multi color display and it allows you to change temp gradiants, then you scan the roof area and record the data. Bring the information inside and...

Roy, I have reviewed all the reply's and each one has at least one point that is correct. 1.Safety - Walk through the plant and view the underside of the deck and look for Rusted areas. Mark any areas on plan and stay clear of them while performing the scan. 2. Scans can be done during the day...

First off, I am a roof consultant with 20 years of experience. The foam you are using has about an 80% failure rate. I suggest you remove down to the deck and apply a 4 ply built up roof. Johns Manville and Tremco are the two best manufactures of these types of systems. A good built up roof has...

First get a good thermographer, have all lights turned off and use an elevated platform to perform the IR scan. It will work if you have athermographer who understands condition under which you get optimal readings and can read the instrament accurately.