Flat roof question again!

[Tim Halpin]

Hello folks, I,ll spare you the info about me that I provided in my first unsuccessful post. Can anyone give me some helpful advice regarding flat roof surveys? I know later inspections are best for solar load, and to have a second body and all, but Where I live (Washington, Olympic Penn) can be a bit windy in the evening. What are the detriments to an infrared scan caused by wind, and the max wind speed we can effectively scan at? Any other advice is appreciated. Thanks, Tim

[John Snell]

Originally Posted by thalpin

Hello folks, I,ll spare you the info about me that I provided in my first unsuccessful post. Can anyone give me some helpful advice regarding flat roof surveys? I know later inspections are best for solar load, and to have a second body and all, but Where I live (Washington, Olympic Penn) can be a bit windy in the evening. What are the detriments to an infrared scan caused by wind, and the max wind speed we can effectively scan at? Any other advice is appreciated. Thanks, Tim

Tim,

I did not see this post before replying to your similar post of 6/19. Having just been in Seattle last week ("Junuary" they called it), I know the challenge where you are is getting enough sunny days in a row to dry the roof surface! If the roof surface is not dry, even down in the gravel, the roof can not be "charged" by the sun. Let's assume you will have some good July/August/Sept weather, as you often do. The wind, over about 10mph will either prevent a signature from forming or will whisk away them away more quickly than you'd like. You can also see "wind shadows." Often, even where you are, there is a period right at dusk when the wind drops a bit; my suggestion is to get up on the roof before sunset and work as quickly as you can safely.

Again, if you need some basics on roofs, I'd point you toward our webinar on the same:

https://www.thesnellgroup.com/Traini....aspx?id=10078

Thermally yours,

John Snell
ASNT NDT Thermal/Infrared Level III #48166
Snell Infrared
800-636-9820
802-229-9820
http://www.thesnellgroup.com
http://www.IRTalk.com
http://www.thermalsolutions.org

[John Snell]

Originally Posted by thalpin

Hello folks, I,ll spare you the info about me that I provided in my first unsuccessful post. Can anyone give me some helpful advice regarding flat roof surveys? I know later inspections are best for solar load, and to have a second body and all, but Where I live (Washington, Olympic Penn) can be a bit windy in the evening. What are the detriments to an infrared scan caused by wind, and the max wind speed we can effectively scan at? Any other advice is appreciated. Thanks, Tim

Tim,

I did not see this post before replying to your similar post of 6/19. Having just been in Seattle last week ("Junuary" they called it), I know the challenge where you are is getting enough sunny days in a row to dry the roof surface! If the roof surface is not dry, even down in the gravel, the roof can not be "charged" by the sun. Let's assume you will have some good July/August/Sept weather, as you often do. The wind, over about 10mph will either prevent a signature from forming or will whisk away them away more quickly than you'd like. You can also see "wind shadows." Often, even where you are, there is a period right at dusk when the wind drops a bit; my suggestion is to get up on the roof before sunset and work as quickly as you can safely.

Again, if you need some basics on roofs, I'd point you toward our webinar on the same:

https://www.thesnellgroup.com/Traini....aspx?id=10078

Thermally yours,

John Snell
ASNT NDT Thermal/Infrared Level III #48166
Snell Infrared
800-636-9820
802-229-9820
http://www.thesnellgroup.com
http://www.IRTalk.com
http://www.thermalsolutions.org

[Nick Gromicko]

Thanks John.