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Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?

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EvaH (OP)

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Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?

« on: 07/12/2018 10:10:37 »

Dave wants to know:

Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?

Can you help?

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Re: Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?

« Reply #1 on: 07/12/2018 10:42:09 »

No.

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Re: Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?

« Reply #2 on: 07/12/2018 11:04:22 »

The roof itself would be regarded as "SPF50+".

However, light reflected off a lake, or coming in through open windows and doors would carry a small amount of UVA & UVB around the roof.

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Re: Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?

« Reply #3 on: 07/12/2018 14:01:16 »

Almost anything you can't see through has an SPF of over 50. Usually a lot more than 50.

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