Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: EvaH on 07/12/2018 10:10:37

Title: Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?
Post by: EvaH 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?

Title: Re: Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?
Post by: alancalverd on 07/12/2018 10:42:09

No.

Title: Re: Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?
Post by: evan_au 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.

Title: Re: Can UVA and UVB rays pass through a wood ply roof with a bitumen felt covering?
Post by: Bored chemist 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.