Subject: UV Protection From Housing Materials and Colors

I have had melanoma and basal cell skin cancer.  I'm trying to understand how 
UV rays react on different housing materials and colors.
 
For example, RESIDENTIAL ROOFING & SIDING:
 
Does the type of material and wether it's a light or dark color, give me more 
UV ray protection?
 
Is there any material and/or color that absorbs the UV rays and doesn't let it 
go through to the next material underneath it.  If it keeps absorbing the UV 
rays, does the degree of protection diminish?  
 
Also, if it's a material that reflects UV rays, could it reflect back into the 
house windows from it bouncing off of other objects outside?
 
What about INTERIOR HOUSE PAINT?
 
Any help is appreciated.
 
Thank you very much.

Re: UV Protection From Housing Materials and Colors