A roof made of thermoplastic white vinyl , for example , can reflect 80 % or more of the sun 's rays .
A roof made of thermoplastic white vinyl , for example , emit at least 70 % of the solar radiation that the building absorbs .
A roof made of thermoplastic white vinyl , for example , can reflect 80 % or more of the sun 's rays and emit at least 70 % of the solar radiation that the building absorbs .