Boral/TruExterior is made from fly ash isnt that concerning

I am debating between Boral/Tru exterior versus Hardie.  The Boral actually specs better for what i want to do but I am very concerned about Fly ash which its made… I am debating between Boral/Tru exterior versus Hardie.  The Boral actually specs better for what i want to do but I am very concerned about Fly ash which its made…Read MoreGreenBuildingAdvisor