Does Grasscrete lessen heat island effect? A Does Grasscrete lessen heat island effect? Yes. Concrete is much lighter in color than blacktop so even for void grassed only installations there is improved reflectance. var hupso_services_t=new Array("Twitter","Facebook","Google Plus","Pinterest","Linkedin","StumbleUpon","Digg","Reddit","Bebo","Delicious");var hupso_background_t="#EAF4FF";var hupso_border_t="#66CCFF";var hupso_toolbar_size_t="medium";var hupso_image_folder_url = "";var hupso_url_t="";var hupso_title_t="Does%20Grasscrete%20lessen%20heat%20island%20effect%3F";