Rwb thaiv tsev nrog extruded polystyrene ua npuas ncauj, tshuaj xyuas uas koj tuaj yeem nyeem hauv qab no, suav nrog kev siv cov khoom siv uas muaj cov thermal conductivity tsawg, nws yog compressive heev. Qhov zoo ntawm cov rwb thaiv tsev yog txiav txim siab los ntawm cov qauv ntawm uniformity ntawm lub hlwb kaw, lawv tsis tau ntim nrog dej, thiab cov qib qis ntawm noo noo nqus muab siab tiv taus kub hauv qab xoom