Khetho pakeng tsa mapolanka a extruded polystyrene (XPS) le mapolanka a foam a itšetlehile ka litlhoko tse khethehileng:
1. Ho etelletsa pele mohatsela oa mocheso: Khetha liboto tsa XPS, tse loketseng mesebetsi ea nako e telele{{1}e kang mabota a ka ntle le ho futhumatsa fatše.
2. Tekanyetso e lekanyelitsoeng: Khetha mapolanka a foam, a loketseng ho kenya lerako la ka hare kapa lisebelisoa tsa ho paka.
3. Libaka tse mongobo: Mapolanka a XPS a fana ka ho hanyetsa metsi a phahameng, ho thibela mapolanka a foam ho monya metsi le ho hlōleha.
4. Tšebeliso ea nakoana: Mapolanka a foam a theko e tlaase 'me a fana ka boleng bo molemo.