isisindo esilula, ukuphatha kalula, ukwakhiwa okulula: I-PVC kagesi, impahla yepayipi yokuxhumana ilula kakhulu, cishe i-1/5 yepayipi yensimbi, ehlanganiswe nepayipi le-PVC elihlanganiswe neziphakamiso zokwakha ngokushesha, ngakho-ke ukuphatha, ukulayisha nokuthulula, ukwakhiwa kulula, ingagcina izindleko nesikhathi sokwakha.