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 nokukhipha, ukwakhiwa kulula, kungasindisa izindleko nesikhathi sokwakha.