Lapho uthenga isitshalo sokuxuba i-asphalt, ochwepheshe bomkhiqizi benze izikhumbuzo ezibalulekile mayelana nezidingo zokuthambisa zemishini, okuhlanganisa ukugcotshwa kwengxenye ngayinye. Mayelana nalokhu, abasebenzisi baphinde bakhe izindinganiso eziqinile zokuyilawula, ngale ndlela elandelayo:

Okokuqala, amafutha okugcoba afanelekile kufanele afakwe njalo engxenyeni ngayinye yesitshalo sokuxuba i-asphalt; ngokwenani lamafutha okugcoba, kufanele agcinwe egcwele, futhi ungqimba lwamafutha echibini lamafutha kufanele lufinyelele izinga lamanzi elichazwe esilinganisweni, hhayi kakhulu noma lincane kakhulu, ngaphandle kwalokho lizothinta ukusebenza kwezingxenye; ngokwezinga likawoyela, kumele ahlanzeke futhi akumele ahlanganiswe nokungcola okunjengokungcola, uthuli, ama-chips namanzi, ukuze kugwenywe ukulimala kwezingxenye zesitshalo sokuxuba ngenxa yokungagcobi kahle.
Okwesibili, uwoyela wokugcoba ethangini likawoyela kufanele ushintshwe njalo, futhi ithange likawoyela kufanele lihlanzwe ngaphambi kokushintshwa ukuze kugwenywe ukungcoliswa kwamafutha amasha. Ukuze ugweme ukuthintwa yizici zangaphandle, iziqukathi ezifana namathangi kawoyela kufanele zivalwe kahle ukuze ukungcola kungangeni.