Udonga lwekhethini lengilazi olunohlaka lwensimbi oluzungeze iphaneli yengilazi lubizwa ngokuthi udonga lwekhethini lohlaka. Luhlukaniswe phakathi: udonga lwekhethini lohlaka oluveziwe, udonga lwekhethini lohlaka olufihliwe, kanye nodonga lwekhethini lohlaka olufihliwe ngokwesimo sodonga lwekhethini.
Udonga lwekhethini lengilazi yohlaka luguquguquka, lulula, kulula ukulifaka, kulula ukululungisa nokuluqaqa, futhi kulula ukulushintsha nokuyinakekela.
Uhlaka oluqondile (noma umshayo ovundlile) wodonga lwekhethini lohlaka lufakwa kuqala esakhiweni esiyinhloko, bese kufakwa umshayo ovundlile (noma uhlaka oluvundlile). Uhlaka oluqondile kanye nomshayo ovundlile kwakha uhlaka. Izinto zephaneli zicutshungulwa zibe izingxenye zeyunithi efektri bese ziqiniswa ohlakeni oluhlanganiswe uhlaka oluqondile kanye nomshayo ovundlile. Umthwalo othwalwa yingxenye yeyunithi yezinto zephaneli kumele udluliselwe esakhiweni esiyinhloko ngohlaka oluqondile (noma umshayo ovundlile). Uhlobo oluvame kakhulu lwalesi sakhiwo yilolu: ngemva kokuba uhlaka oluqondile kanye nomshayo ovundlile kufakwe endaweni ukuze kwakheke uhlaka, ingxenye yeyunithi yezinto zephaneli iqiniswa ohlakeni. Ingxenye yeyunithi yezinto zephaneli ixhunywe ngokuqondile kukholomu futhi ixhunywe ngokuqondile nomshayo ovundlile, futhi ijoyinti liphathwa nge-sealant ukuvimbela ukungena kwamanzi emvula kanye nokungena komoya.
1. Uhlaka oluveziwe: uhlobo lomsele ohlanganisiwe, uhlobo lomsele ohlanganisiwe, uhlobo lomsele ohlanganisiwe;
2. Uhlaka olufihliwe: uhlobo lwebhulokhi, uhlobo lokulenga oluphelele, uhlobo lokulenga kancane;
3. Uhlaka olufihlwe kancane: oluvezwe mpo noluvundlile, olufihliwe mpo noluvundlile.
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