I-Galvalume (GL) iikhoyili zensimbi / amashiti zisetyenziswa ikakhulu ekwakheni, kumzi-mveliso wokukhanya, kwimoto, njl. Kumzi-mveliso wokwakha, iikhoyili zentsimbi / amashiti ezisetyenziselwa ukwenziwa kwezinto ezisetyenziselwa ukwenziwa kwezinto zokwenza izinto zisetyenziswa ikakhulu ekwenzeni imveliso yophahla, eluphahleni lwendlu, njlnjl. Amashiti ayintsimbi elungileyo yesiseko sePPGL yentsimbi / amashiti.