Polyurethane ifuro ya sandwich urukuta (16mm) nigicuruzwa gishya gikunzwe cyane.Irashobora gukoreshwa mu nyubako nshya kandi zishaje.Nibidafite umuriro, kubika ubushyuhe nibikoresho byiza byo gushushanya inyubako.
Aka kanama kagizwe nuburyo butatu igice cyimbere cyanditseho ibara ryometseho galvalume yicyuma, ibikoresho byibanze ni polyurethane ifuro ifuro (kugirango ikorwe), igice cyinyuma ni file ya aluminium, ibice bitatu byakozwe ninganda zikora inganda.