Urukuta rw'inyuma rusanzwe rukoresha 50mm - 100mm (5-10cm) z'uburebure bwa polystirene (XPS). Mu turere dukonje cyane two mu majyaruguru, uburebure bwa 8cm cyangwa burenga birasabwa kwihanganira ubushyuhe buke bukabije. Kubyuma byubatswe cyangwa inkuta zoroheje, ubugari bwa 5-7cm bugomba gutoranywa nyuma yo kubara imiterere kugirango wirinde guhinduka kubera ubushobozi budahagije bwo gutwara imizigo.
Kubisenge byamazu, ibisenge byo guturamo birasabwa kuba 50mm-80mm (5-8cm) kubyimbye kugirango uburinganire bwubukungu nubukungu. Ibisenge by'inganda bifite inganda zinyeganyega (nk'ibikoresho bifata ibyuma bikonjesha hamwe n'umuyoboro uhumeka) bisaba umubyimba wa 10cm kugirango ugabanye kwangirika kwangirika kurwego.
Kugirango habeho gukingira hasi no kurinda ubushuhe, kureremba hasi birasabwa kuba 30mm - 50mm (3-5cm) kubyimbye kugirango bitandukane neza nubutaka bwubutaka. Imiyoboro yo gushyushya munsi yubutaka igomba gushyirwaho hamwe na 20mm-30mm (2-3cm) yuburebure bwimbitse bwa XPS kugirango ikingire imiyoboro kandi irinde gutakaza ubushyuhe hasi.