Ho rohakana ha fiber fiberglass le lohiloeng haholo ke lintho tse lohiloeng likhoele tse ngata tsa khalase tse nang le matla a maholo, ho hanyetsa ha mocheso o phahameng. Hangata e sebelisoa ho tiisa thepa e kang lipolao, rabara le konkreite, hape e boetse e sebelisoa masimong a indasteri joalo ka likepe le sefofane.