Hollow hlau qhov rooj thiab cov thav ntawv tau teev nyob rau hauv ntau cov lag luam thiab cov tsev muaj kev lag luam (tej zaum vim tias cov hlau tuav tau zoo dua li ntoo).
Nyob rau hauv xyoo tas los, Kuv tau siv hollow hlau thav ntawv nrog ua ntej-tiav ntoo lub qhov rooj hauv ntau lub tsev. Hollow hlau thav ntawv muab ib txoj kev ruaj khov los ua kom tiav Gypsum Board qhib thiab lub qhov rooj ua ntej tiav yog txaus nyiam thiab yig. Mohawk qhov rooj zoo li muaj ntau. Ntoo ntas ntoo, siv ntoo lwg ntoo ncig ib ncig ntawm ib tug ntoo jamb thiab header, tseem nrov. Ntoo ntas ntoo nyiam ua qhov chaw ua, tshwj tsis yog cov khoom siv ua ntej dai cov ntoo. Aluminium thiab iav cov khw muag khoom tseem tau siv ntau rau hauv cov tsev lag luam.
