Qingdao Wenrun Holding Co., Ltd. nyob rau hauv Qingdao Tuam Tshoj yog cov kws tshaj lij lub ru tsev thiab pas dej ua ke tsim thiab cov khoom siv.Peb tsom rau kev tsim khoom thiab kev lag luam ntawm PVC TPO thiab EPDM membrane rau lub ru tsev, EPDM liner rau lub pas dej.Nyob rau tib lub sijhawm peb muab ib qho kev pabcuam nres ntawm cov khoom siv cuam tshuam (seam daim kab xev, npog daim kab xev, kho daim kab xev, prefabricated ces kaum, ntws, scupper, fastener, daim hlau, txiav bar, U bar, vuam tshuab, txhim kho cov cuab yeej thiab lwm yam) thiab flashing rau ib leeg. ply ru tsev system, ntsuab ru tsev system, photovoltaic ru tsev system thiab pas dej los tiv thaiv seepage system.