Building　waterproofing　membranes　constitute　essential　components　of　construction　materials.　This　study　utilizes　the　life　cycle　assessment　(LCA)　methodology　to　develop　a　comprehensive　life　cycle　inventory　and　conduct　an　environmental　impact　assessment　of　typical　styrene-butadiene-styrene　(SBS)　modified　bitumen　waterproofing　membrane　products.　The　main　research　objective　of　this　paper　is　to　identify　the　key　factors　influencing　the　environmental　impact　of　products　and　to　provide　data　for　the　selection　of　green　materials　in　the　construction　industry.　The　results　reveal　that　the　production　of　raw　materials　for　SBS-modified　bitumen　waterproofing　membranes　contributes　the　most　to　all　environmental　impact　categories,　followed　by　the　transportation　and　energy　production　stages,　while　the　production　stage　of　the　membranes　exhibits　a　relatively　smaller　contribution.　Within　the　raw　material　production　stage,　the　bitumen　production　process　exhibits　the　highest　contribution　to　fossil　fuel　depletion　(FFP)　environmental　impact,　surpassing　50%.　The　production　process　of　polyester　tire　cloth　demonstrates　the　greatest　influence　on　human　toxicity　potential　(HTPc),　global　warming　potential　(GWP),　freshwater　eutrophication　(FEP),　marine　eutrophication　potential　(MEP),　and　mineral　resource　scarcity　potential　(SOP),　accounting　for　54.63%,　32.86%,　68.55%,　72.41%,　and　61.69%,　respectively.　Additionally,　the　production　process　of　base　oil　exhibits　the　most　significant　contribution　to　fine　particulate　matter　formation　(PMFP)　and　terrestrial　acidification　potential　(AP)　among　the　environmental　impact　indicators.　Variations　in　the　quantities　of　polyester　tire　cloth　and　base　oil　exhibit　the　most　notable　influence　on　the　environmental　indicators　of　the　product.　Specifically,　the　sensitivity　analysis　reveals　that　polyester　tire　cloth　has　the　greatest　impact　on　mineral　resource　scarcity　potential　(SOP);　base　oil　exhibits　the　highest　sensitivity　to　fossil　fuel　depletion　(FFP).　©　Published　under　licence　by　IOP　Publishing　Ltd.