--- title: St. Louis Arch | Laurenco Landmark Waterproofing description: Laurenco RMA waterproofing replaced a failing system beneath the St. Louis Arch, resolving 20+ leaks and protecting this iconic national landmark. image: https://www.laurencowaterproofing.com/hubfs/Jefferson-National-hero%201.jpg --- [![light-header-logo](https://www.laurencowaterproofing.com/hubfs/laurenco-waterproofing/images/light-header-logo.svg)](https://www.laurencowaterproofing.com/?hsLang=en) - Systems - [RMA System](https://www.laurencowaterproofing.com/products-systems/rma-systems) - [PMMA System](https://www.laurencowaterproofing.com/products-systems/pmma-systems) - [Laurenco Deck System](https://www.laurencowaterproofing.com/products-systems/traffic-deck-coating-systems) - Products - [Laurenco Adhesive](https://www.laurencowaterproofing.com/products-systems/laurenco-adhesive) - [Laurenco Roll](https://www.laurencowaterproofing.com/products-systems/laurenco-roll) - [Blue PMMA Universal Primer](https://www.laurencowaterproofing.com/products-systems/blue-pmma-universal-primer-laurenco-waterproofing) - [Butyl Sealant Tape](https://www.laurencowaterproofing.com/products-systems/butyl-sealant-tape) - [Laurenco STRIPE](https://www.laurencowaterproofing.com/products-systems/laurenco-stripe) - [Laurenco CLEAR](https://www.laurencowaterproofing.com/products-systems/laurenco-clear) - [Laurenco BUILD](https://www.laurencowaterproofing.com/products-systems/laurenco-build) - [Laurenco WP](https://www.laurencowaterproofing.com/products-systems/laurenco-wp) - [Laurenco Protection Sheets](https://www.laurencowaterproofing.com/products-systems/laurenco-protection-sheets) - [W60LA](https://www.laurencowaterproofing.com/products-systems/w60la) - [Neoluminum](https://www.laurencowaterproofing.com/products-systems/neoluminum) - [Laurenco Fleece](https://www.laurencowaterproofing.com/products-systems/laurenco-fleece) - [Laurenco CVR](https://www.laurencowaterproofing.com/products-systems/laurenco-cvr) - [REPELZ MVS](https://www.laurencowaterproofing.com/products-systems/repelz-mvs) - [PMMA Catalyst](https://www.laurencowaterproofing.com/products-systems/pmma-catalyst) - 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Informational Links - [Designer Applicator Cheat Sheet](https://www.laurencowaterproofing.com/resources/designer-applicator-cheat-sheet) - [Contact Us](https://www.laurencowaterproofing.com/contact) [Talk to An Expert](https://www.laurencowaterproofing.com/talk-to-expert?hsLang=en) projects ![Jefferson-National-hero 1](https://www.laurencowaterproofing.com/hs-fs/hubfs/Jefferson-National-hero%201.jpg?width=798&height=774&name=Jefferson-National-hero%201.jpg) ![jefferson-1](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-1.jpg?width=864&height=487&name=jefferson-1.jpg) ![jefferson-3](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-3.jpg?width=864&height=487&name=jefferson-3.jpg) ![jefferson-2](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-2.jpg?width=864&height=487&name=jefferson-2.jpg) ![jefferson-4](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-4.jpg?width=864&height=487&name=jefferson-4.jpg) / # Jefferson National Expansion Memorial Laurenco Waterproofing protects some of America’s most recognized landmarks, preserving their historic significance for years to come. ![Jefferson-National-hero 1](https://www.laurencowaterproofing.com/hs-fs/hubfs/Jefferson-National-hero%201.jpg?width=798&height=774&name=Jefferson-National-hero%201.jpg) ## PROJECT DETAILS ### Location St. Louis, MO ### Completion Date 2024 ### Industry Museum ### Project Type Tunnel, Below-Grade, Pavers, Wall and Lid Waterproofing ### Systems Used [RMA System](https://www.laurencowaterproofing.com/products-systems/rma-systems?hsLang=en) ### Applicator Western Specialty Contractors, Inc. ![jefferson-1](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-1.jpg?width=864&height=487&name=jefferson-1.jpg) ![jefferson-3](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-3.jpg?width=864&height=487&name=jefferson-3.jpg) ![jefferson-2](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-2.jpg?width=864&height=487&name=jefferson-2.jpg) ![jefferson-4](https://www.laurencowaterproofing.com/hs-fs/hubfs/jefferson-4.jpg?width=864&height=487&name=jefferson-4.jpg) / ## PRODUCTS USED ![adhesive (1)](https://www.laurencowaterproofing.com/hs-fs/hubfs/adhesive%20(1).png?width=400&height=400&name=adhesive%20(1).png) [Laurenco Adhesive](https://www.laurencowaterproofing.com/products-systems/laurenco-adhesive?hsLang=en) ![sheet](https://www.laurencowaterproofing.com/hs-fs/hubfs/sheet.png?width=400&height=400&name=sheet.png) [Laurenco Roll](https://www.laurencowaterproofing.com/products-systems/laurenco-roll?hsLang=en) ![spc-sheet](https://www.laurencowaterproofing.com/hs-fs/hubfs/spc-sheet.png?width=400&height=400&name=spc-sheet.png) [Laurenco PPC](https://www.laurencowaterproofing.com/products-systems/laurenco-protection-sheets?hsLang=en) ![butyl](https://www.laurencowaterproofing.com/hs-fs/hubfs/butyl.png?width=400&height=400&name=butyl.png) [Laurenco Butyl Seal Tape](https://www.laurencowaterproofing.com/products-systems/butyl-sealant-tape?hsLang=en) ## The CHALLENGE The St. Louis Arch is situated on the banks of the Mississippi River and built over the park museum that suffered from over twenty interior leaks originating from expansion joints, penetrations, and field transitions. ## The SOLUTION The existing composite PVC and coal tar pitch waterproofing and its overburden was removed to the structural deck and replaced with the FBC-Laurenco rubber modified asphalt waterproofing. The compatibility of the material with coal tar pitch residuals expedited the installation by not requiring the complete scarification of the deck. Subsequently, the new visitor center facility was built adjacent to the museum and FBC-Laurenco waterproofing was again used to waterproof the new construction. [Talk to An Expert](https://www.laurencowaterproofing.com/talk-to-expert?hsLang=en) ## OTHER PROJECTS ![world-trade-hero (1)](https://www.laurencowaterproofing.com/hs-fs/hubfs/world-trade-hero%20(1).webp?width=798&height=774&name=world-trade-hero%20(1).webp) Green Roof, Plaza, Street/Walkway Waterproofing Commercial Building ### WORLD TRADE CENTER [Explore](https://www.laurencowaterproofing.com/our-work/world-trade-center?hsLang=en) ![longwood-hero](https://www.laurencowaterproofing.com/hs-fs/hubfs/longwood-hero.jpg?width=798&height=774&name=longwood-hero.jpg) Foundation Waterproofing, Tunnel Waterproofing, Slab Waterproofing Museum, Park ### Longwood Gardens [Explore](https://www.laurencowaterproofing.com/our-work/longwood-gardens?hsLang=en) GET IN TOUCH Have questions about systems, applications, or your project? 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