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Keycup® Waterstop: Revolutionizing Concrete Joint Formation
September 15, 2025
Keycup® is a groundbreaking, multi-functional concrete accessory engineered to simplify and enhance construction joint formation. Keycup® was recently named “Most Innovative Concrete Accessory” at the 2024 World of Concrete in Las Vegas, NV, underscoring its industry-changing impact.
Key Features of Keycup®
- Dual-Function Design: Keycup® simultaneously secures waterstop and forms a clean, keyed joint—ideal for slab-on-grade, wall joints, lumber replacement, and labor-saving applications.
- Universal Fit: Compatible with most flat-strip and center-bulb waterstops, accommodating widths from 6” to 9”.
- Field-Friendly for Directional Changes: May be miter-cut at 45° to form seamless 90° corners or multi-way junctions—without requiring custom fittings.
- Cost and Time Efficient: Compared to traditional wood forming, Keycup® saves approximately $5.50 per foot on initial installation and up to $50 per 10-ft section on reuse.
Keycup® Applications
- Slab on grade
- Wall joints
- Lumber replacement
- Labor saver
Four Easy Steps
to Place Waterstop and Form a Keyed Joint
Easy Installation
- Place the waterstop into the Keycup® former, backed by wood forming.
- Pour the first concrete lift.
- Strip the formwork and remove the former.
- Pour the subsequent concrete section.
Universal Waterstop Fit
Fits Most Waterstops 6 to 9 Inches in Width
Easy Change of Directions at the Concrete Joint
Miter Cut at 45° for Joint Continuity
Simple to Form
Back with Wood and Stakes
Unique Concrete Accessory
Integrated Form for Embedding a Waterstop in a Keyed Concrete Joint
J P Specialties has been manufacturing the Earth Shield® line of waterstops for over 20 years. We are dedicated to providing technical support for a complete range of waterstops and focused on being the best. Our products (PVC, TPV, SS, and strip-applied) have the best physical properties in the industry, and more importantly, we provide unmatched service and technical support.
At the engineering level, our technical leaders are officers in multiple ACI committees. We were the first waterstop company to get NSF 61 approval, and our owner has written the leading professional resource book used in the construction industry (Little Book of Waterstop by David Poole). Our popular accredited seminar (worth one hour CE credit) is presented nationally and internationally to over 200 engineering and owner offices with many thousands of attendees.
We also provide contractors with aggressive pricing, extensive inventories, and factory fabrications for both standard and custom fittings. J P Specialties also does on-site welding schools and certifies attendees for the proper welding of waterstops.
Waterstop Keycup® in Action
In Stock and Ready to Ship
Factory-Certified Distributor Partners
Contact the Waterstop Experts
Phone: 800-821-3859
California: 951-763-7077
Learn more at
@waterstopking #waterstopking #waterstop #dewalt #concrete
Company: 
JP Specialties, Inc.
Product: Waterstop Profiles
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