Adeka Ultraseal P-201 Waterstop

Adeka Ultraseal P-201 is a water-swelling, single component, elastic sealant. P-201 is used as a waterstop in new construction and in repair applications. It can be placed on damp or uneven surfaces and functions in a wide range of temperatures and ground water conditions water. P-201 will expand up to 2 times (100%) by volume in the presence of water.

Excellent product to seal joints between precast segments.
Use to seal PVC and AZ sheet pile interlocks.
Use to fill in rough areas when using Adeka strip products.

Availability: In Stock (320)

SKU: 14891

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Adeka Ultraseal P-201 is a single-component, hydrophilic waterstop sealant designed to provide durable, watertight sealing in critical concrete applications. When exposed to moisture, P-201 swells up to 100% of its original volume, creating internal pressure that actively seals joints, gaps, and penetrations. This controlled expansion allows the material to conform tightly to surrounding surfaces and block water ingress, even in the presence of hydrostatic pressure.

Formulated as a flexible, grey paste, P-201 is available in convenient 320 ml cartridges for precise application or bulk 3.17-gallon pails for larger-scale work. It adheres effectively to damp, rough, or uneven substrates without requiring a primer, making it especially well-suited for field conditions where ideal surface preparation isn’t always possible. Whether used in new construction or repair applications, P-201 offers a reliable alternative to traditional waterstops, with the added advantage of easy installation and compatibility with a wide range of materials including concrete, metal, and PVC.

From pipe penetrations and cold joints to precast segment seals and sheet pile interlocks, Adeka P-201 delivers versatile and long-lasting performance in both vertical and horizontal configurations. It is particularly effective in environments with variable temperatures and groundwater conditions, helping contractors achieve consistent, code-compliant waterproofing without delays or rework.

Key Features

Hydrophilic Expansion

Expands up to 100% by volume when exposed to water, filling voids and creating strong internal pressure to resist water infiltration.

Elastic Seal

Maintains flexibility and performance even under minor substrate movement or settlement.

Easy Application

Comes in a convenient 320 ml (10.8 oz) cartridge or 3.17-gallon pail for bulk applications — no special equipment needed.

Versatile Use

Suitable for new construction, retrofit, and repair work including cast-in-place and precast systems.

Broad Compatibility

Bonds well to concrete, metal, PVC, and other common construction materials.

Reliable Under Pressure

Effectively seals under hydrostatic pressure when bead size and placement are properly selected.

Recommended Applications

Adeka Ultraseal P-201 is a reliable choice for sealing joints and penetrations in below-grade concrete and water-retaining structures where long-term watertightness is essential. Its ability to bond to irregular or damp surfaces and swell upon contact with water makes it especially effective in applications where traditional waterstops are difficult to install or insufficient.

Common uses include sealing cold joints, control joints, and construction joints in cast-in-place concrete. It is frequently applied around piping and conduit penetrations through concrete walls and slabs to prevent groundwater intrusion. P-201 is also well-suited for sealing joints between precast concrete components such as box culverts, riser rings, and utility vaults. In civil and marine construction, it is used to seal sheet pile interlocks and expanded metal forms. Additionally, P-201 can be applied to repair cracks or fill rough voids in retrofit situations, including sealing around H-piles and other open joints exposed to water infiltration risks.

Frequently Asked Questions

How much does P-201 expand?

Adeka P-201 expands approximately 100% (2x its volume) when exposed to water, allowing it to effectively seal off voids and prevent leakage.

Can I apply P-201 on a damp surface?

Yes. P-201 can be applied to damp or uneven surfaces, making it ideal for in-progress construction or humid environments.

Does P-201 replace traditional PVC waterstops?

In many cases, yes. For non-moving joints, P-201 can serve as a standalone waterstop when used with proper concrete coverage and curing.

What is the curing time before placing the second concrete pour?

Cure time depends on the bead size, ambient temperature, and humidity. It must be fully cured to ensure performance — avoid displacing or deforming the bead during placement.

What’s the hydrostatic pressure resistance of P-201?

Hydrostatic resistance depends on the bead size and embedment. A properly placed ½” bead inside reinforced concrete can resist higher head pressure than a ¼” bead.

Is P-201 compatible with precast construction?

Yes. P-201 is widely used to seal joints in precast segments including manholes, box culverts, utility vaults, and riser rings. Ensure placement of adjoining segments before P-201 cures.

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