Use Mountain Grout Flexible for: Rapid sealing of active leaks in concrete cracks and joints; stopping infiltration in manholes and underground vaults; restoring watertightness in tunnels, dams, stormwater systems, elevator pits, parking structures, and waste treatment assets.

Mountain Grout Flexible: A Technical Overview

Mountain Grout Flexible is a low-viscosity, hydrophobic polyurethane injection system that reacts with water to form a durable, closed-cell grout. Pumped as a single component with optional Accelerator “B”, it gives professional applicators precise control over gel and rise times to suit leak severity and temperature. The cured grout retains volume through wet/dry cycles, adheres tenaciously to concrete, and delivers a reliable, inert, non-toxic seal — ideal for remedial waterproofing in civil and building infrastructure.
30×
Expansion on reaction for effective void filling

Core Features & Specifications

  • Hydrophobic polyurethane forms closed-cell grout that resists shrinkage through wet/dry cycles.
  • Pumps as a single component; add Accelerator “B” to tailor reaction profile to site conditions.
  • Low viscosity liquid (~500 mPa·s) promotes penetration into fine cracks and hairlines.
  • Up to 30× volumetric expansion to chase water paths and fill voids efficiently.
  • No VOCs, 100% solids; non-flammable with high flash point for safer handling.
  • Cured properties: density ~64 kg/m³; elongation ~44% for dynamic service conditions.
  • Reaction control: at 1.25% B, expansion starts ~50 s, completes ~4 min; at 2.5% B, starts ~15 s, completes ~65 s (at 25 °C).
  • Designed for critical remedial tasks: manholes, stormwater, dams, tunnels, elevator pits, parking structures, and treatment plants.

The Mountain Grout Flexible Advantage

  • Engineer confidence: stable, closed-cell structure delivers a permanent, inert seal under cyclic wetting.
  • On-site control: dial in gel/rise times with Accelerator “B” to match leak severity and temperature.
  • Productivity: single-component pumping reduces setup complexity and speeds mobilisation.
  • Coverage certainty: 30× expansion tracks water pathways to seal beyond the visible crack.
  • Safer handling profile: non-flammable, no VOCs, high flash point.

Proactive Troubleshooting

Scenario: Minimal water at the crack face

Potential Outcome: Incomplete reaction and insufficient rise in dry sections.

Adheseal Best Practice: Pre-wet the crack path (not flood) to ensure consistent contact water; select Accelerator “B” dosage to achieve reliable gel at site temperature.

Scenario: High-flow active leak washing out resin

Potential Outcome: Resin displacement before foaming, leaving leak pathways open.

Adheseal Best Practice: Increase Accelerator “B” to shorten start time, stage-inject from downstream ports, and reduce injection pressure to favour in-situ foaming and capture.

Scenario: Sparse port layout on thick concrete

Potential Outcome: Unfilled voids and intermittent sealing.

Adheseal Best Practice: Tighten port spacing based on element thickness and water path behaviour; inject until adjacent ports show material or flow reduction is observed.

Applications in Practice: Trade Scenarios

For Remedial Waterproofers (On-site Applicator): Stopping active leaks in basement cracks

The Professional's Challenge

Active water is displacing materials during injection. You need reliable gel and rise before washout while maintaining penetration into hairlines.

The Adheseal Solution: Engineered Certainty in Practice

Pump Mountain Grout Flexible as a single component and tune Accelerator “B” to 2.5% for rapid start (≈15 s) and completion (~65 s at 25 °C). Stage injections from downstream to upstream, keeping pressures modest so foaming locks the pathway.

Best Practice Note

Confirm pre-wetting on very dry sections. Continue until steady backflow or dampening appears at the next port.

For Asset Maintenance (Specifier/Engineer): Infiltration at manhole penetrations

The Professional's Challenge

Intermittent inflow and seasonal wet/dry cycling cause prior repairs to shrink and open up.

The Adheseal Solution: Engineered Certainty in Practice

Specify Mountain Grout Flexible for its hydrophobic chemistry and closed-cell structure that retains volume through cycles. Dose Accelerator “B” ~1.25% for controlled rise (start ~50 s, complete ~4 min at 25 °C) to ensure thorough grout development around the penetration.

Best Practice Note

Map inflow points and port from least to most active. Validate seal by observing reduction in infiltration under normal head.

For Civil Contractors (Business Owner/Operator): Rapid mobilisation on tunnels or culverts

The Professional's Challenge

Multiple leak points with limited possession windows demand fast setup and predictable outcomes.

The Adheseal Solution: Engineered Certainty in Practice

Single-component pumping streamlines plant and labour. Hydrophobic reaction tracks water to seal beyond visible defects, reducing call-backs and downtime.

Best Practice Note

Sequence teams by zone, standardise Accelerator “B” dosages per ambient temperature band, and document backflow/pressure response for QA.