PU Waterproofing
Seamless liquid polyurethane membrane with >400% elongation and outstanding UV resistance.
What Is PU Waterproofing?
Polyurethane (PU) waterproofing cures into a joint-free, rubber-like membrane that contours around every corner, pipe, and parapet. With over 400% elasticity, it bridges active hairline cracks effortlessly and resists severe UV radiation.
At SAINI WATERPROOFING, our core philosophy is diagnosis before prescription. Rather than applying superficial coats that fail after a few months, our civil waterproofing specialists investigate the underlying structural dynamics—including capillary suction, structural expansion, and chemical degradation—to install a multi-layer impermeable barrier built to keep water out permanently.
Common Symptoms & Failure Causes We Diagnose
Book On-Site Inspection
Speak directly with our senior site engineers. We inspect your property, trace the leakage origin, and provide an itemized written quote.
✓ Zero inspection obligation
✓ Transparent rate card per sq.ft
✓ Formal documented warranty certificate
Possible Waterproofing Systems for this Application
Polyurethane (PU) Liquid Membrane
Superior UV resistance, crack bridging elongation (>400%), and 100% seamless barrier over complex architectural contours.
APP Modified Bituminous Membrane
Torch-applied heavy-duty prefabricated sheet with non-woven polyester core, ideal under screed on large flat roofs.
Acrylic / Elastomeric Hybrid Coating
Breathable, solar heat reflective coating for external facades and medium-traffic terraces.
Cementitious Crystalline System
Insoluble microscopic crystal growth inside concrete pores to permanently resist high hydrostatic pressure.
Get Your Site Moisture & Crack Diagnostic
Our technicians carry digital moisture meters to test your surface on-site.
Our Standard Engineering Process
Every waterproofing system is applied following a 6-step civil engineering protocol to eliminate failure points and ensure maximum longevity.
Diagnostic Site Inspection
Moisture mapping, structural crack classification, slope calculation, and core sample assessment.
Surface Preparation & Profiling
High-pressure washing, mechanical grinding, and removal of dead coatings, algae, and loose laitance.
Crack & Joint Treatment
Polymer mortar V-grooving, PU sealant injection, and fiber mesh reinforcement across corner coves and parapets.
Primer & System Application
Deep-penetrating primer followed by multi-coat engineered membrane (PU, APP, Crystalline, or Elastomeric).
Critical Detailing & Drainage Sealing
Flashing terminations, pipe collar encapsulation, drain spouts, and expansion joint sealing.
Final Quality Inspection & Handover
24-48 hour flood/pond testing where applicable, dry film thickness (DFT) verification, and formal warranty issuance.
Before & After Project Transformation
Real photographic proof of deteriorated damaged structures restored to 100% watertight integrity.
Identified Failure Mode
Aged surface screed with open shrinkage fractures and pooling water penetrating the slab below.
Applied Engineering Solution
Surface mechanical grinding, PU polymer mortar crack sealing, and 3-coat heavy elastomeric membrane.
PU Waterproofing FAQs
Other Solutions in TERRACE & ROOF WATERPROOFING
Acrylic Waterproofing
Cost-effective elastomeric acrylic copolymer coatings with solar heat reflection for mild-traffic roofs.
APP Membrane Waterproofing
Torch-applied Atactic Polypropylene modified bituminous sheet membrane for extreme puncture resistance.
Industrial Shed Waterproofing
Specialized seam sealing, J-bolt encapsulation, and protective coatings for large industrial factory roofs.
Re-Waterproofing
Restoration and rejuvenation of failed or aging waterproofing systems without structural destruction.
Roof Leakage Repair
Pinpoint diagnostic detection and localized high-performance sealing for active rooftop leaks.
Metal Roof Waterproofing
Anti-corrosion elastomeric waterproofing and seam sealing for commercial metal sheet roofing.
Book PU Waterproofing Inspection
Direct consultation with our senior civil waterproofing engineers. Written report and certified warranty on execution.