A spray polyurea waterproofing system for prepared concrete roofs, industrial flat roofs and exposed roof decks with drains, parapets, pipe penetrations and equipment bases. It forms a seamless waterproofing membrane over primed concrete and adds an exposed protective topcoat to support long-term roof durability under outdoor weathering.
Concrete primer interface + seamless spray polyurea waterproofing membrane + exposed polyaspartic protective topcoat
Concrete pore sealing and adhesion support for prepared roof substrates
Main seamless spray polyurea waterproofing membrane
Exposed polyaspartic protective topcoat for UV, weather and surface durability
The system separates concrete primer bonding, main seamless waterproofing and exposed surface protection, helping reduce substrate-related defects, roof leakage risk and outdoor aging on prepared concrete roof projects.
BW8009 seals prepared concrete, reduces uneven absorption and supports adhesion before the spray membrane is applied. It helps create a more stable primer interface on porous, dusty or mineral concrete roof substrates after proper surface preparation.
BW3-900 forms the main continuous spray polyurea waterproofing membrane over the primed concrete roof surface. It helps reduce leakage paths across large roof areas and around parapets, drains, pipe penetrations, equipment bases, cracks, corners and transitions.
BW0-8029 is applied as the exposed protective topcoat over the BW3-900 membrane. It helps improve UV resistance, weathering resistance, surface durability, color stability and maintainability when the roof waterproofing membrane remains exposed.
Concrete roof leakage often starts from small weak points: dusty or porous concrete, cracks, parapet wall roots, roof drains, pipe penetrations, equipment bases, expansion joints, corners, transitions and ponding water zones. The BW8009 + BW3-900 + BW0-8029 system helps reduce these risks through a controlled route from substrate preparation to primer bonding, seamless membrane formation and exposed-surface protection.
Concrete roof waterproofing starts with a solid, clean, dry and stable substrate. Remove loose concrete, laitance, dust, oil, standing water and weak surface layers, then review cracks, parapets, drains, pipe roots, equipment bases, expansion joints, slope and ponding water areas before primer application.
Apply BW8009 to seal prepared concrete, reduce surface absorption and support adhesion before the spray membrane is applied. Primer coverage, substrate dryness and recoat condition should be controlled so BW3-900 is sprayed over a stable primed surface.
Spray BW3-900 as the main seamless waterproofing membrane over the primed concrete roof. The membrane should continuously cover field areas and roof details such as parapet wall roots, drains, pipe penetrations, equipment bases, cracks, corners, transitions and movement-sensitive areas after proper detail treatment.
Apply BW0-8029 over the BW3-900 membrane as the exposed protective topcoat. It helps protect the roof surface from UV exposure, rain, weathering, color aging, maintenance traffic and long-term outdoor service conditions.
System-relevant values for spray polyurea roof waterproofing: concrete adhesion, membrane crack-resistance, impermeability and exposed topcoat durability.
| Item | Test standard / reference | Result |
|---|---|---|
| Density g/cm³ | GB/T 6750-2007 | 1.02 |
| Solid content | Product Information | >60% / >60% |
| Concrete adhesion | ASTM D-3359 | 3.5 MPa or substrate broken |
| Viscosity (cps) @ 25°C | Product Information | Part A 220 / Part B 260 |
| Temperature variation resistance | GB/9278-1988 | -40 to +180°C, 24 h: normal |
| Salt resistance | GB / T 9274-1988 reference | 50 g/L, 30 d: no corrosion, blistering or peeling |
| Alkali resistance | GB / T 9274-1988 reference | 50% NaOH, 30 d: no corrosion, blistering or peeling |
| Item | Test standard / reference | Result |
|---|---|---|
| Elongation | GB / T 23446-2009 | 482% |
| Tear strength | GB / T 23446-2009 | 85 kN/m |
| Gel time @ 25°C | Product Information | 4-6 s |
| Tensile strength | GB / T 23446-2009 | 22 MPa |
| Solid content | Product Information | 100% / 100% |
| Impermeability | GB / T 23446-2009 | 0.4 MPa / 2 h, impermeable |
| Item | Test standard / reference | Result |
|---|---|---|
| Impact strength | GB / T 1732 | 50 kg·cm |
| Abrasion resistance | HG / T 3831-2006 | 5 mg |
| Tensile strength / elongation | ASTM D-412 | 20 MPa / 200% |
| Accelerated aging | GB / T 14522-1993, 1000 h | Gloss loss <1; chalking <1 |
| Water resistance | Chemical Resistance | 48 h, no bubbles, wrinkles, color change or peeling |
The above values are selected from the current product-detail Product Information, Physical Properties and Chemical Resistance tables. Final film thickness and suitability should be confirmed according to substrate condition, service exposure, detail design, project specification and the latest approved technical data sheet.
Before handover, key inspection should focus on concrete roof readiness, BW8009 primer condition, BW3-900 membrane continuity, roof detail treatment and BW0-8029 exposed topcoat quality.
Confirm the roof substrate and primer condition before spray membrane application.
Review the spray polyurea membrane across roof areas and details before topcoat application.
Check the exposed topcoat and final roof condition before delivery.
Use these checks to judge whether the BW8009 + BW3-900 + BW0-8029 spray polyurea system is suitable before final specification, and when another roof waterproofing system may be more appropriate.
For prepared concrete flat roofs, industrial roofs and exposed concrete roof decks where surface strength, dryness, slope and drainage can meet primer and spray membrane requirements. Key review: concrete roof, dryness and drainage.
For roofs with parapets, drains, pipe penetrations, equipment bases, expansion joints, corners and transitions where seamless spray membrane continuity is required. Key review: parapets, drains and penetrations.
For exposed concrete roof waterproofing projects where the BW3-900 membrane needs BW0-8029 topcoat protection against UV, weathering, rain and maintenance traffic. Key review: UV exposure, topcoat and durability.
For old SBS or bitumen membrane renovation, metal roofs, hand-applied small-area repairs or basement garage roof decks with overburden layers, choose a dedicated system design instead. Key review: old membrane, metal roof and buried deck.
Do not finalize system selection from roof area alone. Confirm concrete condition, moisture, surface strength, cracks, slope, drainage, ponding water risk, roof details, spray access, target DFT, exposure level and inspection requirements before ordering. Long-term ponding water areas may require additional drainage or detail design review.
Common questions about using the BW8009 + BW3-900 + BW0-8029 spray polyurea system for prepared concrete roof waterproofing projects.
