A hand-applied roof renovation system for prepared old waterproofing layers where full membrane removal is not planned and project conditions allow overlay work. It helps reinforce repaired details, rebuild continuous waterproofing protection and add an exposed protective topcoat over aged roof waterproofing surfaces.
Wet detail coat + embedded polyester fabric reinforcement + full-area hand-applied polyurea membrane + exposed polyaspartic protective topcoat
Wet detail coat for seams, laps, cracks and weak detail zones
Embedded reinforcement material for repaired details, not an independent coating DFT layer
Full-area hand-applied polyurea waterproofing membrane
Exposed polyaspartic protective topcoat for UV and weather protection
The system separates detail reinforcement, full-area membrane renewal and exposed surface protection, helping reduce leakage paths, overlay failure risk and outdoor aging on prepared old waterproofing layer renovation projects.
A wet BW6-9528 coat with embedded polyester fabric is used at seams, laps, repaired cracks, drains, pipe roots, parapet corners, equipment bases and localized weak areas. This detail treatment helps improve continuity where movement, old edges or previous repairs may create leakage paths before the full-area membrane is applied.
BW6-9528 forms the main continuous hand-applied polyurea waterproofing membrane over the prepared old waterproofing layer. It helps rebuild waterproofing continuity across the roof surface and around repaired cracks, laps, drains, pipe roots, parapet corners, equipment bases and localized weak details.
BW0-8029 is applied as the exposed protective topcoat over the BW6-9528 membrane. It helps improve UV resistance, weathering resistance, color stability, surface durability and long-term maintainability when the renovated roof surface remains exposed.
Old waterproofing layer renovation risks often start from aged membranes, brittle or cracked areas, weak adhesion, chalking surfaces, old laps, repaired cracks, drains, outlets, pipe roots, parapet corners, equipment bases, blisters, hollow zones and movement around old joints. The BW6-9528 + polyester fabric reinforcement + BW0-8029 system helps reduce these risks through a controlled route from old membrane review to detail reinforcement, full-area membrane renewal and exposed-surface protection.
Inspect the existing waterproofing layer before overlay work begins. Check membrane type, age, adhesion, moisture, cracks, blisters, hollow areas, loose coating, dust, oil, old laps, drains, outlets, pipe roots, parapet corners and equipment bases. Weak, loose, wet, incompatible or failed areas should be removed, repaired or otherwise treated before product application.
Apply BW6-9528 as a wet detail coat at seams, laps, repaired cracks, drains, pipe roots, parapet corners, equipment bases and localized weak areas, then embed polyester fabric into the wet coating where reinforcement is required. Keep the fabric flat and fully wetted without wrinkles, hollow spots or loose edges.
Apply BW6-9528 as the main continuous hand-applied waterproofing membrane over the prepared old waterproofing layer and reinforced detail zones. The membrane should continuously cover repaired cracks, laps, drains, pipe roots, parapet corners, equipment bases and other weak details.
Apply BW0-8029 over the BW6-9528 membrane as the exposed protective topcoat when the renovated roof surface remains exposed. It helps protect the membrane surface from UV exposure, weathering, surface aging, color aging and long-term outdoor service conditions.
System-relevant values for old waterproofing-layer overlay renovation: flexible membrane renewal, reinforced details and exposed weather protection.
| Item | Test standard / reference | Result |
|---|---|---|
| Elongation | ASTM D-412 | 400% |
| Tear strength | ASTM D-624 | 52 kN/m |
| Tensile strength | ASTM D-412 | 17 MPa |
| Density g/cm³ | GB / T 6750-2007 | 1.25 |
| Concrete / steel adhesion | Physical Properties | 3.3 MPa concrete base / 8 MPa steel base |
| 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 | Loss of light <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 existing membrane suitability, BW6-9528 wet detail coat, polyester fabric embedment, BW6-9528 membrane continuity and BW0-8029 exposed topcoat condition.
Confirm that the old waterproofing layer is suitable for overlay renovation before product application.
Review the wet coat and embedded polyester fabric reinforcement at weak and detail zones.
Review the main membrane and exposed topcoat before handover.
Use these checks to judge whether the BW6-9528 + polyester fabric reinforcement + BW0-8029 system is suitable before final specification.
For existing waterproofing layers that can be inspected, cleaned, dried, repaired and compatibility checked before overlay coating.
For repaired cracks, old laps, seams and localized leakage zones where BW6-9528 wet coat and polyester fabric reinforcement can improve detail continuity.
For drains, outlets, parapet upturns, pipe roots, penetrations and equipment bases where detail reinforcement and membrane continuity are critical.
For old membrane roof renovation projects where the new waterproofing membrane remains exposed and needs BW0-8029 topcoat protection.
For small or medium renovation projects where hand application is preferred and specialized plural-component spray equipment is not convenient.
Do not assume every old waterproofing membrane can be directly covered. Confirm membrane type, adhesion, moisture condition, compatibility, repair scope, reinforcement details, exposure level and inspection requirements before final specification. Loose, hollow, lifted, blistered, wet, cracked or failed areas must be removed, repaired or otherwise treated before overlay coating.
Common questions about using BW6-9528 detail reinforcement, BW6-9528 main membrane and BW0-8029 exposed topcoat for old waterproofing layer overlay renovation.
