A spray polyurea waterproofing system for prepared concrete basement garage roof decks and buried concrete roof decks. It combines primer sealing, quartz-sand leveling repair and a seamless BW3-900 spray polyurea membrane to reduce leakage risk around deck surfaces, wall roots, drains, pipe penetrations and other detail areas.
Concrete primer sealing + quartz-sand leveling repair + seamless spray polyurea main membrane
Primer sealing and adhesion support for prepared concrete
Scrape-applied pore filling, leveling and local repair transition layer
Main seamless spray polyurea waterproofing membrane
The system separates concrete sealing, local surface repair and main membrane waterproofing so each layer has a clear role in reducing basement garage roof deck leakage risks.
BW8010 is applied as the first primer to seal prepared concrete, reduce uneven absorption and support adhesion before the repair layer and main membrane are applied. It helps create a more stable bonding base for the BW8010 quartz-sand repair layer and the BW3-900 spray polyurea membrane.
BW8010 blended with quartz sand forms a scrape-applied leveling and local repair transition layer over prepared concrete. It helps fill pores, honeycombs, pits and small uneven areas before the main membrane is sprayed, improving deck surface continuity without replacing the main waterproofing membrane.
BW3-900 is sprayed as the continuous main polyurea membrane across the deck and detail zones. It helps reduce leakage paths across the concrete deck and around wall roots, upturns, pipe penetrations, drains, outlets and equipment bases.
Basement garage roof deck leakage often starts from small weak points: porous concrete, honeycombs, pits, uneven deck areas, wall roots, upturns, drains, pipe penetrations, outlets or equipment bases. The BW8010 + BW3-900 spray system helps reduce these risks through a controlled route from substrate review to primer sealing, local repair and seamless membrane formation before later protection or overburden work begins.
Start with a prepared concrete deck before coating work begins. Check surface strength, dryness, laitance, pores, honeycombs, pits, uneven areas, slope and drainage, wall roots, upturns, corners, outlets, pipe penetrations and equipment bases so weak areas can be repaired before the waterproofing membrane is sprayed.
Apply BW8010 as the first primer to seal concrete capillary pores, reduce surface absorption and support adhesion before the repair layer. This step helps create a stable primer base, especially around wall roots, drains, outlets and other detail areas where bonding defects can become leakage paths.
Blend BW8010 with quartz sand for scrape-applied leveling and local surface repair. This repair transition layer helps fill pores, honeycombs, pits and uneven deck areas before BW3-900 is sprayed, but it should not be treated as the main waterproofing membrane.
Spray BW3-900 as the seamless main waterproofing membrane over the prepared and repaired concrete deck. The membrane should turn up wall roots and vertical faces and wrap corners, pipe roots, drains, outlets and equipment bases so the deck waterproofing layer remains continuous before protection or overburden layers are installed.
System-relevant values for basement garage roof deck waterproofing: concrete sealing, repair leveling, membrane continuity and impermeability.
| Item | Test standard / reference | Result |
|---|---|---|
| Density | GB / T 6750-2007 | 1.02 g/cm³ |
| Solid content | Product Information | ≥98% |
| Concrete adhesion | ASTM D-3359 | 3.5 MPa or substrate broken |
| Temperature variation | GB / T 9278-1988, -40 to +150°C, 24 h | Normal |
| Salt resistance | 50 g/L, 30 d | No corrosion, no blistering, no peeling |
| Alkali resistance | 50% NaOH, 30 d | No corrosion, no blistering, no peeling |
| Item | Test standard / reference | Result |
|---|---|---|
| Elongation | GB / T 23446-2009 | 482% |
| Tear strength | GB / T 23446-2009 | 85 kN/m |
| Solid content | Part A / Part B | 100% / 100% |
| Gel time @ 25°C | Product Information | 4-6 s |
| Tensile strength | GB / T 23446-2009 | 22 MPa |
| Abrasion resistance | HG / T 3831-2006 | 4.2 mg |
| Impermeability | GB / T 23446-2009 | 0.4 MPa / 2 h, impermeable |
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 later protection or overburden work begins, key inspection should focus on concrete deck readiness, BW8010 primer coverage, quartz-sand repair quality and BW3-900 membrane continuity.
Confirm the basement garage roof deck before primer application.
Check whether the primer and quartz-sand repair areas are ready for the main spray membrane.
Review the BW3-900 spray polyurea membrane before later construction work begins.
Use these checks to judge whether the BW8010 + BW3-900 spray polyurea waterproofing system is suitable before final specification.
For prepared concrete decks above basement garages where surface strength, dryness, cleaning quality and detail preparation can meet primer and spray membrane requirements.
For deck areas with pores, honeycombs, pits or local unevenness that require BW8010 quartz-sand leveling repair before the main membrane is sprayed.
For wall roots, vertical faces, inner corners and outer corners where continuous membrane upturns and corner wrapping are required to reduce leakage paths.
For pipe roots, drains, outlets and equipment bases where the membrane must wrap details and remain continuous with the field membrane. Review penetrations before confirming suitability.
For projects where spray equipment access, protection-layer timing and later overburden work can be planned before membrane application. If spray access is not practical, review a separate hand-applied system route instead of mixing it into this BW3-900 spray build-up. Review protection layers before confirming suitability.
Do not treat BW8010 quartz-sand leveling repair as the main waterproofing membrane. The main continuous waterproofing layer in this system is BW3-900 spray polyurea. Final system selection should confirm concrete condition, moisture, repair scope, detail geometry, spray access, target membrane thickness and later construction requirements.
Common questions about using BW8010 and BW3-900 for concrete basement garage roof deck waterproofing.
