Roof and terrace waterproofing: protected and exposed PU systems
Tap a number on the section to see the material layers for each roof type.
Tap a number on the drawing to see the materials
- Liquid polyurethane / polyurea membrane
- Weathering top coat
- HDPE / TPO sheet membrane
Click a number on the drawing to see the materials at that location
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Roof slab with protection layer
Keshun FL1101Epoxy primer · 0.2 kg/m²
Keshun Aquacoat KS-929CPolyurethane membrane · 1.4 kg/m² · 2 coats
Layers and consumption
- Epoxy primer – Keshun FL1101: 0.2 kg/m²
- Polyurethane membrane – Keshun Aquacoat KS-929C: 1.4 kg/m² in 2 coats
- Quartz sand broadcast for key: 2.0 kg/m²
- XPS insulation, protective concrete, finishes: Per architectural drawings
Covered roofs: insulation, protective concrete or tiling above the membrane. Basis: VNA's set of standard waterproofing detail drawings.
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Exposed roof slab, terrace
Keshun FL1101Epoxy primer · 0.2 kg/m²
Keshun Aquacoat KS-929CPolyurethane membrane · 1.4 kg/m² · 2 coats
Keshun Aquacoat 680Weathering top coat · 0.3 kg/m²
Or: Keshun Aquacoat KS-20, Keshun XS-505
Layers and consumption
- Epoxy primer – Keshun FL1101: 0.2 kg/m²
- Polyurethane membrane – Keshun Aquacoat KS-929C: 1.4 kg/m² in 2 coats
- Weathering top coat – Keshun Aquacoat 680: 0.3 kg/m²
Alternatives: Keshun Aquacoat KS-20 – Spray-applied two-component polyurea replacing the main membrane, for large areas; needs dedicated spray equipment (per VNA standard detail drawings); Keshun XS-505 – Water-based exposed waterproof coating for concrete roofs (per TDS).
The membrane works directly under sun and rain, with no protection layer. Basis: VNA's set of standard waterproofing detail drawings.
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Planters, roof gardens
Keshun FL1101Epoxy primer · 0.2 kg/m²
Keshun Aquacoat KS-929CPolyurethane membrane · 1.4 kg/m² · 2 coats
Layers and consumption
- Epoxy primer – Keshun FL1101: 0.2 kg/m²
- Polyurethane membrane – Keshun Aquacoat KS-929C: 1.4 kg/m² in 2 coats
- Quartz sand broadcast, protective screed, geotextile: Per detail drawings
Inside face of the planter, under the growing soil. Basis: VNA's set of standard waterproofing detail drawings.
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Metal roof
Keshun Aquaprufe APF-D100Self-adhesive TPO membrane · Per TDS; dedicated primer 0.20–0.30 kg/m²
Or: Keshun Aquacoat 680, Keshun Aquaprufe TPO
Layers and consumption
- Butyl self-adhesive TPO membrane – Keshun Aquaprufe APF-D100: Per TDS; dedicated primer 0.20–0.30 kg/m²
Alternatives: Keshun Aquacoat 680 – Exposed polyurethane (per TDS: concrete and metal roofs); Keshun Aquaprufe TPO – Exposed TPO roofing membrane; type P mechanically fastened (per Keshun catalogue).
Top of the roof sheeting. Basis: the manufacturer's technical data sheet (TDS).
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Factory roof requiring FM Approval
Keshun Aquaprufe TPOTPO roofing membrane, heat-welded seams · Type P mechanically fastened; type L fully adhered to concrete decks; type H for single-ply roofs and details
Layers and consumption
- TPO roofing membrane, heat-welded seams – Keshun Aquaprufe TPO: Type P mechanically fastened; type L fully adhered to concrete decks; type H for single-ply roofs and details
Top of the roof, fully exposed. Basis: the manufacturer's product catalogue.
Illustrative sections. Systems follow VNA's standard waterproofing detail drawings and the manufacturers' TDS; the final selection follows the project's design documents.
Application steps
Keshun Aquacoat KS-929C – 5 steps
- Substrate: cured, sound concrete, free of oil and dust; repair cracks and honeycombs.
- Apply Keshun FL1101 epoxy primer.
- Stir gently and evenly with a mixer to limit air entrainment; use within 30 minutes.
- Apply the first coat in one direction; let dry 6–12 hours.
- Apply the second coat at right angles to the first; allow 24 hours to cure.
Notes: Not for drinking-water or food-contact tanks. Exposed surfaces: protect with a Keshun Aquacoat 680 top coat.
Per Keshun Aquacoat KS-929C TDS (2024). See Keshun Aquacoat KS-929C specifications and documents.
Products in these systems
KeshunKeshun FL1101Two-component solvent-free epoxy primer TDS · 7 pages
KeshunKeshun Aquacoat KS-929CSingle-component liquid-applied polyurethane membrane TDS · 35 pages
KeshunKeshun Aquacoat 680Weathering-grade polyurethane membrane for exposed use TDS · 7 pages
KeshunKeshun Aquacoat KS-20Spray-applied two-component polyurea TDS · 5 pages
KeshunKeshun XS-505Exposed acrylic rubber-emulsion waterproof coating TDS · 5 pages
KeshunKeshun Aquaprufe APF-D100Butyl self-adhesive TPO membrane TDS · 26 pages
KeshunKeshun Aquaprufe TPOTPO roofing membrane (types H, L, P) Catalogue pageWaterproofing detail drawings
View online or download PDF and DWG
Standard waterproofing details – deep basements (3–4 levels)Standard waterproofing notes and typical details for buildings with 3–4 basement levels.View 4 pages
Standard waterproofing details – 2 basements, bored pilesStandard waterproofing notes and typical details for buildings with 2 basement levels on bored piles.View 5 pages How VNA supports your project
- System proposalsbased on your drawings and site conditions
- Submittal dossiersTDS and test reports ready in the technical library
- Waterproofing detail drawingsPDF and DWG for design teams
- Quotations & site guidanceby project quantity and schedule
Warranty: Under VNA's supervision and records, the manufacturer issues a product warranty certificate for the project; the product warranty period is 10 years.
Frequently asked questions
How much polyurethane does a roof slab take per m²?
VNA's standard detail drawings specify Keshun FL1101 epoxy primer at 0.2 kg/m² and Keshun Aquacoat KS-929C at 1.4 kg/m² in 2 coats. The KS-929C data sheet states 1.6–1.8 kg/m² per 1 mm film; actual consumption depends on the substrate.
Can a polyurethane membrane be left exposed?
Standard PU membranes need a UV-resistant top coat or a protection layer when exposed. Keshun Aquacoat 680 is a weathering-grade PU used directly on exposed surfaces such as concrete roofs, metal roofs and terraces.
Polyurethane or polyurea for roofs and terraces?
Both form seamless, elastic liquid-applied membranes. Single-component polyurethane is applied by trowel, squeegee or roller and suits most roofs, balconies and bathrooms. Hot-spray two-component polyurea cures very fast with high strength, suiting large areas and early return to service; it needs dedicated spray equipment.
Need a material system for the whole project?
Pick a project type to see the full-building section, or send us your drawings for a proposal.