POLYDECK 400

The Polydeck^® 400 Pedestrian Traffic Deck System is a polyurethane, liquid applied, moisture-cured waterproofing system with a Class A Fire Rating on 3/4” (1.9 cm) or 21/32” (1.67 cm) plywood. The system utilizes an epoxy primer, two coats of an aromatic polyurethane basecoat and two coats of an aliphatic polyurethane topcoat.

 POLYDECK 400 is a liquid-applied, moisture-cured, polyurethane waterproofing and pedestrian traffic coating system. It is specially designed for pedestrian decks and offers superior resistance to chemicals, UV exposure, and freeze-thaw cycles. The system is Class A Fire Rated when applied on 3/4” or 21/32” plywood and is suitable for applications requiring high-performance waterproofing over occupied spaces.

 The POLYDECK 400 system consists of:

·       Primer: Polyprime 2180SC or Polyprime 21. For porous or outgassing concrete, Polyprime EBF-LV is recommended.

·       Joint Treatment Paste: A mix of PC-440/440SC/440SF and PC-50 Accelerator.

·       Base Coat: PC-440, PC-440SC, or PC-440SF (applied in two coats).

·       Aggregate Broadcast: Dry, washed, rounded 20-mesh sand with 6.5+ Mohs hardness.

·       Topcoats: First topcoat of Polyglaze 400FR/400FR-C/400FR-SC followed by Polyglaze 400/400C/400SC.

 Ideal for use on balconies, patios, sun decks, walkways, stairs, and decks over occupied spaces. Can be used on both plywood and concrete substrates that meet preparation and strength standards.

·       Primer Application: At 1 gallon per 300 sqft, resulting in a 4 dry mils membrane.

·       Base Coat Application: First coat at 3 gallons/100 sqft (33.3 sqft/gallon), followed by a second coat at 1.5 gallons/100 sqft (75 sqft/gallon), resulting in 33–48 dry mils and 16–22 dry mils respectively.

·       Aggregate Broadcast: 100 lbs per 100 sqft into the second coat.

·       Topcoat Application:

o   Polyglaze 400FR: 1.25 gallons/100 sqft (80 sqft/gallon) giving 13–16 dry mils.

o   Polyglaze 400: 0.75 gallon/100 sqft (75 sqft/gallon) giving 8–10 dry mils.

·       Finished System Thickness: Total of 70–94 ± 5 dry mils excluding aggregate.

·       Cure Time: Final cure before heavy traffic is 72 hours at 75°F and 50% RH.

·       Pot Life: Mixed material (e.g., PC-50 and basecoat) must be used within 20 minutes.

·       Substrate Requirements: Concrete must be at least 3000 psi and cured for 28 days; plywood must be APA rated exterior grade.

·       Temperature & Humidity Limits: Application must occur at least 5°F above the dew point, ideally around 75°F and 50% RH.

·       UV Resistance: Topcoats include aliphatic polyurethane for UV stability.

·       Environmental Conditions: Not suitable for on-grade slabs, sandwich slabs, or surfaces with hydrostatic pressure.

·       Recoat Window: Primer must not sit more than 12 hours before recoat; otherwise, surface needs solvent wiping and re-priming.

·       Storage: All components have a shelf life of 1 year in factory-sealed containers stored between 60–95°F.

https://www.polycoatusa.com/system.php?systemName=Polydeck%C2%AE%20400