Description
The Polydeck® MR (Mechanical Room) system is a liquid-applied, high solids, moisture-cured waterproofing system. The system utilizes an epoxy primer, a high tensile polyurethane base coat and an aromatic, moisture-cured polyurethane topcoat to complete the system. Polydeck® MR is a user-friendly application specifically designed to be tough and durable.
Material Use:
POLYDECK MR is a high-solids, moisture-cured, liquid-applied waterproofing system designed specifically for mechanical rooms. It provides a seamless, elastomeric, durable barrier that withstands structural movement, protects against spalling, freeze/thaw damage, and chemical exposure. The system is ideal for environments requiring a resilient and recoatable waterproofing solution.
System Components:
The system comprises a three-coat application:
· Primer: Polyprime 2180SC or Polyprime EBF-LV (for porous/rough concrete or outgassing risk).
· Base Coat: PC-220SC (or substitute Poly-I-Gard 295).
· Top Coat: Poly-I-Gard 246SC (or substitute Poly-I-Gard 295).
Optional: PC-50 mixed with PC-220SC for detailing joints, cracks, and flashings. Straight Jacket Tape is used to reinforce treated areas.
Applications:
Primarily used in mechanical rooms, this system is suitable for properly prepared concrete or plywood substrates. Not suitable for on-grade slabs, split or sandwich slabs, unvented metal pans, or structurally compromised surfaces (<3000 psi). For asphalt surfaces, pre-coating with Polycoat PC-IM 129 is required.
Application Details:
· Primer Coverage:
o Polyprime 2180SC: 1 gal / 300 sqft (3 dry mils).
o Polyprime EBF-LV: 1 gal / 200 sqft (rate varies by substrate porosity).
· Base Coat (PC-220SC or Poly-I-Gard 295):
o 2 gal / 100 sqft → 28 ± 2 dry mils (PC-220SC) or 30 ± 2 dry mils (Poly-I-Gard 295).
· Top Coat (Poly-I-Gard 246SC or 295):
o 1 gal / 100 sqft → 14 ± 2 dry mils, broadcast with 10 lbs / 100 sqft of 20 mesh dry, rounded sand.
· Final System Thickness:
o Without sand: 48 ± 5 dry mils.
o With sand: 56 ± 5 dry mils.
Special Notes:
· Pot Life: Mix only as much as can be used within 20 minutes (especially relevant for PC-220SC/PC-50 mixture).
· Curing Time: Allow 6–8 hours after joint treatment and overnight curing after topcoat before traffic exposure.
· Temperature & Humidity Limits:
o Substrates must be ≥3000 psi and ≥28 days cured for concrete.
o Application temperature must be 5°F (3°C) above dew point, within 60–95°F (15–35°C).
o Avoid application under high humidity or risk of condensation.
· Primer Recoat Window: Must be coated within 12 hours of curing; otherwise, re-prime after solvent wipe.
· UV Stability: Not specifically noted as UV stable or resistant; system is primarily intended for interior mechanical rooms.
· Coverage Efficiency:
o Primer: up to 300 sqft/gal.
o Base Coat: 50 sqft/gal.
o Top Coat: 100 sqft/gal.
Limitations:
Do not use on unvented metal pan decks, sandwich assemblies, or low-integrity concrete. Not suitable for rising water tables or hydrostatic pressure environments. Substrate must be sloped for drainage. Follow surface preparation guidelines strictly for optimal performance.
https://www.polycoatusa.com/system.php?systemName=Polydeck%C2%AE%20MR
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