GacoDeck
GacoDeck Maintenance Manual
GacoDeck systems are seamless, two-component, urethane membranes that incorporate organic granules for added slip resistance. The synthetic rubber-like finish of GacoDeck systems won't shrink, crack, chip, peel, lift, or buckle from normal expansion and contractions caused by temperature shifts or freeze/thaw cycles. When properly applied, GacoDeck systems will prevent leaks in your structure.
INSPECTIONS
GacoDeck surface membrane should be inspected at a frequency of twice a year. It is recommended that inspections and repairs be made in the early spring and in the late fall. Repairs are difficult to achieve during the winter season.
Items to look at include
- Cuts, tears, or delamination of the coating.
- Flashing at curbs, walls, penetrations and drains.
- Areas of heavy wear exposing concrete substrate.
- Spalling or structural damage to the substrate.
MAINTENANCE AND REPAIR
Superficial Cuts and Surface Damage
Clean the surface free of oil and grease or any accumulated soil using a liquid detergent and a thorough rinse of clear water. Wiping with GacoFlex T-5112 solvent can be used in lieu of a detergent provided that all oil and grease is removed from the surface and not just spread around. When area is completely dry, apply GacoFlex U-66 Series urethane coating at the rate of one gallon per 100 square feet (4.1L/10m2). Allow to cure 48 hours before subjecting to traffic. See attached product data sheet for specific instructions on the use of U-66 Series urethane.
Cuts, Delaminations, and Areas of Heavy Wear
Remove all loose coating, cutting back to a firm, secured membrane. Clean thoroughly with a liquid detergent followed by a clear water rinse. When the area is completely dry, prime the concrete with GacoFlex E-5320 epoxy primer applied at the rate of ½ gallon per 100 square feet (2 L/10m2). (No primer is necessary on plywood.) Carry E-5320 several inches onto the existing membrane. Allow the E-5320 to fully cure in accordance with the attached GW-2-2, Priming Instructions. Apply GacoFlex U-66 Series urethane at the rate of one gallon per 100 square feet (4.1 L/10m2) (16 wet mils (.4 mm)), carrying coating onto the edge of the old membrane and feathering out so as not to leave an abrupt edge. When cured apply GacoFlex U-66 urethane at the rate of one gallon per 100 square feet (4.1 L/10m2). Broadcast 18/40 (1 mm/.42 mm) Shelfil Granule into the wet coating to uniformly cover the surface. When texture coat has cured, sweep loose granule and apply two coats of GacoFlex U-66 urethane in the desired color at the rate of one gallon per 100 square feet (4.1 L/10m2) per coat. After final coat, allow a minimum of 48 hours curing time before subjecting surface to traffic.
Recoating For Cosmetic Purposes
To recoat a deck to change color or to improve overall appearance, the entire surface must first be cleaned with a liquid detergent and thoroughly rinsed with clean water. All dirt, grease and accumulation of soil must be removed. After the surface has completely dried, apply GacoFlex U-66 Series urethane coating at the rate of one gallon per 100 square feet (4.1 L/10m2). Allow 48 hours before subjecting to traffic.
Repair of Damaged, Spalled or Structurally Unsound Concrete
Remove loose concrete to a firm substrate, and loosen and remove coating back to a firm edge. Fill voids or spalled areas with 100% solids epoxy sand grout and allow to cure. (See
GW-1-1). Surface of grout should have a slight "tooth" and should not be glazed. Repair as per paragraph B.
Repair of Delaminated Plywood or Replacement of Defective Plywood and Correction of Defective Nailing
- Small areas of single ply delamination can be cut out, refitted to size and bonded in place using U-66 coating as a contact adhesive. Coat both surfaces with U-66 and allow to dry a minimum of one hour but no more than three hours. Place the repair back into the space and firmly press into place. Recoat area as per paragraph B.
- Remove areas of defective plywood including rotted areas, multi-ply delamination or structurally damaged sections back to adequate structural support; i.e. joists, beams. Replace sections of plywood fitted to repair area. Nail with annular or spiral shank nails. With grinding disk, feather off old GacoDeck flush with plywood repair. Coat new plywood with U-66 at rate of one gallon per 100 square feet (4.1 L/10m2); then treat joints in accordance with GW-1 Detail. When dry, apply U-66 at one gallon per 100 square feet (4.1L/10m2) to repair area and broadcast 18/40 (1 mm/.42 mm) granule into wet coat to establish texture, feathering out on old deck surface. A cosmetic coat per C above can be applied for best uniform color.
- Defective nailing is usually apparent by "popped" nails that have backed-up out of the deck. This condition is usually due to the use of "smooth" shank nails. To repair, remove nails and renail with next size larger, non-rusting annular ring, spiral shank or hot-dipped galvanized nails. Repair area over nails per E.2. above.