Words of Wisdom When Working With Pecora-Deck Traffic Coatings
In order to meet the ever-growing demands of the market, and to expand our architectural weatherproofing product offerings, Pecora acquired Carlisle Coatings and Waterproofing deck coatings in 2012. Since the purchase of the product line, Pecora has worked to push research and development into evolving the products to better serve the needs of the customer. From the initial launch of the Pecora-Deck 800 Series, to subsequent accessory products, to the recent institute of the high build coating membrane, Pecora-Deck HB1000, Pecora has become a competitive player within the market.
Over the years, we have captured the experience that comes with countless deck coating applications whether through research, assistance out in the field, or trainings with customers. And in response, we have developed a comprehensive list of important points to remember when applying Pecora-Deck traffic coating products. In the end, the devil is in the detail, which is very much the case when achieving a quality urethane deck coating installation. Although some of the points on this list may seem evident, it never hurts to refresh one’s memory.
Unvented Metal Pans & Between Slab Systems: Pecora urethane coatings are vapor barrier systems and should not be applied over exterior concrete decks that have been constructed over unvented metal pans or onto exterior concrete decks that have a between-slab membrane system underneath.
This is important because any existing moisture in the concrete slab at the time of coating installation, will be trapped in the slab and could potentially present future issues. These possible problems are relative to moisture vapor drive and effects on the adhesive bond line of the installed coating.
Minimum Surface Temperature: Surface temperature should always be 40°F or above whenever epoxy primers or Pecora urethane coatings are being applied.
If applied below 40°F, the cure of the coating will be significantly slowed down and extend the time needed to complete installation processes.
Material Quantities: All material quantities given in the Pecora Application Manual and Pecora Specification sheets assume perfectly flat and smooth surfaces. As the profile of concrete tends to vary, material quantity estimates should be increased accordingly. In addition, material left in lines or containers and loss due to overspray should be taken into consideration when estimating.
Mixing: Mix all materials thoroughly prior to use. Read label directions carefully, especially on two-component products.
Proper mixing ensures that chemically curing or catalyzed systems are homogeneous, which will guarantee proper and uniform cure profiles. If color packs are being utilized, thorough mixing conducted according to manufacturer’s instructions will ensure uniform and accurate colors are achieved.
Cleaning Concrete Before Application: Acid Etching or Shot-Blasting is required on all concrete surfaces prior to application of the Pecora urethane waterproofing systems. Consult a Pecora Representative for job to job recommendations or for alternate methods of surface preparation.
This is conducted to assure a proper bonding surface is crested prior to coating installation.
Moisture Content of Concrete: Never coat wet or moist surfaces. When in doubt, consult a moisture meter or perform a plastic mat test.
Solvent-Based: Solvent based products are incompatible with asphaltic compounds.
This is important because certain solvents will solubilize asphaltic compounds that are present on a surface that is to receive a coating, causing sever discoloration of the installed coatings.
Consult a Representative: Do not mix combinations of different coating material (different part numbers) without consulting an authorized representative.
Chemical incompatibilities will occur resulting in a multitude of potential issues not limited to, non-existent or incomplete sure, color variation, compromised physical properties, and coating durability.
Masking: It is much easier to use caution or to use masking to keep off an adjacent surface during application than to remove it after cure.
Masking prevents a coating from coming in contact with a surface that is not desired or intended to be coated. Removing the masking once coating is applied reveals a clean uncoated surface and avoids clean-up that can be very costly and sometimes impossible.
UV Exposure: Pecora 802 Base Coat is not designed for extended ultra-violet exposure.
Any coating intended for extended exposure, meaning more than 30 days, generally will begin to degrade from ultraviolet light. Generally speaking, only “Top Coats” are intended to be exposed to UV for extended periods of time.
Primers: In systems requiring the use of primers, the urethane coatings materials must be applied the same day the primer is applied, otherwise lightly re-prime.
This is important because primers generally have a window of optimum adhesive properties. The primer could also be contaminated by wind blown dust or dirt as well as effected by UV exposure.
Imminent Weather: Never apply the primer or urethane elastomeric coatings when precipitation is imminent.
Water adversely effects the cure profile of urethane coatings resulting in excessive CO2 production within the cross section of the applied coating. The excessive CO2 will reveal itself as swelling, blistering, and/or foaming of the applied coating.