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Car Park Liquid Membrane Waterproofing System:  

Vulkem 350/345/346 Traffic Deck Coating System  

1. Purpose 

The purpose of this document is to establish uniform procedures for applying the Vulkem 350/345/346 TRAFFIC DECK COATING SYSTEM.

2. Scope 

2.1 This document will provide the necessary instructions for the application of the VULKEM 350/345/346 TRAFFIC DECK COATING SYSTEM to quality for the manufacturer's warranty.  

3. Conditions for concrete surfaces 

3.1 Concrete shall be water cured and in place for at least 14 days, preferably for 28 days. 

3.2 Concrete shall be finished with a light steel trowel followed by a fine hair broom or equivalent finish. 

3.3 Surface to receive coating, sealant or liquid applied flashing material shall be sound, dry, clean and free of all dirt, dust, oil, grease, wax, tar, asphalt, mildew, mold, paint, sealers, coatings, curing agents, loose particles, laitance and other contaminants or foreign matter which may interfere with the adhesion. Job-site conditions may require use of a Vulkem Primer. Consult a Tremco Representative for recommendations prior to installing materials. 

3.4 The condition of "dry" shall be determined by fastening a rubber mat to the concrete deck for a minimum of six hours. The mat shall be located in an area exposed to the sun. After six hours (minimum), the surface beneath the rubber mat shall show minimal evidence of moisture or dampness. 

3.5 Structural or shrinkage cracks in the concrete surface which are greater than 3mm wide shall be ground out to a minimum of 6mm x 12mm deep. 

3.6 In the event of exposed reinforcing steel, the exposed portions of steel shall be ground to expose clean, bright, metal and primed with Vulkem Non Porous Primer. 

3.7 Surface shall be made free of defects which may telegraph and show through the finished coating. Repaired areas must be primed with Tremproof 200EC or Primer 171. 

3.8 All drains shall be cleaned and operative. Drains shall be recessed lower than the deck surface. The surface shall be sloped to the drain to provide positive drainage. Primer may be required. See section 5. 

3.9 At any point where the coating will terminate in an area subject to traffic, cut 6mm x 6mm keyway and terminate the coating into the keyway. 

3.10 If the project is restorative in nature, old sealant and backing material material shall be removed. The joint interface may require a thorough wire brushing, grinding, sandblasting, solvent washing and/or a primer. Consult your Tremco Representative.  

4. Special Surfaces 

4.1 Vulkem 350/351 requires TREMprime Non-Porous Primer on metal surfaces. Lap joints must be sealed with Dymonic NT and coated with Vulkem 350 in order to cover seams, bolts and rivets prior to applying the system.  

5. Materials 

5.1 Recommended materials and their uses are as follows: DYMONIC NT: A single-part moisture curing, gun grade polyurethane sealant for use in sealing cracks, expansion joints, control joints, control joints and for use in forming fillets. VULKEM 350 COATING: A one-part, polyurethane coating used as the elastomeric, waterproofing basecoat, available in both R (roller)  

VULKEM 345 COATING: A one-part, Low VOC aliphatic polyurethane topcoat provides a chemical and UV resistant, colour stable, weatherproof wearing surface. VULKEM 346 COATING: Impact and abrasion UV and weather resistant traffic deck coating used for parking decks, roof decks, stadium bleachers, balconies and other areas requiring a durable coating system. 

VULKEM PRIMER 171: A one-part, film forming primer to be used on porous surfaces to improve adhesion and to reduce pinholes in the membrane. Also used in expansion joints subject to continuous immersion or subject to water intrusion from hydrostatic conditions. 

TREMPROOF 200EC: A two-part, low VOC water based epoxy primer for concrete surfaces.

 VULKEM PRIMER 191: A one-part interlaminary primer for use when applying a fresh coat of Vulkem urethane after the proceeding coat has been exposed for over 24 hours and/or has lost its surface tack. 

BACKER ROD: A closed cell polyurethane back up material used in expansion joints, to control the depth of the sealant. 

AGGREGATE: Silica sand or alumina oxide which imparts the non-slip texture and contributes to wear resistance. Note: Aggregate size needs to be determined by client. Refer to the project manager for your specific job requirements.  

6. Detail Work Note: Do not apply sealant or coatings to a frosty, damp or wet surface or when air temperature is falling or below 5oC or the surface temperature is above 40 oC . Cure times as stated below are based upon standard ambient conditions of 25oC, 50% relative humidty. A decrease in ambient temperature will significantly lengthen the cure time. In cold temperatures less than 10 oC  contact a local Tremco Representative.  

6.2 At horizontal and vertical surface junctures (such as: curbs, wall sections, columns or penetrations through deck) Apply a 10mm bead of Dymonic NT. Tool the sealant bead to form a 45 degree fillet. Use sufficient pressure to force out any entrapped air and to ensure complete wetting of the surface. Remove excess sealant from the deck or wall surface. 

6.3 Preparing expansion joints, install a Backer Rod, 3mm to 6mm diameter larger than the joint width to all prepared expansion joints. Set depth of Baker Rod to control the depth of the sealant. (Depth of sealant is measured from the top of the backer rod to the top of the concrete surface.) Proper depth of sealant is as follows: For joints 6mm to 12mm wide, the width to depth ratio should be equal. Joints 12mm wide or greater should have a sealant depth of 12mm. Minimum joint size is 6mm by 6mm. 

6.4 All cracks and joints shall be sealed with Dymonic NT Sealant, and tooled flush with the surface. 

6.5 Allow Dymonic NT Sealant to cure overnight. 

6.6 To provide a neat termination of the vertical detail coat, apply a strip of tape (masking tape or duct tape) to vertical sections, above the Dymonic NT Sealant fillet, prior to sealant application. 

6.7 Apply a 0.75mm thick detail coat of Vulkem 350-R, 150mm wide centered over all untreated cracks, all routed and sealed cracks and over all cold joints. Feather terminating edge of detail coat to prevent these edges from showing through the finished coating. 

6.8 Allow all detail coats to cure for 24 hours. NOTE: Expansion joints should not be coated over.  

7. Primer Application 

7.1 Using Tremproof 200EC remix each component separately with a mechanical mixer. 

7.2 Mix the two components together in equal parts by volume for a minimum of 5 minutes until homogeneaus.

7.3 Avoid trapping air in mixture as this can cause pin holing in the coating. 

7.4 On porous surfaces mixed material can be diluted with 10% water for the first coat only. 

7.5 Apply with brush or roller & work into surface to eliminate pin holing. 

7.6 Allow the 1st coat to cure for 4 hours at 25oC /50%RH. Apply a 2nd coat at 90 degree to the 1st coat. (Normally one coat required) 

7.7 Tremproof 200EC cure rates dramatically slow at temperatures below 10oC. At cold temperatures refer to individual data sheet or contact your local Tremco Representative.  

8. Coating applications - Basecoat 

8.1 Apply Vulkem 350, 1.2mm thick wet film to the entire area to be coated, including over all detail coats, but excluding expansion joints. The most popular method of application is with a notched squeegee . Backroll to evenly distribute coating and eliminate pinholes. Vulkem 350 can also be applied with a roller equipped with a solvent resistant, medium nap roller sleeve. Spray equipment should be a 45:1 ratio pump. Operate at 50 psi (345 Kpa) with a 70 cfm (30 L/sec) air supply. Use a .029 to .037 (.7-.9mm) tip with a Reverse-A-Clean nozzle. Material hose shall be 25mm by 30m maximum, with a 1.5m long whip hose at the gun. (Note: For squeegee or roller application in sloped areas, use Vulkem 350-R which has been formulated for vertical hold. When spraying Vulkem 350-R on sloped areas, it is necessary to apply multiple coats). Check thickness with wet film gauge. 

8.2 Allow Vulkem basecoat to cure for 24 hours. (See note at paragraph 7 with regard to time/and temperature cure times.) The Basecoat should be tested to assure a thorough cure prior to applying the topcoat. To test (a tacky condition is normal and desirable) use a pocket knife or razor, cut into the base coat to determine if the material beneath the surface is firm and cut clean. The Basecoat should have a slightly tacky surface to aid in the adhesion of the Vulkem 951NF. If the membrane coat has reached a tack-free cure, the surface must be cleaned with a cloth which has been wet with Xylol. DO NOT SATURATE THE SURFACE WITH SOLVENT. IF THE VULKEM MEMBRANE COAT HAS BEEN ALLOWED TO BE EXPOSED FOR A PROLONGED PERIOD, IT SHOULD BE CLEANED, THEN PRIME COATED WITH VULKEM PRIMER 191. CONTACT YOUR TREMCO REPRESENTATIVE  

9. Coating applications - Topcoat 

9.1 Mix Vulkem 345 topcoat using a jiffler type blade in an electric drill to assure there is no settlement in the bottom of the pail and the colour of the material is even and consistent with no streaks or striations. 

9.2 Apply the mixed Vulkem 345 with a medium nap solvent resistant roller sleeve at a rate of 5m2/ L. Take care to apply an even coat without puddles or thick roller edge lines. 

9.3 Broadcast the selected aggregate onto wet surface of the Vulkem 345 coat. Cover the entire surface leaving no wet spots. 

9.4 Allow the Vulkem 345 to cure overnight 

9.5 Sweep and vacuum off all loose, unbound aggregate. 

9.6 For ramps and high traffic turning areas repeat steps 9.1 to 9.5 

9.7 Mix Vulkem 346 topcoat using a jiffler type blade in an electric drill to assure there is no settlement in the bottom of the pail and the colour of the material is even and consistent with no streaks or striations. 

9.8 Apply Vulkem 346 with a medium nap solvent resistant roller sleeve at a rate of 5m2/L. Remove excess material from the roller by using a screen in the pail to avoid puddles on ponding of the material. 9.9 Allow the Vulkem 346 to cure for 24 hours for pedestrian areas, 48 hours for vehicular areas dependant of ambient curing conditions.  

10. Slip Resistance The non-slip properties of the finished deck coating system is determined by the application. Tremco suggest installing a test patch and obtaining customer acceptance prior to commencing project.  

11. Clean Up 

11.1 Clean all adjacent areas to remove any stains or spills with MEK, Toluene or Xylene. 

11.2 Clean tools or equipment with MEK, Toluene or Xylene before materials cure. 

11.3 Clean hands by soaking in hot, soapy water then brush with a stiff bristle brush or alternatively use Tremco Tub-O-Towels to clean hands. 

11.4 Tremproof 200EC can be cleaned with water before hardening.  

12. Usage The following is a guide to estimate material usage: DYMONIC NT: Approximately 6 lm/600ml sausage for a 10mm x 10m joint VULKEM 350 COATING: Application at a rate of 1.00m2/L will yield a thickness of 1.0mm wet VULKEM 345 TOPCOAT: Application at a rate of 2.0m2/L will yield a thickness of 0.3mm wet VULKEM 346 TOPCOAT: Application at a rate of 3.5 - 4.5m2/L will yield a thickness of 0.3mm wet TREMPROOF 200EC: Application rate of 5m2/ litre/coat. VULKEM PRIMER 171: Application rate of 8-10m2/litre for dense surfaces, 2-4m2/litre for porous surface. VULKEM PRIMER 191: Application rate of 30- 40m2/litre  


 

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