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Elasto-Deck™ Systems

Joint Sealant

ANSWERS TO THE MOST FREQUENTLY ASKED QUESTIONS
General Questions:
  1. How dry does the concrete have to be?
  2. How many days of dry weather do I need?
  3. What is the minimum recommend slope angle?
  4. How long does the concrete have to cure for?
  5. Do I really need a primer?
  6. Do I need to shot-blast the surface? Why?
  7. Why do I need to do both?
  8. Can I acid etch the concrete?
  9. Can I thin the materials?
  10. Can I mix different materials together?
  11. What equipment do I need to apply your materials?
  12. Can I add solvent to the material?
  13. Can I use someone else's caulk? Primer? Basecoat?
  14. What caused my deck to bubble or blister?
  15. What caused my coating to have pinholes?
  16. Can I apply 2 coats in the same day?
  17. Can I leave the base coat exposed for a few weeks before apply the next coat?
  18. How many years will it last?
Answers to the General Questions:
  1. Concrete should have less than 15% moisture. If moisture content is from around 7% to 15%, Elasto-Poxy™ Primer MUST be used.
  2. We recommend five days of dry weather to coat and cure, but with rainproof covering, work may be completed in wet weather, as long as the surface is completely dry before each coat.
  3. An average of 1/16” per ft (1/8" min. for wood).
  4. Concrete must be allowed to cure for a minimum of 28 days.
  5. Primers are not needed on new, clean exterior grade plywood. Otherwise, condition of the substrate and products used will dictate whether a primer is needed.
  6. Shotblasting will remove contaminants as well as provide a good profile. It is not always needed, however.
  7. Substrate conditions will again determine whether you need to both shotblast and prime.
  8. Acid etching is acceptable in many cases, if done properly and the surface is neutralized prior to coating.
  9. Thinning is not generally recommended as most materials are supplied in ready to use form. Thinners are only used when specifically suggested and approved by the manufacturer of the coating.
  10. Different materials must not be mixed together. Each is designed and manufactured to do a specific job as supplied.
  11. Products are applied in many cases by spray, brush, roller, trowel etc., depending upon viscosity, rates of application and so on.
  12. As in thinning, adding solvent is not usually required, or recommended.
  13. We do not recommend intermingling other brand materials with our systems.
  14. Bubbling or blistering may be caused by moisture in the substrate, high temperature of substrate, or air having been whipped into the material during the mixing operation.
  15. Pinholes can be caused by minute contaminations on the surface of the substrate as well as air in a concrete substrate.
  16. Many products require 24 hours between coats, however our ED-6500 can be re-coated in the same day.
  17. Our aromatic base coat (ED-5001) should not be left uncoated for more than a few weeks. The sooner it is top-coated after cure, the better.
  18. Latex lasts 3 to 5 years, while urethane lasts from 8 to 10 years.

What kind of plywood should I use for the deck?


Use 5/8" CDX tongue and groove minimum. If less than 3/4" CDX, then block it at all intersections. The slope must be 1/8" per ft. minimum. Plywood should be fastened with ring shank nails or exterior grade wood screws, in a size applicable to your situation. Plywood does not need to be primed. Note: OSB board IS NOT acceptable.

TOOLS
Hammer and ring shank nails, screw gun, and wood screws.

What kind of flashing should I use?


Use 24-gauge minimum. Bonderized or galvanized. Outside open perimeter flashing should be drip edge with a 1/4" kicker at the bottom. Inside perimeter should be diato flashing with a 2” leg on the deck. Use Z metal flashing under door or slider thresholds. All flashing needs to be fastened with 1” (min.) roofing nails, 4” OC and must be primed with Stainless Steel Primer. Flashing must be caulked (Elasto-thane 230) and taped where it meets the plywood. 

TOOLS
Caulking gun, hammer and 1” roofing nails.

What do I need to do for the joints?


Joints must be caulked (Elasto-thane 230) and taped with 4” wide seam tape.

How do you resurface plywood decks?


Remove all loose coatings, using an angle grinder, with either a wire cup or a sanding disc (16 grit is preferred). Coat all ground areas with Elasto-deck 5001. Clean the entire deck with dish soap, scrub as necessary and rinse thoroughly with clean water. After deck is dry, prime with Pacific Polymers Inter-coat Adhesion Primer, sand coat and topcoat as above.

How should I prep concrete decks?


Concrete must be fully cured (28 days), structurally sound, clean, and dry with a light broom finish. It should be water cured, (sodium silicate curing compound is acceptable) with a compressive strength of 3000 psi. Concrete should slope 1/16” to 1/8” per ft. Prepare concrete by acid etching, sand blasting, or shot blasting the surface to receive the new waterproofing system.

How do you fix cracks before coating?


Caulk (Elasto-thane 230) all cracks and 90’s at curb and wall intersections. Any crack larger then 1/16” needs to be routed out to 1/4" and caulked accordingly. Prime (Elasto-poxy Primer) all surfaces to be coated at a rate of 300 sq. ft. per gallon. On grade concrete is not an acceptable substrate for high build elastomers. Use epoxies or acrylics designed for on grade situations.

Do I need to vent pan-poured concrete decks?


All pan poured concrete decks MUST be vented, unvented pans are NOT acceptable. Venting the pan can be achieved by either purchasing them at the beginning or punching 1/4" holes every 12 inches along the lower flutes.

How do I prep concrete for a buried membrane?


The surface conditions for buried membranes are the same as a topside system. Elasto-deck BT can be rolled, brushed, squeegee, spray or notched trowel and back rolled applied. Elasto-deck BT should be applied at a rate between 45 to 60 sq.ft. per gallon giving one a thickness of 25 to 30 dry mils. Depending on the type of Elasto-deck BT used, 1, 2 or 3 coats should be applied, yielding 60 to 90 mils.

What is the best coating method?


Elastic-deck 5001 can be rolled, brushed, squeegee, spray or notched trowel and back rolled applied. For first time users, use a 1/16th" notched trowel, which will yield 25 dry mils. It should be applied at a rate between 45 to 60 sq.ft. per gallon giving one a thickness of 25 to 30 dry mils. Depending on the system, 1 or 2 coats should be applied.

Elasto-glaze 6001 AL can be roller, brush, squeegee or spray applied. It should be applied at a rate of 115 sq. ft. per gallon for sand coats and 100 sq. ft. for the topcoat.

Sand should be broadcast at a rate between 10 to 25 lbs. Per 100 sq.ft.

What is the best method of resurfacing concrete?


Remove all loose coatings, using an angle grinder, with either a wire cup or a sanding disc. Coat all ground areas with Elasto-deck 5001.
Clean the entire deck with dish soap, scrub as necessary and rinse thoroughly with clean water.
After deck is dry, prime with Pacific Polymers Inter-coat Adhesion Primer, sand coat and topcoat as above.

TOOLS
Roller frames and pads are typically 9”, but 12” and 18” rollers are common. Brushes, 3”or 4” are most common. Notched rubber squeegees range from 18” to 36”, but the most common are 24”.