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SS3 NN31H103HSINid'1VI01
COVERAGES
Coverage rates are approximate only and can
vary greatly due to surface conditions, humidity,
temperature and installation techniques.
PLYWOOD JOINTS
MK-2 Weather Deck Fine Cement & MK-30
Weather Deck Emulsion
150-200 LFT/40 lb. bag mix
CONCRETE JOINTS
MK-90 Mer-Ko Polyurethane Caulking
66-128 LFT/20.29 fl, oz sausage
(Based On 3Ae" Bead)
SLIP SHEET
MK-65 Weather Deck Slip Sheet
216 ft2/roll
SKIM COAT
MK-2 Weather Deck Fine Cement & MK-30
Weather Deck Emulsion
200 ft2/40 lb. bag mix (Yield 1/32")
MEMBRANE WITH FABRIC REINFORCEMENT
(FLASHING)
MK-25�k4er-Ko Membrane
50 ft2/ gallon (Yield 20 mil OFT)
MK-80 Mer-Ko Burlap (10-Roll) 300 LFT/roll
MEMBRANE WITH FABRIC REINFORCEMENT
(DECK)
MK-25 Mer-Ko Membrane
1st Application:
40-45 ft2/ gallon (Yield 15 mil DFT)
MK-75 Lath (38- Roll) 475 ft2/roll
2nd Application:
130-140 ft2/ gallon (Yield 5 mil DFT)
BODY COAT (*Total Coverage for Two Coats)
MK-1 Weather Deck Body Cement & MK-30
Weather Deck Emulsion
40-45 ft2/50 lb. bag mix (Yield Ye")
SMOOTHING COAT
MK-2 Weather Deck Fine Cement & MK-30
Weather Deck Emulsion
150-200 ft2/40 lb. bag mix (Yield 1/32" )
TOPCOAT PRIMER
MK-35 Mer-Ko Primer
350-400 ft2 / gallon
TOPCOAT (Two Coats)
MK-40 Mer-Ko Topcoat
300-350 ft2/ gallon
Additional topcoat material may be required
for textured or skid resistant finishes
INSTALLATION CONDITIONS
The Weather Deck system must not be Installed if the surface or ambient temperature is or will drop below
55°F or rise above 90°F within 24 hours or when precipitation is expected or occurring.
SUBSTRATE INSPECTION AND PREPARATION
The substrate surface must be clean, dry and free of dust and any other contaminants at the time of
material application. A minimum finished deck slope of '/,-per foot slope is required for proper drainage.
Use 26 gauge bonderized steel or equivalent flashing around the perimeter; clean and degrease all metal
flashings. Do not use copper perimeter flashings. Stainless steel requires scuffing with the use of 100-120
grit sand paper prior to cleaning.
PLYWOOD
Plywood must be minimum sh inch (3/4 inch preferred) exterior grade. Slope must be a minimum of Y4 inch
per linear foot and shall provide for proper drainage. Decks should meet local building codes. The deck
shall be tongue and groove, properly blocked and nailed (glued and screwed is best). Plywood shall have
a maximum joist span of 16 inches. OSB is not a suitable substrate for this material. Be sure the surface is
clean, dry and free of grease, paint, oil, dust or any foreign material that may prevent proper adhesion. Do
not apply to wet plywood.
CONCRETE
Concrete must be clean, dry and free of laitance, grease, paint, oil, dust, curing agents or any foreign
material that will prevent proper adhesion. The concrete should be at least 3000 psi, porous and able to
absorb water. A minimum of 28 days cured is required on all concrete. Before starting flooring work, test
existing concrete for moisture. If moisture emissions exceed 3lbs./1000 sq ft. or 75%RH, contact the
manufacturer before application. Concrete shall be prepared by water blasting, grinding or shot blasting
as required to produce a clean, sound substrate, equal to a minimum CSP 2-3 per ICRI.
APPLICATION INSTRUCTIONS
In each step ofthe application, always be sure that the previous coat has fully dried before applying the
next coat. Read all instructions before starting application.
FLASHING
Install a minimum 26 gauge, bonderized, 4"x 6"'wall-to -deck flashing where the deck meets the wall.
Place the 6-inch side up the vertical wall and minimum 4"x 2-fascia flashing on deck edge with the 4-
side placed on the deck. Nail in a staggered pattern every 4to 6 inches. Be sure to caulk all flashings
seams and overlaps using MK-90 Polyurethane Caulking.
WALL VENTS
Wall vents help alleviate vapor transmission pressure that can build up underneath the waterproofing
membrane of the waterproof deck system. It is recommended that wall vents be installed in the flashing,
on all decks that are larger than 500 ft2 or approximately one vent for every 300 ft2. Wall vents are
available from Thunderbird Products (www.thunderbirdproducts.com).
PLYWOOD
Fill all plywood seams with MK-2 Weather Deck Fine Cement. Combine 1.75 to 2 gallons of MK-30
Weather Deck Emulsion and up to 1 quart of water with one 40 lb. bag of MK-2 Weather Deck Fine
Cement. Blend with a mechanical mixer until an even consistency is achieved. Fill plywood seams and
strike flush prior to drying. Amason's grout bag may be used to expedite this process. After material has
dried remove surface imperfections by lightly scraping or sanding. Be sure to remove all debris prior to
commencing with the next step.
CONCRETE
All holes shall be cleaned and filled with MK-90 Mer-Ko Polyurethane Caulking or an appropriate Mer-Ko
Underlayment. All high spots shall be removed by chipping or grinding. Concrete control joints shall
meet local building codes and comply with industry standards.
SLIP SHEET
Apply MK-65 Weather Deck Slip Sheet over the entire deck with a 2 inch distancefrom all vertical
surfaces, parapets, drain openings, etc. The slip sheet edges shall overlap a minimum of 2 inches and end
of roll terminations shall be staggered. A Y4 inch bead of MK-95 Slip Sheet Adhesive shall be used to bond
slip sheet overlaps, the slip sheet tothe deck perimeter and the slip sheet at intermediate locations to
limit the non -bonded area to a maximum of 4000 ft2. All seams should be rolled with a weighted roller to
ensure the slip sheet is flat and even. A minimum 24 hours drying time at 70'F, 50 percent relative
humidity shall be observed before continuing with the installation of the primer coat.
mer-ko.com
844-537-7203
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Weather Deck System Specification 4/2020
Page 2 of 5
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PHYSICAL CHARACTERISTICS
Abrasion Resistance
(ASTM 04060, C-17 Wheel, 1,000 gram load for
1,000 cycles)
0.375 mg loss
Adhesion (ASTM C794)
> 755 psi
Compressive Strength (ASTM C109)
3,500 psi
Elongation (ASTM D638)
0.04 ft./ft.
Fire Rating
One -Hour (ASTM E-119)
Class A Fire -Retardant Rated (ASTM E-108)
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Ozone Resistance
No visual adverse effects after 30 days exposure
Resistance to Aging (ASTM G23, AC 39)
2,000 hours No visual signs of failure
APPLICATION INSTRUCTIONS - ON STAIRS
SUBSTRATE PREPARATION
After the initial substrate preparation, nail all metal (lashings 3 inches on center with staggered spacing
using galvanized roofing nails. Install appropriate aluminum stair nosing on all treads using screw nails or
galvanized deck screws. Install according to stair nosing manufacturer's recommendation. Protect the bull
nose/ finished portion of the stair nosing during application of the Weather Deck system. The MK-65
Weather Deck Slip Sheet is not used on stairs, a direct bond to the substrate occurs.
SKIM COAT FLASHING, VERTICAL AND HORIZONTAL SURFACES
Apply the Skim Coat to all stairs. Follow the same instructions per section "Skim Coat".
MER-KO MEMBRANE WITH FABRIC REINFORCEMENT
Install MK-80 Mer-Ko Burlap to all stairs. Follow the same instructions per section "Mer-Ko Membrane
with Fabric Reinforcement"
BODY COAT
Apply the Body Coat to all stairs. Follow the same instructions per section "Body Coat': Use a torpedo
level to check every step for proper pitch.
SMOOTHING COAT
Apply the Smoothing Coat to all stairs. Follow the same instructions per section "Smoothing Coat'.'
TOPCOAT PRIMER
Apply the MK-35 Mer-Ko Primer to all stairs. Follow the same instructions per section "Topcoat Primer".
TOPCOAT
Apply the MK-40 Topcoat to all stairs. Follow the same instructions per section "Topcoat':
CAUTIONS & LIMITATIONS
,Mer-Ko waterproof deck systems are designed for professional installation.
-System warranties require installation by currently listed applicators.
-In freezing climates, sufficient pitch is required to ensure run-off.
-When covering a "sandwich slab" provision must be made to vent the area created between the existing
vapor barrier and the Weather Deck.
-When installing a deck system over an unheated enclosed space (e.g., garage, etc.) provisions must be
made to vent the area.
-Drains must be of a design suitable to receive Weather Deck system.
Concrete substrates must have a minimum compressive strength of 3000 psi tested by "point loading"
technique.
-Weather Deck provides moderate chemical resistance. Avoid exposure to harsh chemicals or acids.
-Heavy objects can affect movement of the slip sheet decking system and result in hairline cracks at the
surface of the system. Avoid placing heavy objects on or dragging them across the Weather Deck surface.
•Cementitious materials should be used within 30 minutes, do not re -temper.
-The substrate must be flat. Irregularities, if not corrected, will reflect on the Weather Deck surface.
-Compositions of oxychloride cement, epoxies, urethanes, PVC's, PVA's, silicones, solvent thinned
elastomer solutions or combinations thereof will not be considered acceptable under this specification.
.Always apply Mer-Ko Primer after the smoothing coat and between any system layers that have cured for
more than 72 hours.
-The Waterproofing Membrane should not be exposed for more than 72 hours prior to being covered with
the MK-1 Weather Deck Body Cement.
-Do not leave any layer unprotected for more than 30 days prior to completing the full system installation,
including the final topcoat application.
-Not designed for vehicular or heavy steel wheeled traffic.
-Protect all finished surfaces that are not intended to receive the deck coating system materials.
-Rain will wash away uncured Mar-Ko acrylic products.
-If inclement weather threatens, cover deck to protect new application.
-Sealers will make the surface slippery. Please be aware of the texture of the surface and how the sealer
will affect the look, feel and skid resistance.
Approval and verification of proposed colors, textures and slip resistance is recommended.
mer-ko.com
844-537-7203
Weather Deck System Specification g/ e4 of 5
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