ARDEX 8+9™

ARDEX Americas

400 Ardex Park Drive

Aliquippa, PA 15001 USA

724-203-5000

888-512-7339

www.ardexamericas.com

AMERICAS

ARDEX 8+9

™

Rapid Waterproofing and Crack

Isolation Compound

Rapid setting - tile in as little as 90 minutes

Flood test in 4 hours

Crack isolation up to 1/8” (3 mm)

Excellent coverage - up to 300 sq. ft. for commercial unit

and up to 100 sq. ft. for convenient kit

Available in Gray or White

Ideal for applications in commercial and residential bathrooms,

showers and kitchens prior to the installation of tile and stone

For use in swimming pools*

Use for interior or exterior floors and walls

Easy to apply with a roller or paint brush

A solvent-free blend of Portland cement and other hydraulic cements

for the ultimate bond with ARDEX tile and stone mortars

Helps to prevent efflorescence from the substrate

Can be used in place of a shower pan liner

Use for shower pan in conjunction with ARDEX A 38 MIX

™

ARDEX A 38

™

for fast-track applications

Zero water penetration via wind-driven rain

Protects installation, including wire lathe, metal fasteners and

wooden substrates

Breathable makeup allows for more vapor pressure compensation;

less risk of condensation within the building envelope

ARDEX 8+9

™

Rapid Waterproofing and Crack Isolation Compound

Description and Usage

ARDEX 8+9

™

Rapid Waterproofing and Crack Isolation

Compound is a best-in-class, two-component, solvent-free,

cement-based membrane. Comprised of an acrylic-based

liquid compound and a Portland and other hydraulic

cement-based powder, ARDEX 8+9 can be applied easily

with a paint roller or a brush to produce a highly flexible,

waterproof coating. This coating protects from topside

water infiltration and provides an excellent bonding layer

for ARDEX tile and stone mortars. When properly installed,

ARDEX 8+9 reduces the risk of efflorescence and is IAPMO

certified for use as a shower pan.

ARDEX 8+9 can be used for topside waterproofing of all

common building substrates including showers, balconies

and other wet areas. On interior applications, ARDEX 8+9

can be used over concrete and masonry finishes, existing

tile, drywall, cementitious backer boards and plywood on

all interior floors or walls prior to the installation of tile and

stone.

Contact the ARDEX Technical Service Department

for guidance on exterior applications. ARDEX 8+9 also is

ideal for crack isolation up to 1/8” (3 mm) when used with

ARDEX SK MESH

™

Reinforcement Fabric for Waterproofing

and Crack Isolation; 1/16” (1.5 mm) when used alone.

Substrate Preparation

All substrates must be structurally sound, solid, dry,

thoroughly clean and free of oil, wax, grease, asphalt,

latex and gypsum compounds, curing compounds**,

sealers and any contaminant that might act as a bond

breaker. Plywood substrates must be APA-rated, Type 1

exterior-grade plywood. Refer to ANSI A108 AN-2 “General

Requirements for Subsurfaces,” the Tile Council of North

America’s “Handbook for Ceramic Tile Installation” and

TTMAC for detailed information on surface preparation

and guidelines for substrate construction. The plane of

wall surfaces must be plumb and true. Floor surfaces

must have minimal variation in the plane or slope, and

sloped areas must have proper slope towards the

drain(s).Should interior pre-leveling or substrate

repair be required, use:

Product Interior Exterior Vertical Horizontal

ARDEX AM 100

™

Rapid

Set Pre-Tile Smoothing

and Ramping Mortar

(only on cementitious

substrates)

X X X X

ARDEX A 38

™

Rapid Set

Screed

X X X

ARDEX A 38 MIX

™

Rapid

Set, Premixed Screed

X X X

ARDEX Liquid

BackerBoard

Self-

Leveling Underlayment

(for wood and concrete

subfloors)

X X

ARDEX TL 1000

™

Tile

Leveler, Self-Leveling

Underlayment

X X

ARDEX TL PATCH

Tile

Leveler, Underlayment

Patch and Skimcoat

X X X

Expansion joints must be provided over existing moving

joints, and where substrate materials change composition

or direction, per ANSI A108 AN-3.7 and TTMAC guidelines.

**Note on Curing Compounds

Test areas of ARDEX 8+9 can be installed and evaluated

over concrete slabs that have been treated with either

silicate or acrylic resin curing compounds. These

compounds must be installed in strict accordance with

the compound manufacturer’s written recommendations.

If a silicate type has been used, all residual salts must

be removed.

Please be advised, however, that there are a number

of curing compounds sold today that are wax- or

petroleum-based emulsions. These are permanent bond

breakers that must be removed completely prior to

patching or leveling. Dissipating compounds must also

be removed completely by mechanical means prior to

installing any ARDEX material.

It is imperative to be able to determine the type of curing

compound that was used before proceeding. Any curing

compound that cannot be identified should be completely,

mechanically removed.

Recommended Tools and Accessories

ARDEX M-6W Mixing Bucket***, ARDEX T-2 Ring Mixing

Paddle, ARDEX SK MESH, ARDEX SK DRAIN

™

Mesh

Reinforcement Fabric for Drain Tie-Ins, 3/16” x 3/16”

V-Notch Trowel, high speed drill, margin trowel, putty

knife, 3/8” nap paint roller and paintbrush

***When mixing commercial-sized units of ARDEX 8+9,

a minimum 6-gallon capacity is needed. ARDEX

recommends the ARDEX M-6W Mixing Bucket for

this purpose.

Mixing and Application

ARDEX 8+9 can be mixed to two different consistencies

– caulking or paintable. Using the mix ratios below, pour

the ARDEX 8 liquid into the mixing bucket first, and then

add the ARDEX 9. Do not add water or additives! For

best results, mix with an ARDEX T-2 Ring Mixing Paddle

and a high speed drill for 2 - 3 minutes. Just prior to

application on the substrate, the mixture should be stirred

again to ensure a creamy, smooth, lump-free consistency.

Caulking Consistency

• For one 9 lb. (4 kg) bag of ARDEX 9,

use approximately 2/3 of the 1 gallon unit

(approximately 2/3 gallon / 2.5 L) of ARDEX 8.

• For one 27 lb. (12 kg) bag of ARDEX 9, use

approximately 2/3 of the 3 gallon unit

(approximately 2 gallons / 7.56 L) of ARDEX 8.

• To mix small batches of the caulking consistency, mix

one 2/3 part of ARDEX 8 with one part of ARDEX 9

powder by volume.

Tile Installation and Flood Testing

Tile can be installed over ARDEX 8+9 once the final coat

has dried (approximately 1 hour, depending on ambient

conditions). If flood testing is required, please note that

the final coat of ARDEX 8+9 must first cure for a

minimum of 4 hours.

Crack Isolation

ARDEX 8+9 can be used as a crack isolation membrane

in accordance to ANSI A118.12. ARDEX 8+9 will isolate

minor, in plane substrate cracking up to 1/16” (1.5 mm)

when used without mesh and up to 1/8” (3 mm) when

used with mesh.

If ARDEX SK MESH is to be used for crack isolation over

a large, cracked area, first apply a layer of ARDEX 8+9

to the substrate using a 3/16” x 3/16” V-Notch trowel.

Special care should be taken to ensure no wrinkles are

left in the installed mesh.

Crack Bridging

ARDEX 8+9 can be used to bridge existing dormant,

non-structural cracks up to 1/8” (3 mm) wide with no

vertical displacement. ARDEX SK MESH, alkali resistant

tape or similar material must be placed over the crack.

ANSI Test Results A118.10 (Waterproofing)

and A118.2 (Crack Isolation)

Use this consistency to fill around floor or wall

penetrations, for corner and floor/wall joints and around

pipes. The unused portion of the trowel grade mixture

can be blended back with the balance of the liquid

ARDEX 8 and used in the paintable consistency. Follow by

applying ARDEX SK MESH, alkali resistant tape or similar

material over the corner or penetration using the paintable

consistency of ARDEX 8+9, and then smooth over the area

with a putty knife.

Paintable Consistency

• For one 9 lb. (4 kg) bag of ARDEX 9, use an entire

1 gallon (3.78 L) unit of ARDEX 8.

• For one 27 lb. (12 kg) bag of ARDEX 9, use the entire

3 gallon (11.34 L) unit of ARDEX 8.

To mix small batches of the paintable consistency, mix

one part of ARDEX 8 with one part of ARDEX 9 by volume.

Apply the first coat of the paintable mixture to the surface

with a paint roller. Use a paintbrush to coat reinforced

corners, edges and around drains. Coat the entire area

and allow thorough drying (30 - 45 minutes). A second

layer is required to obtain a waterproof and/or crack

isolation membrane, and must be applied at a 90°

angle to the first coat. Total thickness should be 1/32”

(0.79 mm) minimum. Allow the final layer to dry thoroughly

(approximately 1 hour at 70°F/21°C) prior to installing the

tile using ARDEX setting materials. Once the final coat is

dry to the touch, cover ARDEX 8+9 with mortar within

24 hours to avoid dust contamination. If dust contamination

occurs, clean with a damp ARDEX sponge before

applying mortar.

Mesh Reinforcement for Drains

and Changes of Plane

For drain tie-ins, corners, changes in plane and individual

cracks or saw cuts use standard width 4 7/8” (120 mm)

ARDEX SK MESH, alkali resistant tape or similar material.

For corners, changes in plane and individual cracks or

saw cuts, begin the installation by applying the referenced

items with ARDEX 8+9 mixed to a paintable consistency.

Without allowing the ARDEX 8+9 to dry, lay the fabric into

the fresh ARDEX 8+9 and key it in with the smooth side

of a clean trowel or the elbow of a roller. Immediately

proceed to install 2 coats of paintable consistency

ARDEX 8+9 over the whole surface to be waterproofed.

For drain tie-ins, apply the paintable consistency mixture

of ARDEX 8+9 around the edges of a drain using a

paintbrush. Lay the ARDEX SK DRAIN or similar drain mesh

in the fresh ARDEX 8+9 and key it in with the flat side of

a trowel. Immediately proceed with two coats of paintable

consistency ARDEX 8+9 over the drain mesh and the entire

surface to receive waterproofing. NOTE: When installing

ARDEX 8+9 with mesh, special care should be taken to

ensure no wrinkles are left in the installed mesh.

Property Test Method ANSI Specification Test Results

Fungus Resistance A118.10 Section 4.1 No Growth Pass

Seam Strength A118.10 Section 4.2 > 8 lbs. / inch width 48 lbs. / inch width

Breaking Strength A118.10 Section 4.3 > 170 psi (12 kg/cm

) 865 psi (61 kg/cm

)

Dimensional Stability A118.10 Section 4.4 +/- 0.7% 0.00%

Waterproofness A118.10 Section 4.5 No Water Penetration Pass

Shear Bond Strength to Cement Mortar

Shear Strength After

Water Immersion

(7 day)

A118.10 Section 5.4 > 50 psi (5 kg/cm

) 90 psi (6 kg/cm

)

Four Week Shear

Strength

A118.10 Section 5.5 > 50 psi (5 kg/cm

) 132 psi (9 kg/cm

)

System Crack Resistance

Standard

Performance

(without mesh)

A118.12 Section 5.4 > 1/16" and < 1/8" Pass

High Performance

(with mesh)

A118.12 Section 5.4 > 1/8" Pass

Point Load A118.12 Section 5.2 > 1000 lbs. > 3,300 psi (232

kg/cm

)

Robinson Test A118.12 Section 5.3 As Specified Extra Heavy

ARDEX Americas

400 Ardex Park Drive

Aliquippa, PA 15001 USA

724-203-5000

888-512-7339

www.ardexamericas.com

Notes

FOR PROFESSIONAL USE ONLY.

All tools should be cleaned with water immediately

after use. ARDEX 8+9 is not recommended for roofing

applications or as exterior primary waterproofing over

indoor spaces.

As always, ARDEX recommends the installation of test

areas to confirm the suitability of the product for the

intended use.

Never mix with cement or additives other than ARDEX

approved products. Observe the basic rules of tile work.

Do not install below 50°F (10°C) surface temperature.

*For submerged applications, please contact the

ARDEX Technical Service Department.

ARDEX 8+9 can also be used to adhere ARDEX DS 70

™

Acoustic Mat installations. For more information, please

refer to the appropriate technical data sheets.

Store at temperatures between 40 and 90°F (5 - 32°C).

Do not freeze. Do not reuse container. Dispose of

packaging and residue in accordance with federal,

state and local waste disposal regulations. Do not

flush material down drains.

Precautions

Carefully read and follow all precautions and warnings

on the product label. For complete safety information,

please refer to the Safety Data Sheet (SDS) available

at www.ardexamericas.com.

Technical Data According,

To ARDEX Quality Standards

All data based on a mixing ratio of 1 unit of ARDEX 8 to

1 unit of ARDEX 9 at 70°F (21°C). Physical properties are

typical values and not specifications.

Mixing Ratio

Paintable Consistency: 1 gallon (3.78 L) of ARDEX 8 per

9 lb. (4 kg) of ARDEX 9 For small

batches, 1 part ARDEX 8 to 1

part ARDEX 9 by volume

Mixing Ratio

Caulking Consistency: 2/3 gallon (2.5 L) of ARDEX 8

per 9 lb. (4 kg) of ARDEX 9 For

small batches, 2/3 part ARDEX 8

to 1 part ARDEX 9 by volume

Coverage: 100 sq. ft. (2 coats) over drywall

Approx. 70 sq. ft. (2 coats)

over concrete

Pot Life: Up to 45 minutes

Drying Time: 30 - 45 minutes for initial coat

Approx. 60 minutes for final coat

Flood Test: Begin 4 hours after the second

coat has been applied

Colors Available : Gray and White

VOC: 0

Sizes Available: Convenient Kit: ARDEX 8 (liquid):

1 gallon (3.78 liters) bottle and

ARDEX 9 (powder): 9 lb. (4 kg) bag

Commercial Size: ARDEX 8 (liquid):

3 gallon (11.34 liters) bottle

and ARDEX 9 (powder): 27lb.

(12 kg) bag

Storage: Store in a cool, dry area. Do not

expose packages to sun. Keep

liquid from freezing.

Shelf Life: 1 year

Warranty: ARDEX L.P. Standard Limited

Warranty applies. Also eligible for

the ARDEX SystemOne

™

25-Year

Limited Warranty when used in

conjunction with select ARDEX

mortars and grouts.

Made in the USA.

Content updated 2021-1-6. Published 2021-03-29.

Supersedes all previous versions. Check

www.ardexamericas.com for most recent version

and for technical updates, which may supersede

the information herein.

AT114E

For easy-to-use ARDEX Product Calculators and Product Information

On the Go, download the ARDEX App at the iTunes Store or Google Play.

Visit www.youtube.com/ARDEX101 to watch

ARDEX 8+9 product demonstration video.

IMPORTANT TECHNICAL UPDATES

Technical update effective June 28, 2018:

ARDEX Tile Mortar Thicknesses over Membranes

CLICK HERECLICK HERE