ACT Membranes (Waterproofing & Crack-Isolation)

Which membrane category is typically applied with a notched trowel and roller, then allowed to cure to form a continuous seamless film?

• ASheet membrane
• BBonded-sheet membrane
• CLiquid-applied membrane
• DPolyethylene moisture barrier

A bonded-sheet membrane is adhered to the substrate using which material?

• AHot asphalt
• BANSI A118-compliant thinset mortar
• CConstruction adhesive
• DPeel-and-stick adhesive backing

Which of the following is an advantage of liquid-applied membranes over sheet membranes?

• AImmediate water-tightness without curing time
• BEasier to install around complex geometries and penetrations
• CAlways thinner than sheet membranes
• DDo not require any reinforcing fabric

Which membrane category provides waterproofing protection in the form of a pre-manufactured fabric that is laminated to polyethylene?

• ALiquid-applied acrylic membrane
• BBonded fabric-laminated sheet membrane
• CSingle-component urethane
• DHot-mopped asphalt

A 'fabric-reinforced' liquid-applied membrane uses reinforcing fabric primarily to:

• AAdd color to the membrane
• BIncrease elongation, bridge cracks at seams, and reinforce changes of plane
• CReplace the need for a primer
• DSpeed cure time

Which application method is correct for most liquid-applied waterproofing membranes?

• AOne thick coat applied with a notched trowel
• BMultiple coats with each coat fully cured before the next is applied
• CA single spray application of unlimited thickness
• DRoll application directly over dust without primer

Thinset-applied sheet membranes differ from trowel-on liquid membranes in that:

• AThey require no substrate preparation
• BThey are installed by burnishing them into a thinset bond coat with a float or roller
• CThey cure faster than concrete
• DThey are always thicker than 1 inch

Which membrane is most often used in steam showers where vapor pressure is a primary concern?

• AStandard A118.12 crack-isolation membrane
• BA118.10 waterproof membrane with a low perm rating (vapor retarder) and manufacturer stea…
• CAny liquid acrylic regardless of perm rating
• DPolyethylene sheeting behind cement board

Two-part urethane waterproofing membranes typically:

• ACure by water evaporation
• BCure by chemical reaction of resin and hardener
• CCure only when exposed to UV light
• DDo not require mixing

Which is NOT a valid type of membrane recognized by ANSI/TCNA for thin-set tile installation?

• ALiquid-applied waterproof
• BBonded-sheet waterproof
• CCrack-isolation membrane
• DLatex paint floor coating

A 'self-adhered' sheet membrane bonds to the substrate primarily through:

• AA pre-applied pressure-sensitive adhesive backing
• BHot welding
• CThinset only
• DMechanical fasteners only

Compared to sheet membranes, liquid-applied membranes are MORE likely to suffer which installation defect?

• AInconsistent film thickness (thin spots, pinholes)
• BSeam tape failure
• CRoll mis-alignment
• DWrinkled overlaps

When pre-formed corners (inside/outside) are used with a liquid-applied membrane system, they are typically:

• AOptional decorative items
• BBonded into the wet first coat of membrane and then over-coated
• CInstalled only after the final coat cures
• DStapled in place

Which membrane type is dimensionally stable and not subject to film-thickness variation by the installer?

• ALiquid-applied acrylic
• BPre-manufactured sheet membrane
• CSingle-component urethane
• DTwo-component epoxy coating

Which one of these systems is BOTH waterproof and crack-isolating when listed as such by the manufacturer?

• AAn A118.10-only listed liquid membrane
• BAn A118.12-only listed membrane
• CA 'multi-purpose' membrane listed to BOTH A118.10 and A118.12
• DA vapor retarder without ANSI listing

A liquid-applied membrane's required wet film thickness (WFT) is specified to ensure:

• AThe product cures faster
• BThe cured membrane reaches the dry film thickness (DFT) certified to ANSI A118.10
• CIt can be tinted any color
• DIt bonds to any substrate without primer

ANSI A118.10 is the American National Standard for which membrane category?

• ACrack-isolation membranes
• BLoad-bearing, bonded, waterproof membranes for thin-set tile
• CSound-isolation membranes
• DUncoupling membranes

The ANSI A118.10 hydrostatic water-pressure test uses a water column of approximately what depth?

• A1 inch
• B3 inches
• C6 inches (150 mm)
• D12 inches

Which property is evaluated by load cycling in ANSI A118.10 testing?

• AAbility of the bonded tile/membrane system to resist repeated mechanical loads without fa…
• BColor fastness in sunlight
• CDrying time at low humidity
• DSmoke development rating

Shear-bond strength testing in ANSI A118.10 measures bond between:

• ATile and grout
• BMembrane and substrate, and membrane and tile bond coat
• CConcrete and rebar
• DDrywall and paint

ANSI A118.10 also evaluates resistance to which biological factor?

• ATermites
• BFungus and microorganism growth
• CBird droppings
• DPollen

If a manufacturer claims A118.10 compliance, the installer should be able to verify this through:

• AThe product's color
• BIndependent third-party test reports and the published technical data sheet
• CPricing of the product
• DMarketing brochures only

Why does ANSI A118.10 use 'load-bearing' in its title?

• ABecause the membrane bears the weight of the tile but cannot be walked on
• BBecause the membrane is designed to remain bonded under the structural loads transmitted…
• CBecause the membrane carries dead loads of the building
• DBecause it only applies to floors, not walls

A membrane's elongation properties under A118.10 testing relate primarily to:

• AColor matching to grout
• BIts ability to stretch without rupture, supporting flexibility over minor substrate movem…
• CHow fast it dries
• DIts sound-deadening properties

Which ASTM standard does ANSI A118.10 reference for hydrostatic pressure testing?

• AASTM C109
• BASTM D4068 Annex A2 (modified)
• CASTM C627
• DASTM E84

Which ASTM standard is referenced by ANSI A118.10 for load-cycling tile floor performance?

• AASTM C627 (Robinson Floor Test)
• BASTM D5957
• CASTM E96
• DASTM C920

An A118.10-listed membrane in a residential shower must still be installed:

• AWithout regard to the manufacturer's instructions
• BPer the manufacturer's published written installation instructions and applicable TCNA me…
• CUsing only generic thinsets the installer prefers
• DOn wet concrete to improve bond

ANSI A118.10 testing requires the membrane to demonstrate water-tightness for what minimum time at the prescribed water column?

• A1 hour
• B12 hours
• C48 hours (per the modified ASTM D4068 Annex A2 protocol)
• D30 days

Which condition does ANSI A118.10 NOT independently certify?

• AHydrostatic water resistance
• BShear-bond strength
• CCrack-bridging at 1/8-inch (high performance crack-isolation)
• DFungus resistance

When a manufacturer states 'A118.10 compliant when applied at 30 mils DFT,' the installer must:

• AUse any film thickness desired
• BAchieve the specified dry film thickness using the appropriate wet film thickness
• CApply only 10 mils to save time
• DSkip primer to allow thicker buildup

Which document lists ANSI A118.10 alongside its companion installation and adhesive standards?

• AASHRAE 90.1
• BANSI A108/A118/A136.1 (consolidated tile installation standards)
• COSHA 29 CFR 1926
• DNFPA 70

ANSI A118.12 establishes performance criteria for which membrane type?

• AWaterproof membranes only
• BCrack-isolation membranes for thin-set ceramic tile and dimension stone installations
• CRoof underlayments
• DVapor retarders behind drywall

Standard-performance crack-isolation under ANSI A118.12 bridges horizontal cracks up to what width?

• A1/32 inch (0.8 mm)
• B1/16 inch (1.5 mm)
• C1/8 inch (3 mm)
• D1/4 inch (6 mm)

High-performance crack-isolation under ANSI A118.12 bridges horizontal cracks up to what width?

• A1/32 inch (0.8 mm)
• B1/16 inch (1.5 mm)
• C1/8 inch (3 mm)
• D1/2 inch (12.7 mm)

A crack-isolation membrane is designed to isolate ONLY which kind of substrate movement?

• AVertical (heaving) movement
• BHorizontal in-plane shrinkage cracks
• CSettlement greater than 1 inch
• DStructural collapse

Is the industry term 'anti-fracture membrane' formally recognized as a product category by ANSI?

• AYes, A118.11
• BNo — the recognized category is 'crack-isolation' under A118.12
• CYes, A118.10
• DYes, A136.1

Which test parameter is unique to ANSI A118.12 compared to A118.10?

• ACrack-bridging at specified width without transmission to a bonded tile
• BShear-bond strength
• CFungus resistance
• DCompressive strength

When tile is being installed over an existing slab with hairline shrinkage cracks (under 1/16 inch), the recommended approach is:

• ASkip any membrane and install thinset directly
• BUse a crack-isolation membrane meeting ANSI A118.12 (standard or high performance)
• CPour a new 2-inch slab on top
• DCover cracks with paint only

Crack-isolation membranes do NOT isolate which condition?

• AHorizontal shrinkage cracks
• BConstruction joints, expansion joints, isolation joints, or cold joints
• CMap cracking in cured concrete
• DSurface hairline cracks

A crack-isolation membrane is generally NOT a vapor barrier or waterproofing unless:

• AThe contractor wraps it in plastic
• BThe product is also listed to ANSI A118.10
• CIt is painted with sealant
• DIt is installed twice

ANSI A118.12 requires test performance evaluation for which two characteristics?

• ACrack-bridging and shear-bond strength
• BColor and odor
• CWeight and price
• DRoll length and packaging

For a large-format porcelain tile installation over a slab with random hairline cracks at 3/32 inch wide, the membrane choice should be:

• AStandard-performance A118.12 (1/16-inch bridging)
• BHigh-performance A118.12 (1/8-inch bridging)
• CNo membrane at all
• DA vapor retarder behind cement board

Even with crack-isolation membrane in place, the TCNA Handbook still requires the installer to:

• AIgnore movement joints
• BHonor movement joints per TCNA EJ171 (perimeter, interior field, transitions)
• CSkip soft joints
• DCaulk grout joints only

An A118.12 membrane is installed on a substrate that fails to meet flatness tolerances. The expected result is:

• AImproved bond
• BHollow spots, lippage, and increased risk of bond failure
• CFaster cure time
• DStronger crack-bridging

An A118.12-listed product must also meet which broader installation reference?

• AThe applicable TCNA Handbook method (e.g., F125 over crack-isolation)
• BRoof shingle manufacturer instructions
• COSHA fall protection
• DFCC wireless code

Before applying ANY membrane, the substrate must be:

• AWet, dirty, and oily
• BClean, sound, free of contaminants, structurally adequate, and properly prepared per the…
• CPainted with latex
• DSealed with floor wax

Static cracks in concrete substrate up to the membrane's bridging capacity should be:

• AIgnored
• BCleaned and filled or repaired per manufacturer directions before membrane is applied
• CCaulked with silicone only
• DPainted over