Tile adhesives bond ceramic, porcelain and stone tile to floors and walls, and the tile installation system around them adds 9 product classes in 3 groups: adhesives and mortars, grouts, and membranes under tile. Which adhesive a tile needs depends on the tile, the substrate and the water and movement it will see, so how do the classes differ?
US tile setters say "thinset" for cement-based adhesive and "mastic" for ready-mixed organic adhesive, while European, Australian and Indian specifications say "tile adhesive", and British sites still hear the colloquial "tile cement". This page covers adhesives, grouts and membranes for ceramic, porcelain and stone tile only, not glues for vinyl, resilient or peel-and-stick floor coverings. Tile setting materials are one of the 15 families of construction chemicals.
Europe classes cement tile adhesives by tensile adhesion under EN 12004, where C2 means at least 1 N/mm² (145 psi), and the US classes them by shear bond under ANSI A118, where A118.4-2023 requires more than 1.38 MPa (200 psi) on porcelain; the two results never convert. Thinset needs at least 80 % mortar contact in dry interiors and 95 % in wet areas, and the South Coast air district caps tile adhesive and grout at 65 g/L (0.54 lb/gal).
Standards, codes and regulations are checked against their issuing bodies, product values against the named data sheet and prices against the dated source named in the sentence; see our methodology and fact-checking.
What Is Tile Adhesive?#
A tile adhesive is a factory-made bonding material, cement-based powder, ready-mixed dispersion or two-part resin, that bonds tile to its substrate in a bed a few millimeters thick. For adhesives without an H rating, that bed measures 2.38 to 6 mm (3/32 to 1/4 in) after the tile is embedded.
Tile adhesives come in 4 forms. One-component powders, such as standard thinset, are mixed with water; two-component powders are mixed with a liquid latex additive; one-component dispersions, such as mastic, come ready to use; and two-component reaction resins, such as epoxy or polyurethane adhesives, are mixed from resin and hardener on site.
Thinset, tile adhesive and mastic: regional names for one product family#
Thinset, thin-set and dry-set mortar are the US names for cement-based tile adhesive, and mastic is the US name for a ready-mixed organic adhesive that EN and ISO call a dispersion adhesive. So what is the difference between thinset and tile adhesive? None: both names describe the same cementitious class, type C under EN 12004 and ISO 13007-1, and "modified dry-set mortar" in the US is the polymer-modified version of it. "Flexible tile adhesive" is the UK and European name for a cement adhesive with a deformability class.
How Do Tile Adhesives Bond Tile?#
Tile adhesives bond in 3 ways: thinset hardens by cement hydration and, in modified grades, polymer film formation; mastic dries as its polymer dispersion loses water; and reaction-resin adhesives cure by a chemical reaction between resin and hardener.
Cement hydration and polymer film in thinset#
Thinset bonds by mechanical keying of hydrated cement into the substrate and, in polymer-modified grades, by polymer adhesion to low-absorption tile. A thinset is Portland cement, graded sand and cellulose ethers, and some fast-setting grades add calcium aluminate cement. Cellulose ethers hold water in the bed for the open time and the cure.
Polymer, added as a redispersible powder or as a liquid latex, forms a film through the hardened cement. That film gives modified thinset its grip on dense porcelain and, at higher contents, its deformability, measured in Europe as the S1 and S2 classes; the polymers behind modified grades are described under redispersible polymer powders.
Drying of mastic and curing of reaction resins#
Mastic sets as the water of its polymer dispersion leaves the film, so it has low tolerance to water and to large impervious tiles that trap that water.
Reaction resins work the other way round. Epoxy and polyurethane adhesives, type R in EN 12004, set by the reaction of resin and hardener, independent of drying, so they cure under impervious tile and resist water once cured. R1 adhesives reach a shear adhesion of at least 2 N/mm² (290 psi) both initially and after water immersion.
9 Tile Installation Products in 3 Groups#
The 9 tile installation products fall into 3 groups: 4 adhesives and mortars that bed the tile, 3 grouts that fill the joints and 2 membranes that waterproof or decouple the substrate under it. The group table below compares the classes, function and governing documents of each group.
| Group | Classes | Function | Governing documents |
|---|---|---|---|
| Adhesives and mortars | thinset, H-rated mortars, mastic, reaction resin | bed the tile | EN 12004 / ISO 13007-1; ANSI A118.1, A118.4, A118.15, A118.11, A136.1, A118.3 |
| Grouts | cement, reaction resin, premixed organic | fill the joints | EN 13888-1:2022 / ISO 13007-3; ANSI A118.6, A118.7, A118.3, A118.19 |
| Membranes under tile | bonded waterproofing, uncoupling and crack isolation | waterproof or decouple | EN 14891; ANSI A118.10, A118.12 |
1. Tile adhesives and mortars (4)#
Tile adhesives and mortars are the bonding beds between tile and substrate; this group has 4 classes: cementitious tile adhesives, H-rated mortars, dispersion adhesives and reaction-resin adhesives. Cement classes cover the widest range of floors, walls and wet areas.
Cementitious tile adhesives (thinset)#
Cementitious tile adhesive is a powder of Portland cement, sand, cellulose ether and, in modified grades, polymer. EN 12004 classes it C1 or C2; the US splits it into ANSI A118.1-2023 dry-set, A118.4-2023 modified and A118.15-2023 improved modified mortar.
H-rated mortars for large tile#
H-rated mortars are polymer-rich cement mortars that hold large and heavy tile, 381 mm (15 in) or more on a side, in beds thicker than 6 mm (1/4 in). The ANSI suffix H (A118.4H, A118.15H) marks them, and European grades carry C2TE with S1 or S2.
Dispersion adhesives (mastic)#
Dispersion adhesives are ready-mixed polymer pastes that set by drying. EN 12004 classes them D1 and D2, and the US covers them as organic adhesives Type I and Type II under ANSI A136.1-2020 (R2025). They suit small tile on dry interior walls.
Reaction-resin adhesives#
Reaction-resin adhesives are two-part epoxy or polyurethane systems that cure chemically. EN 12004 classes them R1 and R2, with a shear adhesion of at least 2 N/mm² (290 psi); the US equivalent is setting epoxy under ANSI A118.3-2021 (R2025).
2. Tile grouts (3)#
Tile grouts are the joint fillers between tiles; this group has 3 classes: cement grouts, reaction-resin grouts and premixed organic grouts. Tile grout is not the structural non-shrink material sold as construction grouts.
Cement grouts (CG1, CG2)#
Cement grouts are cement, sand or fine filler and, in high-performance grades, polymer; their body stays porous. EN 13888-1:2022 classes them CG1 and CG2 with options A and W, and the US standards are ANSI A118.6-2019 and A118.7-2019.
Reaction-resin grouts (RG)#
Reaction-resin grouts are epoxy grouts that cure into a dense, non-porous joint. EN 13888-1:2022 calls them RG, and ANSI A118.3-2021 (R2025) requires a compressive strength above 24.1 MPa (3,500 psi) and shrinkage under 0.25 %.
Premixed organic grouts (A118.19)#
Premixed organic grouts are ready-to-use acrylic, urethane or hybrid dispersions with no cement. ANSI A118.19-2023 limits indentation to at most 1.14 mm (0.045 in), and these grouts are not for continuous submersion, movement joints or changes of plane.
3. Membranes under tile (2)#
Membranes under tile are the layers between substrate and adhesive that keep water out or absorb movement; this group has 2 classes: bonded waterproofing membranes and uncoupling or crack-isolation mats. Both take thin-set tile directly on top.
Bonded waterproofing membranes#
Bonded waterproofing membranes are liquid or sheet layers that tile is set on with thinset. ANSI A118.10-2023 governs them in the US; in Europe, EN 14891:2012 is the CE basis, with types CM (cementitious), DM (dispersion) and RM (reaction resin).
Uncoupling and crack-isolation mats#
Uncoupling and crack-isolation mats are sheets or films that stop substrate movement and cracks from reaching the tile. ANSI A118.12-2014 (R2024) rates crack isolation as Standard, 1.6 mm (1/16 in), or High Performance, 3 mm (1/8 in); A118.20 for uncoupling is only proposed.
Mastic vs Thinset vs Reaction Resin: How the Adhesive Types Compare#
Thinset, mastic and reaction-resin adhesives differ in how they set: thinset hydrates and suits floors, walls, porcelain and wet areas, mastic dries and suits small tile on dry interior walls, and reaction resins cure chemically for chemical-exposed floors. The verdict table below compares the three types by setting mechanism, class, wet-area use and VOC limit.
| Property | Thinset (C) | Mastic (D) | Reaction resin (R) |
|---|---|---|---|
| How it sets | cement hydration plus polymer film | drying of a polymer dispersion | reaction of resin and hardener |
| EN / ISO class | C1, C2 + options E, T, S1, S2 (cement only) | D1, D2 | R1, R2 |
| ANSI | A118.1, A118.4, A118.15 (2023); A118.11 for plywood | A136.1-2020 (R2025) | A118.3-2021 (R2025) |
| Porcelain | A118.4 or C2 minimum | not suited to large impervious tile | yes |
| Wet areas | yes, 95 % contact, over a membrane | no | yes |
| Deformability class | S1, S2 available | none defined | none defined |
| SCAQMD Rule 1168 VOC | 65 g/L (0.54 lb/gal), tile adhesive category | 65 g/L (0.54 lb/gal), tile adhesive category | 65 g/L (0.54 lb/gal), tile adhesive category |
| Verdict | default for floors, porcelain and wet areas | small tile, dry interior walls | chemical exposure |
Mastic or thinset for porcelain and wet areas#
Thinset to at least ANSI A118.4, or EN 12004 C2, is the class for porcelain, while mastic is limited to small tile on dry interior walls. Why does the same tile fail in mastic in a shower? Mastic sets only by drying, and a wet room keeps feeding it water while an impervious tile blocks the way out.
Porcelain needs polymer adhesion because its dense body offers cement almost nothing to key into, and ANSI A118.4-2023 requires a 4-week shear bond above 1.38 MPa (200 psi). C1 or A118.1 mortar on impervious tile is a recorded failure mode, along with bond loss on contaminated or smooth concrete.
Wet areas add a contact rule: showers and exteriors need at least 95 % mortar contact with all tile edges supported, against 80 % in dry interiors.
Reaction-resin adhesives for chemical exposure#
Reaction-resin adhesives (EN 12004 R, ANSI A118.3) bond tile where acids, cleaning chemicals or hot water would attack a cement bed. The selection pairs an R2 adhesive with an RG grout, so no cement bed remains, and harsh chemicals or steam cleaning call for furan grouts under ANSI A118.5 instead.
R2 adhesives add a shear adhesion of at least 2 N/mm² (290 psi) after thermal shock to the R1 requirements. In the US, ANSI A118.3-2021 (R2025) covers both setting epoxy and water-cleanable epoxy grout, with a quarry tile shear bond above 6.90 MPa (1,000 psi); resin and hardener chemistry is covered under epoxy resins and hardeners.
Where Are Tile Adhesives Used? Selection by Substrate and Exposure#
Tile adhesives are used on 6 substrate and exposure types (dry interior walls, porcelain floors, plywood subfloors, wet areas and pools, exteriors, and chemical-exposed floors), and the exposure sets the minimum class. The table below matches each case with its minimum EN or ISO class, the ANSI standard and the rule that governs it; a specification should name both.
| Substrate or exposure | Minimum EN / ISO class | ANSI | Key rule |
|---|---|---|---|
| Interior wall, small ceramic, dry | C1T or D1/D2 | A118.1 or A136.1 | mastic in dry areas only |
| Porcelain floors | C2 (TE) | A118.4 minimum | 80 % contact in dry areas |
| Plywood subfloor, interior | P1/P2 (ISO 13007-1 only) | A118.11 | exterior-glue plywood |
| Showers and wet rooms | EN 14891 CM or DM (O1, P) under the tile | A118.10 | 95 % contact |
| swimming pool waterproofing | EN 14891 type with P | A118.10 | 95 % contact |
| balcony and terrace waterproofing | C2 with S1/S2; grout CG2 | A118.4 or A118.15; grout A118.7 or better | 95 % contact |
| Chemical exposure | R2; grout RG | A118.3; A118.5 furan | no cement bed |
| Cracked or moving substrate | crack-bridging membrane | A118.12; A118.20 proposed only | membrane before tile |
Interior floors and walls on concrete and backer board#
Interior floors and walls take thinset on cured, absorbent concrete, cement beds, backer board or, with an ANSI A118.11 mortar, exterior-glue plywood. A118.11 requires a shear bond above 1.03 MPa (150 psi) for quarry tile on plywood, and gypsum or anhydrite screeds take tile only when dry and primed.
A water-sprinkle test checks the slab: water that beads on the surface shows a contaminant, which is removed mechanically, and smooth slabs are mechanically abraded before tiling. Profiles are graded under concrete surface profile.
Showers, wet rooms and pools#
Wet areas take a bonded waterproofing membrane under the tile and at least 95 % mortar contact, because neither thinset nor grout is the waterproofing layer. The membrane meets ANSI A118.10-2023 in the US or EN 14891 in Europe, where the option P marks resistance to chlorinated pool water and O1 marks crack bridging at −5 °C (23 °F).
Exterior terraces and balconies#
Exterior tile needs 95 % mortar contact, a deformable adhesive class and a grout of at least ANSI A118.7 or ISO 13007 CG2. A C2 adhesive with S1 or S2 deformability absorbs thermal movement, and TCNA guidance, as cited on a manufacturer detail, sets the A118.7 or CG2 grout minimum outdoors. Missing movement joints cause tenting, a failure TCNA detail EJ171 addresses.
Large-format tile and gauged porcelain panels#
Large tile, 381 mm (15 in) or more on any side, set in a bed thicker than 6 mm (1/4 in) needs an H-rated mortar, and gauged porcelain panels are set under ANSI A108.19-2025 (interior) and A108.20-2025 (exterior). Both panel standards call for modified or improved modified mortar.
Which Standards Govern Tile Adhesives, Grouts and Membranes?#
Tile adhesives, grouts and membranes are classified by 3 standard families: EN 12004, EN 13888 and EN 14891 in Europe, ISO 13007 internationally, and ANSI A118 and A136.1 in the US, with ANSI A108 setting how they are installed. Table 4 sets the editions and requirements side by side, using the TCNA status of 2026-09-10 for the US column.
| Product | Europe (CEN) | International | US (ANSI) | Requirement shown |
|---|---|---|---|---|
| Cement adhesive | EN 12004:2007+A1:2012 (CE basis); EN 12004-1:2017 (CEN current, not harmonised) | ISO 13007-1:2014 (confirmed 2025) | A118.1-2023; A118.4-2023; A118.15-2023; A118.11-2017 (R2022) | C1 at least 0.5 N/mm² (72.5 psi), C2 at least 1 N/mm² (145 psi) tensile; A118.4 above 2.07 MPa (300 psi) glazed wall, above 1.38 MPa (200 psi) porcelain shear; A118.15 above 3.10 MPa (450 psi) glazed wall, above 2.76 MPa (400 psi) porcelain mosaic; A118.11 above 1.03 MPa (150 psi) |
| Options | E, T, S1, S2 (cement only), F | adds P1, P2 | E, F, T, H | E open time at least 30 min; T slip at most 0.5 mm (0.020 in) (C, D); S1 2.5 to under 5 mm, S2 5 mm or more; ANSI F at least 0.34 MPa (50 psi) within 4 h |
| Dispersion (mastic) | D1, D2 | D1, D2 | A136.1-2020 (R2025) | values not stated |
| Reaction resin | R1, R2 | R1, R2 | A118.3-2021 (R2025) | R1 shear at least 2 N/mm² (290 psi) |
| Cement grout | EN 13888-1:2022 CG1, CG2 (A, W) | ISO 13007-3:2010 | A118.6-2019; A118.7-2019 | A118.7 compressive above 20.7 MPa (3,000 psi), shrinkage under 0.20 %, absorption under 5 % |
| Resin grout | EN 13888-1:2022 RG | ISO 13007-3:2010 | A118.3-2021 (R2025) | compressive above 24.1 MPa (3,500 psi), shrinkage under 0.25 % |
| Premixed grout | none | none | A118.19-2023 | indentation at most 1.14 mm (0.045 in) at 6.9 MPa (1,000 psi), 28 d dry |
| Waterproofing membrane | EN 14891:2012 (CE basis); EN 14891:2017 (CEN current); CM, DM, RM | none | A118.10-2023 | shear at least 0.34 MPa (50 psi); breaking at least 1.17 MPa (170 psi); no water penetration in 48 h |
| Crack isolation | none | none | A118.12-2014 (R2024); A118.20 proposed | Standard 1.6 mm (1/16 in), High Performance 3 mm (1/8 in) |
| Installation | none | none | A108.5-2023; A108.4-2023; A108.10-2026; A108.13-2005 (R2021); A108.17-2025; A108.19/.20-2025; A108.22-2023 | contact at least 80 % dry, 95 % wet and exterior |
ANSI values are shear bond and EN values tensile adhesion; they are not convertible. The US editions follow the ANSI A108/A118/A136.1 compilation, July 2026 edition.
EN 12004 and ISO 13007: tensile adhesion classes and CE marking#
EN 12004 classes cement adhesives by tensile adhesion: C1 at least 0.5 N/mm² (72.5 psi) and C2 at least 1 N/mm² (145 psi) after 4 conditionings. The 4 conditionings are initial, water immersion, heat ageing and freeze-thaw, tested to EN 1348, and the thresholds are unchanged in EN 12004-1:2017. ISO 13007-1:2014, confirmed in 2025, uses the same classes and adds P1 and P2 for plywood.
Options follow the class letters. E means an extended open time, with at least 0.5 N/mm² after at least 30 min against 20 min for the base classes; T means reduced slip of at most 0.5 mm (0.020 in) for C and D adhesives; S1 and S2 mark deformability; and F marks fast-setting adhesives. C2TE S1 thus reads as improved cement adhesive, reduced slip, extended open time, deformable; the full designation scheme is set out under EN 12004.
The CE mark and the declaration of performance still rest on EN 12004:2007+A1:2012, cited in the Official Journal (OJ 2018/C 092/06) and applicable since 2013-04-01, although CEN has cancelled it; EN 12004-1:2017, published 2017-02-14, is not harmonised. Regulation (EU) 2024/3110 applies from 2026-01-08, standards cited under Regulation (EU) 305/2011 keep applying until a family moves, and Delegated Regulation (EU) 2026/1310, in force since 2026-09-17, assigns tile adhesives AVS 3.
ANSI A118 and A136.1: shear bond requirements#
ANSI A118.4-2023 requires a 4-week shear bond above 2.07 MPa (300 psi) on glazed wall tile and above 1.38 MPa (200 psi) on porcelain, and A118.15-2023 raises both. Improved modified mortar to A118.15 must exceed 3.10 MPa (450 psi) on glazed wall tile and 2.76 MPa (400 psi) on porcelain mosaic, and A118.4 adds a 1-day impervious-tile shear above 0.52 MPa (75 psi).
Suffixes refine the class: E extended open time, F fast setting with at least 0.34 MPa (50 psi) shear within 4 h, T non-sag, and H large and heavy tile, never "high strength". The 2013 revision made A118.1 and A118.4 performance-based and added an ISO open-time test, optional slip and the 1-day impervious shear; each edition and suffix is listed under ANSI A118 and A136.
Why EN and ANSI results do not convert#
EN 12004 measures tensile adhesion and ANSI A118 measures shear bond, so a C2 result has no numeric ANSI equivalent. A tensile test pulls the tile straight off; a shear test pushes it sideways.
Indicative pairs exist for orientation only and carry no legal weight: A118.1 sits near C1, A118.4 near C2 (TE), A118.15 near C2TE S1 or S2, A118.11 near P1 or P2, A136.1 near D1 or D2, and A118.3 near R2. A two-market project reads the class on the data sheet or declaration of performance.
EN 13888, EN 14891 and ANSI standards for grouts and membranes#
Tile grouts are classed under EN 13888-1:2022 and ANSI A118.6, A118.7, A118.3 and A118.19, and membranes under EN 14891 and ANSI A118.10 and A118.12. EN 13888-1:2022 and EN 13888-2:2022, published 2022-09-13, replaced EN 13888:2009 and define CG1, CG2 with options A and W, F and RG; ISO 13007-3:2010 was confirmed in 2025.
EN 14891:2012 remains the CE basis for under-tile membranes, and EN 14891:2017 is the current CEN edition, which requires a tensile adhesion of at least 0.5 N/mm² (72.5 psi) in every conditioning and crack bridging of at least 0.75 mm (0.030 in). ANSI A118.10-2023 adds a breaking strength of at least 1.17 MPa (170 psi) and no water penetration after 48 h; CG and RG classes are explained under EN 13888-1 and EN 13888-2.
How Much Thinset Is Needed? Mortar Contact, Bed Thickness and Coverage#
Thinset is applied to reach at least 80 % mortar contact in dry interior areas and 95 % in wet areas and exteriors, in a bed of 2.38 to 6 mm (3/32 to 1/4 in) after embedding for mortars without an H rating.
Mortar contact and bed thickness after embedding#
Mortar contact is the share of the tile back covered by adhesive after the tile is embedded, checked by lifting a tile. ANSI A108.5 practice asks for at least 80 % in dry interior areas and at least 95 % in wet areas and exteriors, with all tile edges supported; 100 % is not required.
Low contact and skinned beds are the two recorded causes of hollow tiles. A bed skins when it sits past its open time. Bed thickness after embedding stays between 2.38 and 6 mm (3/32 and 1/4 in) for mortars without an H rating, with the Ceramic Tile Education Foundation naming 6 mm (1/4 in) as the maximum; thicker beds under large or uneven tile need an H-rated mortar.
Adhesive coverage per bag and notch size#
A 22.7 kg (50 lb) bag of thinset covers 7.4 to 8.8 m² (80 to 95 ft²) with a 6 × 6 mm (1/4 × 1/4 in) square notch, a practical figure and typical product value. The range comes from two makers' data sheets, Custom Building Products VersaBond at 85 to 95 ft² and Laticrete 253 Gold at 80 to 95 ft² per bag; quantities for other notches and grout joints come from the tile grout and adhesive calculator.
Coverage falls as the notch grows, and back-buttering large tile adds a second layer of mortar per tile.
VOC Limits and Safety Rules for Tile Adhesives and Grouts#
VOC limits for tile adhesives and grouts are set by air districts, not federally: South Coast AQMD Rule 1168 caps both at 65 g/L (0.54 lb/gal), while the EPA AIM rule sets no VOC limit for adhesives. Safety rules add cement, chromium (VI), silica, epoxy and diisocyanate controls on the job.
VOC limits by jurisdiction#
SCAQMD Rule 1168, as amended 2022-11-04, limits Ceramic, Glass, Porcelain, & Stone Tile Adhesive to 65 g/L (0.54 lb/gal), less water and exempt compounds. Grout, defined in the rule as a cement-based sealant that fills gaps including tile joints, carries the same 65 g/L (0.54 lb/gal); all categories are compared under VOC limits for construction chemicals.
The table below compares the limits and content rules in g/L (lb/gal) across the South Coast rule and the federal EPA rule.
| Category | SCAQMD Rule 1168 (amended 2022-11-04) | EPA AIM (40 CFR 59 subpart D) |
|---|---|---|
| Ceramic, Glass, Porcelain, & Stone Tile Adhesive | 65 (0.54), less water and exempt compounds | no federal adhesive limit |
| Grout (cement-based sealant definition) | 65 (0.54) | no federal limit |
| Polymer-free dry mixes mixed only with water | exempt from labeling subdivision (g) only; limits apply | not applicable |
| pCBtF and t-BAc above 0.01 % by weight | prohibited since 2024-01-01; sell-through to 2027-01-01; use-through to 2028-01-01 | not applicable |
Polymer-free dry mixes mixed only with water are exempt under (j)(7) from the labeling subdivision (g) only, never from the limits.
Cement, silica, epoxy and diisocyanate rules for tile setters#
Cement-based tile adhesives and grouts carry no harmonised classification: Portland cement has no Annex VI entry, and its ECHA C&L notified classification is H315, H317, H318, H335; see the product SDS. REACH Annex XVII entry 47 caps soluble chromium (VI) at 2 mg/kg (0.0002 %) of the total dry weight of the cement when hydrated, and packs using reducing agents show the packing date and storage period. Chromium(VI) reducing agents are cement additives, covered on cementadditives.org.
Liquid epoxy resin (CAS 25068-38-6) in reaction-resin adhesives and grouts carries harmonised CLP Annex VI classification (index 603-074-00-8): H315, H317, H319, H411; it is not Prop 65 listed as such. Polyurethane adhesives have no class entry, so the product SDS governs, and those with 0.1 % by weight or more diisocyanates carry a label statement since 2022-02-24 and need training before professional use since 2023-08-24, renewed at least every 5 years (REACH Annex XVII entry 74); training and labeling are set out under diisocyanates rules.
Mixing and cutting dust carries quartz (crystalline silica), and the 3 silica rules for tile setters are listed below.
- US: OSHA 29 CFR 1926.1153 sets a PEL of 50 µg/m³ as an 8-h TWA and an action level of 25 µg/m³, effective 2016-06-23.
- EU: Directive (EU) 2017/2398, amending Directive 2004/37/EC, sets a binding limit of 0.1 mg/m³ for the respirable fraction.
- California: Proposition 65 lists "Silica, crystalline (airborne particles of respirable size)" for cancer since 1988-10-01.
Complete List of Tile Installation Products: All 9 Classes#
The complete list below gives all 9 tile installation product classes with their chemistry, European and US standards, use and a dated cost where one is published.
| # | Class | Chemistry | EU / intl basis | US basis | Use | Cost (dated) |
|---|---|---|---|---|---|---|
| 1 | Cementitious tile adhesives (thinset), on this page; classes under tile adhesive classes | cement, sand, cellulose ether, polymer | EN 12004:2007+A1:2012 C1/C2 (CE basis); ISO 13007-1:2014 | ANSI A118.1, A118.4, A118.15 (2023); A118.11 | floors, walls, wet areas, porcelain | thinset, material, USD 11 to 38 per bag, US retail search snippet, Lowe's, 2026-10 |
| 2 | large and heavy tile mortars | high-polymer modified cement | C2TE (S1 or S2) | A118.4H, A118.15H; A108.19/.20-2025 | tile 381 mm (15 in) or more, panels | not published |
| 3 | Dispersion adhesives (mastic), on this page | acrylic or other polymer dispersion | EN 12004 D1/D2 | ANSI A136.1-2020 (R2025) | small tile, dry interior walls | not published |
| 4 | Reaction-resin adhesives, on this page | epoxy or polyurethane, two-part | EN 12004 R1/R2 | ANSI A118.3-2021 (R2025) | chemical exposure | not published |
| 5 | polymer-modified cement grouts | cement, sand or filler, polymer | EN 13888-1:2022 CG1, CG2; ISO 13007-3:2010 | ANSI A118.6-2019, A118.7-2019 | joints, interior and exterior | grouting, installed, USD 32.72 to 60.06 per m² (USD 3.04 to 5.58 per ft²), US national average, Homewyse, 2026-05 |
| 6 | epoxy tile grout | epoxy, hardener, filler | EN 13888-1:2022 RG | ANSI A118.3-2021 (R2025) | stain and chemical exposure | highest of the 4 ANSI grout classes (Construction Specifier, 2025-06-05) |
| 7 | premixed tile grouts | acrylic, urethane or hybrid dispersion | none | ANSI A118.19-2023 | ready to use, no sealing | between A118.7 and A118.3 (Construction Specifier, 2025-06-05) |
| 8 | tile waterproofing membranes | cement slurry, dispersion, resin, sheet | EN 14891:2012 (CE basis) CM, DM, RM | ANSI A118.10-2023 | showers, wet rooms, pools | not published |
| 9 | uncoupling and crack-isolation membranes | polyethylene mat; acrylic or PU film | none | ANSI A118.12-2014 (R2024) | cracked or moving substrates | not published |
"Not published" means no dated public range exists. Grouting runs from USD 32.72 to 60.06 per m² (USD 3.04 to 5.58 per ft²) installed (labor plus job supplies, basic, all grout types), US national average, according to Homewyse, 2026-05.
Construction Specifier ranked grout cost by ANSI class on 2025-06-05: A118.6 lowest, then A118.7, A118.19 and A118.3 highest. Cost, stain resistance and strength are compared under epoxy grout vs cementitious grout.
Which Tile Adhesive Is Best for a Project?#
No tile adhesive is best for every project: the right one is the class rated for the tile, substrate and exposure, named by standard (EN 12004 class or ANSI A118 number) on the specification, not by brand. A small ceramic wall tile in a dry hall takes C1T or mastic, a porcelain floor takes C2 or A118.4, a shower adds an A118.10 or EN 14891 membrane, and a chemical-exposed floor takes R2 with RG grout. Because EN and ANSI results do not convert, a specification for two markets names both.
Are tile adhesive and cement the same?#
No: thinset contains Portland cement, but it is a factory blend of cement, graded sand, cellulose ether and, in modified grades, polymer, classed by bond strength under EN 12004 or ANSI A118. Cement is the binder inside it; the classed product is the factory blend.
Is thinset waterproof?#
No: thinset and grout are not the waterproofing layer; wet areas take a bonded membrane to ANSI A118.10 or EN 14891 under the tile.
No tile grout is the waterproofing layer either, epoxy grout included. How membranes differ by water load is set out under waterproofing membranes and systems.
Which adhesive suits porcelain floor tile?#
Porcelain floor tile takes a modified thinset to at least ANSI A118.4, indicatively paired with EN 12004 C2, because C1 or A118.1 mortar on impervious tile is a recorded failure mode.
What tile adhesive do tile setters use?#
Tile setters choose by the standard the job calls for, which on porcelain and wet-area work means a modified mortar to ANSI A118.4 or A118.15 in the US or a C2 class adhesive in Europe. The 2 class marks a setter checks on a bag are listed below.
- The base class: C1 or C2 under EN 12004, or A118.1, A118.4 or A118.15 under ANSI.
- The options: E, T, F and S1 or S2 in Europe, or E, F, T and H in the US.
Is a flexible tile adhesive better?#
Flexible means an EN 12004 deformability class, S1 (2.5 to under 5 mm) or S2 (5 mm or more), which applies to cement adhesives only and is needed where the substrate moves. Large and heavy tile mortars carry it as C2TE S1 or S2.