Waterproofing membranes and systems are 13 product classes, from sheet and liquid-applied membranes to cementitious, crystalline and bentonite systems, that keep liquid water out of basements, roofs, decks, tanks and wet areas. Each class is built for a different water load, from soil moisture to permanent hydrostatic pressure, so which one fits which structure?
The 13 classes fall into 5 groups: sheet membranes, liquid-applied membranes, cementitious and crystalline systems, bentonite and joint systems, and moisture, vapor and air control products. Below-ground work in the UK calls the barrier "tanking", and UK "damp proofing" also names the treatment of rising damp in masonry walls, a different problem from foundation dampproofing. Waterproofing is one of the 15 families of construction chemicals.
The IRC 2024 and IBC 2024 demand waterproofing instead of dampproofing wherever hydrostatic pressure exists, and IBC 2024 1805.3.2 carries the membrane to 305 mm (12 in) above the maximum groundwater level. IRC 2024 membrane minimums are dry films of 1.02 mm (40 mil) and 1.52 mm (60 mil). VOC limits for waterproofing coatings run from 50 g/L (0.42 lb/gal) in the South Coast air district to 600 g/L (5.01 lb/gal) under the federal EPA rule. Published installed ranges, such as USD 21.53 to 53.82 per m² (USD 2 to 5 per ft²) for bentonite in the US (Fixr, 2026-02-06), are dated in the complete list below.
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 a Waterproofing Membrane?#
A waterproofing membrane is a continuous layer, preformed as a sheet or formed on site from a liquid, that stops liquid water, including water under hydrostatic pressure, from entering a structure. The IRC 2024 R406.2 lists six such materials for foundation walls, from two-ply hot-mopped felts to 1.52 mm (60 mil) solvent-free liquid synthetic rubber, and each one is rated to resist water under pressure.
Dampproofing and vapor retarders are not waterproofing membranes. Dampproofing, such as a bituminous coating or 1.63 kg/m² (3 lb/yd²) of acrylic-modified cement under IRC 2024 R406.1, only retards soil moisture and offers no resistance to hydrostatic pressure. Vapor retarders slow water vapor: ASTM E1643-24 states that under-slab vapor retarders are not intended to provide a waterproofing function.
What does a waterproofing system include besides the membrane?#
A waterproofing system includes 5 parts besides the membrane, listed below.
- Primers, which bond sheets and liquid membranes to the concrete or masonry substrate.
- Joint and penetration details, which IBC 2024 1805.3.3 requires to be made watertight with approved methods.
- Waterstops, such as PVC, rubber, hydrophilic or steel strips, which seal construction joints cast into the concrete.
- Protection course, such as a board or sheet that shields the membrane from backfill and traffic.
- Foundation drain (IRC 2024 R405.1), paired with dampproofing where no hydrostatic pressure exists (IBC 2024 1805.2).
How Do Waterproofing Membranes and Systems Work?#
Waterproofing products work in 4 ways: barrier membranes block water with a sheet or film, cementitious and crystalline systems densify the concrete, bentonite and hydrophilic strips swell into a seal, and dampproofing and vapor retarders slow moisture and vapor without resisting pressure. The mechanism decides which side of the wall a product can go on and which cracks it survives.
Barrier membranes: bitumen sheets, polymer films and polyurea#
Barrier membranes stop water with a sheet or film whose watertightness depends on laps and seams or on continuous film thickness. Sheets, such as bitumen, PVC, TPO, EPDM and HDPE, are watertight only at sealed laps. Liquid-applied membranes form a seamless bonded film by reaction, coalescence or cooling that bridges shrinkage cracks.
In polyurea, isocyanate reacts with an amine (pure) or amine-polyol (hybrid) component into an elastomer, and aromatic grades need an aliphatic topcoat where sunlight reaches them. Modified bitumen sheets come in two binder types: styrene-butadiene-styrene (SBS) gives elasticity and low-temperature flexibility, while atactic polypropylene (APP) gives the heat resistance that torch application needs. Binder grades and hot-work rules sit on polymer-modified bitumen.
Pore blocking and swelling: cementitious, crystalline and bentonite#
Cementitious and crystalline systems work on and inside the concrete, while bentonite seals by swelling under confinement. Cementitious waterproofing is a bonded mineral layer of cement, sand and, in modified grades, a polymer dispersion; it works on either side of a wall, stays open to vapor, and its flexible grades bridge fine static cracks.
Crystalline treatments grow crystals in the capillaries and fine static cracks of saturated concrete. They never seal moving cracks and never work on dry concrete, because the reaction needs water. Bentonite clay swells into a seal only when it is confined between soil and concrete, and saline groundwater suppresses that swelling.
Bonded or loose-laid: why lateral water migration matters#
A fully bonded membrane keeps a leak at the defect, while water behind a loose or post-applied sheet travels to the next joint or crack. That lateral migration is why a leak inside a basement can appear meters away from the hole in the membrane.
Hot fluid-applied rubberized asphalt, a 100 % solids membrane, restricts lateral migration because it bonds to the deck. Pre-applied sheets placed against formwork bond to the concrete poured onto them and block lateral migration in the same way; sheets placed before the pour are covered under blindside and pre-applied waterproofing.
13 Types of Waterproofing Membranes and Systems in 5 Groups#
The 13 types of waterproofing membranes and systems fall into 5 groups: 2 sheet classes, 4 liquid-applied classes, 2 cementitious classes, 2 swelling and joint classes and 3 moisture, vapor and air control classes. The group table below compares the mechanism and the basis on which each group's thickness is specified.
| Group | Classes | Mechanism | Thickness basis |
|---|---|---|---|
| Sheet | sheet membranes, modified bitumen | factory sheet, watertight at laps | roll thickness |
| Liquid-applied | liquid membranes, polyurea, hot-applied rubberized asphalt, roof coatings | film by reaction, coalescence or cooling | dry film thickness (DFT) |
| Cementitious and crystalline | cementitious, crystalline | bonded mineral layer; pore densification | coat thickness |
| Bentonite and joints | bentonite, waterstops | swelling under confinement; joint barrier | per m² or per linear m |
| Moisture, vapor and air control | dampproofing, vapor retarders, air barriers | retard moisture, vapor or air | DFT or sheet thickness |
1. Sheet membranes (2)#
Sheet membranes are factory-made rolls laid or bonded onto the substrate and joined at sealed laps; this group has 2 classes: sheet waterproofing membranes and modified bitumen membranes. Both carry a known roll thickness, so quality control shifts to lap sealing and protection.
Sheet waterproofing membranes#
Sheet waterproofing membranes are factory sheets of bitumen, PVC, TPO, EPDM or HDPE used on roofs and below grade. TPO follows ASTM D6878/D6878M-26 and PVC ASTM D4434/D4434M-21; in Europe roof sheets follow EN 13956:2012 and tanking sheets EN 13967:2012. Every lap is a potential leak path.
Modified bitumen membranes#
Modified bitumen membranes are bitumen sheets modified with SBS or APP and laid in one or more plies. SBS cap sheets follow ASTM D6164/D6164M-26, and the European CE basis is EN 13707:2004+A2:2009. APP sheets are torch-applied, so hot-work rules govern every roofing job.
2. Liquid-applied membranes (4)#
Liquid-applied membranes are products poured, rolled, sprayed or hot-mopped onto the substrate that cure into a seamless film; this group has 4 classes: liquid-applied membranes, polyurea, hot fluid-applied rubberized asphalt and liquid roof coatings. Their watertightness depends on the dry film thickness reached on site.
Liquid-applied membranes#
Liquid-applied membranes are seamless films of polyurethane, PMMA, acrylic or bitumen emulsion bonded to the substrate. ASTM C836/C836M-18(2022) covers buried membranes with a separate wearing course, and EAD 030350-00-0402 covers European roof kits. The IRC 2024 lists 1.02 mm (40 mil) polymer-modified asphalt.
Polyurea membranes#
Polyurea membranes form when an isocyanate component reacts with an amine (pure) or amine-polyol (hybrid) component, on decks, roofs and linings. No ASTM product standard exists for polyurea, so data sheets quote test methods only. EU applicators need documented diisocyanate training.
Hot fluid-applied rubberized asphalt#
Hot fluid-applied rubberized asphalt is a 100 % solids membrane melted in a kettle and applied hot to concrete decks. ASTM D6622/D6622M-20 is an installation guide, not a product standard. Under EAD 030350-00-0402 these kits go only on concrete and are always buried under protection.
Liquid roof coatings#
Liquid roof coatings are acrylic, silicone, polyurethane or asphalt coatings applied over existing low-slope roofs, metal roofs or sprayed foam. Acrylic coatings follow ASTM D6083/D6083M-24, silicone ASTM D6694/D6694M-25 and moisture-cured polyurethane ASTM D6947/D6947M-16(2023). They restore commercial roofs, not new below-grade work.
3. Cementitious and crystalline (2)#
Cementitious and crystalline systems are mineral products that bond to or react inside concrete and masonry; this group has 2 classes: cementitious waterproofing and crystalline waterproofing. Both tolerate damp substrates and both work on the negative side.
Cementitious waterproofing#
Cementitious waterproofing is a slurry of cement, sand and polymer dispersion brushed or troweled onto either side of a wall. Surface protection products follow EN 1504-2:2004, and under-tile versions follow EN 14891:2012, the CE basis, as type CM. Rigid grades crack with the substrate.
Crystalline waterproofing#
Crystalline waterproofing is a cement-based coating whose active chemicals grow crystals in the pores of saturated concrete. BS 8102:2022 classes it as a Type A cementitious crystallization coating. Integral crystalline admixtures are covered on concreteadditives.net. Moving cracks defeat it.
4. Bentonite and joint systems (2)#
Bentonite and joint systems are products that seal by swelling or by bridging a joint in the concrete; this group has 2 classes: bentonite waterproofing and waterstops. Bentonite covers areas, while waterstops cover the construction and movement joints between pours.
Bentonite waterproofing#
Bentonite waterproofing is sodium bentonite in panels, geocomposites or HDPE composites that swells into a seal when confined between soil and concrete. BS 8102:2022 calls it an active core liner. Saline groundwater suppresses the swelling, so groundwater chemistry is checked first.
Waterstops#
Waterstops are PVC, rubber, hydrophilic, steel or injection-hose strips cast across concrete joints. PVC waterstops to CRD-C572-74 reach a tensile strength of at least 12.07 MPa (1,750 psi) and an elongation of at least 300 %; DIN 18541-1:2021-01 covers thermoplastic waterstops in Germany.
5. Moisture, vapor and air control (3)#
Moisture, vapor and air control products are coatings and sheets that slow soil moisture, water vapor or air rather than resisting water pressure; this group has 3 classes: dampproofing, under-slab vapor retarders and fluid-applied air barriers. None of the 3 classes replaces a waterproofing membrane.
Dampproofing#
Dampproofing is a bituminous or cementitious foundation coating that retards soil moisture where no hydrostatic pressure exists. IRC 2024 R406.1 and IBC 2024 1805.2 set the materials, including 3.2 mm (1/8 in) surface-bonding cement to ASTM C887-20. It fails wherever water pressure builds.
Under-slab vapor retarders#
Under-slab vapor retarders are polyolefin or bituminous sheets placed under concrete slabs. ASTM E1745-17(2023) sets a permeance of at most 0.1 perm (5.72 ng/(Pa·s·m²)) for Classes A, B and C, and the classes differ by strength. ASTM E1643-24 excludes a waterproofing function.
Fluid-applied air barriers#
Fluid-applied air barriers are silyl-terminated polyether (STPE) or emulsion films that stop air leakage through wall envelopes. ASTM E2178-21a measures material air permeance at 75 Pa without a pass/fail limit, and ASTM E2357-25 tests the assembly. Housewraps and sheet barriers fall outside this class.
Sheet vs Liquid vs Crystalline: How the Main Waterproofing Types Compare#
Sheet, liquid, cementitious and crystalline waterproofing differ in where the barrier sits: sheets and liquid films form a separate layer on the water side, cementitious coatings form a bonded layer on either side, and crystalline treatments densify the concrete itself. The verdict table below compares the 5 main below-grade types by position, cracks, failure mode and governing documents.
| Attribute | Sheet | Liquid | Cementitious | Crystalline | Bentonite |
|---|---|---|---|---|---|
| Position | water-side layer | water-side film | either side, bonded | inside the concrete | confined behind concrete |
| Negative side | no | no | yes | yes | no |
| Cracks | laps take movement | bridges shrinkage cracks | flexible grades bridge fine static cracks | static only; manufacturer claim up to 0.5 mm (0.02 in), no standard | self-seals small punctures |
| Failure mode | lap failure | low wet film | debonding | dry substrate, moving cracks | lost confinement |
| US basis | ASTM D-series sheets; IRC 2024 R406.2 felts | ASTM C836/C836M-18(2022); IRC 2024 1.02 mm (40 mil) | IRC 2024 R406.2, 1.52 mm (60 mil) flexible polymer cement | test methods only (CRD-C48-92) | IBC 2024 1805.3 (approved method) |
| EU basis | EN 13967:2012 (CE basis) | EAD 030350-00-0402 | EN 1504-2:2004 | EN 12390-8:2019 (test) | BS 8102:2022 liner |
On the negative side, a drained cavity system (BS 8102:2022 Type C) is the alternative to cementitious and crystalline coatings.
Crystalline vs membrane waterproofing#
Crystalline waterproofing treats the concrete, a membrane adds a separate layer, and the choice turns on crack movement and access. Makers claim crystalline coatings self-seal static cracks up to 0.5 mm (0.02 in), and no standard measures that claim. A membrane bridges the cracks it is rated for but needs access to the water side.
Access decides the negative side. Only cementitious or crystalline coatings, or a drained cavity system under BS 8102:2022 Type C, work against water pushing from behind; film coatings and sheets peel off under that pressure. The positive and negative side are compared under interior and negative-side basement waterproofing.
What does a test prove? EN 12390-8:2019 measures water penetration depth at (500 ± 50) kPa for (72 ± 2) h, and CRD-C48-92 tests permeability at 1.38 MPa (200 psi). Neither sets a pass/fail limit for crystalline products.
Sheet vs liquid membranes#
Sheets bring a factory-controlled thickness and depend on their laps; liquids are seamless and depend on the film thickness applied on site. A sheet fails at a lap or a backfill puncture; a liquid fails where too little wet film went on. What decides between them on a detailed deck?
Detail density decides. Decks with drains, upstands and penetrations favor liquids, because every corner of a sheet becomes a lap. ASTM C836/C836M-18(2022) covers liquid membranes under a separate wearing course, while ASTM C957/C957M-25 covers membranes with an integral wearing surface, tested on specimens with at least 0.5 mm (0.020 in) DFT. In Europe, tanking sheets carry CE marking to EN 13967:2012 and liquid roof kits an assessment to EAD 030350-00-0402.
Where Are Waterproofing Membranes Used? Selection by Structure and Water Load#
Waterproofing membranes are used on 6 structure types (basements and foundations, roofs and terraces, parking structures, bridges and tunnels, tanks and pools, and tiled wet areas), and the water load at each one sets the class. The table below matches each structure with its water load, the classes that suit it and the rule that governs the choice; a specification should name the class by standard and code section.
| Structure | Water load | Classes | Key rule |
|---|---|---|---|
| basement waterproofing | soil moisture to hydrostatic | dampproofing, sheets, liquids, cementitious, crystalline, bentonite | IBC 2024 1805.3.2 |
| roof waterproofing | rain, ponding | sheets, modified bitumen, liquids, polyurea, coatings, hot-applied | slope at least 2 % (1/4:12), IBC 2021 |
| parking structure waterproofing | water, de-icing chlorides | traffic coatings, hot-applied under topping | ASTM C957/C957M-25 |
| bridges, tunnels and marine structures | traffic, groundwater | sheets, sprayed membranes, waterstops | EAD 030675-00-0107 (bridge decks) |
| water-retaining structures | internal head, potable contact | crystalline, cementitious, polyurea, waterstops | moving cracks: injection, then flexible lining |
| tile waterproofing membranes | shower water | under-tile membranes | ANSI A118.10-2023, EN 14891:2012 |
Basements and foundations#
Basement walls get waterproofing where hydrostatic pressure exists and dampproofing where it does not, and IBC 2024 1805.3.2 carries the membrane to 305 mm (12 in) above the maximum groundwater level. Where the lowest floor is below grade, IBC 2024 1803.5.4 requires an investigation to determine whether groundwater lies above or within 1.52 m (5 ft) below it.
Cold liquid-applied products reach US evaluation under ICC-ES AC29, editorially revised 2024-03. Membranes and coatings on the soil side are compared under exterior foundation waterproofing.
Roofs, terraces and plaza decks#
Flat roofs and terraces take sheets, liquid membranes or coatings laid to a slope of at least 2 % (1/4:12) under IBC 2021. In Europe, EAD 030350-00-0402 assesses liquid roof kits for working lives of 5, 10 or 25 years, but excludes vehicle-accessible roofs and bridges. Plaza decks take a buried ASTM C836 membrane or hot-applied rubberized asphalt with protection and drainage above it.
Parking structures, bridges and tunnels#
Parking decks and bridges take membranes rated for traffic, de-icing chlorides and wear, while tunnels take sheets, sprayed membranes and segment gaskets. Exposed parking membranes carry an integral wearing surface under ASTM C957/C957M-25; buried ones sit under a topping.
European bridge decks use liquid kits assessed to EAD 030675-00-0107, cited in the Official Journal in 2023. Deck systems and wear coats are compared under traffic coatings for parking decks.
Tanks, pools and wet areas#
Tanks and pools hold water on the inside, so their linings face internal head and, for drinking water, a potable-contact approval per product. Crystalline, cementitious and polyurea linings and waterstops at joints suit tanks; a moving crack is injected first and then covered with a flexible lining. Tiled showers take under-tile membranes to ANSI A118.10-2023 in the US and EN 14891:2012 in Europe.
Which Codes and Standards Govern Waterproofing Products?#
Waterproofing products are governed in 3 layers: product standards and assessment documents (ASTM in the US, EN and EAD in Europe), building codes and design standards (IBC and IRC, BS 8102:2022, DIN 18533-1:2026-06), and test methods for pressure, cracks and leaks. A specification that names one document from each layer leaves no doubt about the product, the design and the acceptance test.
IRC and IBC building code requirements#
The IRC 2024 and IBC 2024 require waterproofing instead of dampproofing wherever a high water table or hydrostatic pressure exists (IRC R406.2, IBC 1805.3). IRC 2024 R406.2 lists 6 materials: two-ply hot-mopped felts, 25 kg (55 lb) roll roofing, 1.02 mm (40 mil) polymer-modified asphalt, 1.52 mm (60 mil) flexible polymer cement, 3.2 mm (1/8 in) cement-based fiber-reinforced coating and 1.52 mm (60 mil) solvent-free liquid synthetic rubber; 0.15 mm (6 mil) polyethylene is no longer an option. Walls of expanded polystyrene insulating concrete forms take no organic-solvent products; asphalt to ASTM D449 Type C, applied below 93 °C (200 °F). IBC 2024 1805.1.3 allows dampproofing where groundwater is lowered at least 152 mm (6 in) below the lowest floor.
EN product standards, EADs and CE marking#
European waterproofing products carry CE marking through a harmonised EN standard or an EAD, and each declaration names the edition it was assessed to. Tanking sheets carry CE marking to EN 13967:2012 (the 2017 amendment is current at CEN but not cited), reinforced bitumen roof sheets to EN 13707:2004+A2:2009 and plastic and rubber roof sheets to EN 13956:2012.
Liquid roof kits have no harmonised standard: EAD 030350-00-0402 (August 2018, cited in 2020) replaced ETAG 005:2000, silicone kits use EAD 030019-00-0402, and polymer-modified bitumen thick coatings follow EN 15814:2011+A2:2014. Regulation (EU) 2024/3110 entered into force on 2025-01-07 and applies from 2026-01-08, while standards cited under Regulation (EU) 305/2011 keep applying until a product family moves; dates and transition rules are set out under EU Construction Products Regulation.
Under-tile membranes keep EN 14891:2012 as the CE basis; EN 14891:2017 is current at CEN but not harmonised.
UK and German design standards for below-ground structures#
BS 8102:2022 in the UK and DIN 18533 in Germany design below-ground waterproofing by water exposure, not by product. BS 8102:2022, published 2022-03-31, sets 4 grades of internal environment (1a, 1b, 2 and 3) and 3 protection types: Type A barrier, Type B structurally integral and Type C drained.
The British standard also grades the water table as low, variable or high and names bentonite and polymer liners "active core liners". Grades and protection types are explained under BS 8102:2022.
In Germany, DIN 18533-1:2026-06 and DIN 18533-3:2026-06 are the current parts for waterproofing in contact with soil; DIN 18533 replaced DIN 18195 in 2017.
Test methods for hydrostatic pressure, crack movement and leaks#
Five test methods check waterproofing on site and in the lab, listed below.
- EN 12390-8:2019: water penetration depth at (500 ± 50) kPa for (72 ± 2) h, with no pass/fail limit.
- ASTM D5385/D5385M-25: laboratory hydrostatic pressure resistance of waterproofing membranes.
- ASTM D5957-98(2021): flood test of horizontal waterproofing at a slope of at most 2 %, with water stored no more than 48 h, not for roofs.
- ASTM D7877-25: guide to electronic leak detection on membranes.
- ASTM D8231-24a: low-voltage scanning for membrane leak detection.
How Thick Is a Waterproofing Membrane? Wet vs Dry Film and Coverage#
Code membrane minimums are dry film thicknesses: the IRC 2024 lists 1.02 mm (40 mil) polymer-modified asphalt and 1.52 mm (60 mil) solvent-free liquid synthetic rubber, and a liquid membrane's dry film equals its wet film times volume solids. Sheets have the thickness of the roll; liquids reach theirs only when the crew applies enough wet film.
Wet film, dry film and volume solids#
Dry film thickness equals wet film thickness times volume solids, so a 50 % solids membrane loses half its wet thickness as it cures. Crews gauge wet film; codes state dry film.
Coverage follows from the same identity: 1 US gal covers 1,604 ft² at 1 mil DFT and 100 % volume solids, and in metric units coverage in m²/L equals 1,000 times volume solids divided by DFT in µm. As a worked example, take a membrane with 100 % volume solids (input 1) applied at 1.02 mm (40 mil) DFT (input 2): theoretical coverage is 1,000 / 1,016 µm = 0.98 m²/L (40.1 ft²/gal), before losses.
At 50 % volume solids the same DFT gives 0.49 m²/L (20.1 ft²/gal) and needs 2.03 mm (80 mil) of wet film. Practical coverage is lower, because profile, details and waste consume material.
Substrate and weather conditions at application#
Liquid membranes go onto a surface at least 3 °C (5.4 °F) above the dew point, measured on the substrate (ISO 8502-4:2017). US data sheets round the margin to 5 °F. The required surface texture comes from the product data sheet, and profiles are graded under concrete surface profile.
Moisture in the slab is measured, not guessed. ASTM F2170-19a (relative humidity in the slab) and ASTM F1869-23 (moisture vapor emission rate) are test methods without a pass/fail value; the moisture limit is the product maker's.
Crystalline coatings reverse the rule: they need saturated concrete, because the crystal reaction uses the water in the pores. Crystalline coating data sheets state a surface profile of at least ICRI CSP 3, application at 4 °C (40 °F) or warmer and about 3 days of moist curing.
VOC Limits and Safety Rules for Waterproofing Products#
VOC limits for waterproofing coatings run from 50 g/L (0.42 lb/gal) for roof coatings and unlisted coatings in the South Coast air district to 600 g/L (5.01 lb/gal) for waterproofing sealers under the federal EPA rule. Safety rules add diisocyanate training in the EU, cement and silica rules, and hot-work controls for bitumen.
VOC limits by jurisdiction#
The South Coast AQMD has no waterproofing membrane category, so an unlisted membrane falls under the Default limit of 50 g/L (0.42 lb/gal) in Rule 1113 as amended 2016-02-05. The table below compares the limits in g/L (lb/gal) across the South Coast rule and the federal EPA AIM rule; every category is listed under VOC limits for construction chemicals.
| Category | SCAQMD Rule 1113 (amended 2016-02-05) | EPA AIM (made on or after 1999-09-13) |
|---|---|---|
| Roof coatings | 50 (0.42); aluminum 100 (0.83) | 250 (2.09) |
| Waterproofing membranes | no category: Default 50 (0.42) | not stated |
| Roof primers, bituminous | 350 (2.92) | not stated |
| Bituminous coatings and mastics | not stated | 500 (4.17) |
| Waterproofing sealers | 100 (0.83) | 600 (5.01) |
| Building envelope coatings | 50 (0.42) since 2019-01-01 | not stated |
| Hot-applied modified bitumen and built-up roof adhesive (Rule 1168, amended 2022-11-04) | 30 (0.25) since 2023-01-01 | no federal adhesive limit |
The CARB 2019 Suggested Control Measure binds only where an air district adopts it, and no federal VOC limit exists for adhesives.
In the EU, Directive 2004/42/EC Phase II (since 2010-01-01) caps one-pack and two-pack reactive performance coatings, categories (i) and (j), at 140 g/L (1.17 lb/gal) water-based and 500 g/L (4.17 lb/gal) solvent-based, for products within its scope.
Diisocyanate, cement and silica rules for applicators#
Polyurethane and polyurea products with at least 0.1 % diisocyanates by weight need a label statement since 2022-02-24 and documented training before professional use since 2023-08-24 (REACH Annex XVII entry 74). The training is renewed at least every 5 years. Polyurethane resins have no Annex VI entry as a class (see the product SDS), while isocyanate monomers carry harmonised H334 and H317; chemistry and exposure rules for polyurethane resins are set out on their material page.
Cement-based slurries and crystalline coatings carry the cement hazard line: No Annex VI entry; ECHA C&L notified classification: 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. For respirable crystalline silica, OSHA 29 CFR 1926.1153 sets a PEL of 50 µg/m³ and an action level of 25 µg/m³ (effective 2016-06-23).
Bitumen has no Annex VI entry (97.8 % of ECHA C&L notifications: not classified); its site hazards are hot-application burns and fumes. Asphalt fumes have no OSHA PEL, and NIOSH sets a REL of "Ca" with a ceiling of 5 mg/m³ (15 minutes). Bentonite (CAS 1302-78-9): No Annex VI entry; ECHA C&L notified: not classified (65.9 %), yet bentonite products are never described as non-hazardous; see the product SDS.
Complete List of Waterproofing Membranes and Systems: All 13 Classes#
The complete list below gives all 13 waterproofing product classes with their chemistry, US and European standards, typical use, applicator need and a dated installed cost where one is published.
| Class | Chemistry | US basis | EU basis | Typical use | Applicator | Cost (dated) |
|---|---|---|---|---|---|---|
| sheet waterproofing membranes | bitumen, PVC, TPO, EPDM, HDPE | ASTM D6878/D6878M-26, D4434/D4434M-21 | EN 13956:2012; EN 13967:2012 (CE basis) | roofs, below grade | yes | TPO installed USD 69.97 to 161.46 per m² (USD 6.50 to 15.00 per ft²), US, 2026-04, CES Roofing |
| modified bitumen membranes | SBS or APP bitumen | ASTM D6164/D6164M-26 | EN 13707:2004+A2:2009 (CE basis) | low-slope roofs, tanking | yes | installed USD 43.06 to 96.88 per m² (USD 4.00 to 9.00 per ft²), US, 2026-04, CES Roofing |
| liquid-applied waterproofing membranes | PU, PMMA, acrylic, bitumen emulsion | ASTM C836/C836M-18(2022) | EAD 030350-00-0402; EN 15814:2011+A2:2014 | roofs, decks, foundations | yes (roof kits, decks) | not published |
| polyurea waterproofing membranes | isocyanate + amine (pure) or amine-polyol (hybrid) | no ASTM product standard (test methods only) | EAD 030350-00-0402; EN 1504-2:2004 | decks, roofs, linings | yes | not published |
| hot fluid-applied rubberized asphalt | rubberized asphalt, 100 % solids | ASTM D6622/D6622M-20 (guide) | EAD 030350-00-0402 (protected) | plaza decks, buried roofs | yes | not published |
| liquid roof coatings | acrylic, silicone, PU, asphalt | ASTM D6083/D6083M-24, D6694/D6694M-25 | EAD 030019-00-0402 (silicone) | roof restoration | depends | acrylic coating, commercial installed USD 16.15 to 43.06 per m² (USD 1.50 to 4.00 per ft²); silicone coating, commercial installed USD 21.53 to 53.82 per m² (USD 2.00 to 5.00 per ft²), Southern California, 2026, Method Roofing |
| cementitious waterproofing | cement, sand, polymer dispersion | IRC 2024 R406.2 (1.52 mm (60 mil) flexible polymer cement) | EN 1504-2:2004; EN 14891:2012 (under tile) | basements, tanks | depends | tanking slurry installed (tanking only) GBP 26 per m² ex VAT, UK, 2026-10, Bricken, modelled estimate |
| crystalline waterproofing coatings | cement, sand, active chemicals | none (test methods) | EN 12390-8:2019 (test) | basements, tanks, negative side | depends | not published |
| bentonite waterproofing | sodium bentonite composites | IBC 2024 1805.3 (approved method) | BS 8102:2022 liner | blindside, below slab | yes | installed USD 21.53 to 53.82 per m² (USD 2 to 5 per ft²), US, 2026-02-06, Fixr |
| waterstops for concrete joints | PVC, rubber, hydrophilic, steel, hoses | CRD-C572-74 (PVC) | DIN 18541-1:2021-01 | joints, penetrations | yes | not published |
| dampproofing | asphalt; acrylic-modified cement | IRC 2024 R406.1, IBC 2024 1805.2 | EN 15814:2011+A2:2014 (PMBC) | foundations without water pressure | depends | installed USD 32.29 to 64.58 per m² (USD 3 to 6 per ft²), US, 2026-02-06, Fixr |
| under-slab vapor retarders | polyolefin or bituminous sheet | ASTM E1745-17(2023) | EN 13967:2012 (CE basis) | under slabs | depends | material, 0.38 mm (15 mil) sheet, USD 4.84 to 7.00 per m² (USD 0.45 to 0.65 per ft²), US, 2026, Overlake Supply |
| fluid-applied air barriers | STPE, emulsions | ASTM E2178-21a, E2357-25 | none stated | wall envelope | yes (commercial) | not published |
"Not published" means no dated public range exists; the price then follows from area, thickness, details and access.
Whole-job basement prices run from USD 32.29 to 107.64 per m² (USD 3 to 10 per ft²) installed in the US, according to Fixr's guide updated 2026-02-06. Whole-job prices are compared under basement waterproofing cost.
Which Waterproofing Membrane Is Best for a Project?#
No waterproofing membrane is best for every project: the right class is the one rated for the structure's water load, substrate, movement and access, and a specification names it by standard and code section, not by brand. A basement without hydrostatic pressure needs dampproofing under IBC 2024 1805.2 and a foundation drain under IRC 2024 R405.1, while the same basement below the water table needs a membrane under IRC 2024 R406.2 or IBC 2024 1805.3. Without soil-side access, cementitious, crystalline or a drained cavity remain.
How long does a waterproofing membrane last?#
Service life is not one number: EAD 030350 assesses liquid roof kits for assumed working lives of 5, 10 or 25 years (W1 to W3), which are assessment categories, not guarantees. The default assumption is 10 years. Real service life depends on detailing, protection, traffic and maintenance.
Is a vapor barrier a waterproofing membrane?#
No: ASTM E1643-24 states that under-slab vapor retarders are not intended to provide a waterproofing function. A sheet meeting ASTM E1745-17(2023) limits vapor to 0.1 perm but does not resist hydrostatic pressure.
Is a concrete sealer a waterproofing membrane?#
No: a penetrating concrete sealer repels water at the surface but forms no continuous layer against hydrostatic pressure.
Sealer types and VOC limits, such as 100 g/L (0.83 lb/gal) for waterproofing sealers in the South Coast district, are compared under concrete sealers.
Does a waterproofing membrane need protection before backfill?#
Yes: below-grade sheets and coatings get a protection course before backfill, and hot rubberized asphalt is always buried under protection. Backfill stones puncture unprotected sheets, and the damage stays hidden until water arrives.
Do waterproofing membranes need a specialist applicator?#
Most do: 8 of the 13 classes need a trained applicator, from plural-component polyurea rigs and hot kettles to torch-applied sheets, and EU users of diisocyanate products need documented training. The other 5 classes, such as dampproofing and vapor retarders, can be installed by the foundation or concrete trade.
Is crystalline waterproofing a membrane?#
No: BS 8102:2022 classes it as a Type A cementitious crystallization coating that densifies the concrete instead of forming a separate layer. It adds no film, so it bridges no moving crack.