WATERPROOFING
SEMCO LIQUID MEMBRANE™
Advanced waterproofing membrane and crack bridging protection.
The SEMCO Liquid Membrane™ is a single component water-based waterproofing and anti-fracture membrane. This revolutionary blend enables easy application while providing excellent crack bridging and waterproofing for long-lasting protection.
Why SEMCO Liquid Membrane™?
The SEMCO Liquid Membrane™️ is a ready-to-use waterproofing and anti-fracture membrane in one, safe to use both indoors and outdoors. This waterproofing membrane is commonly used for foundations, ICF's, basements, shower liners, deck and fence posts and planter boxes. It can be applied to almost any substrate, from metal and wood to concrete surfaces and many more. The formula contains no solvents, is non-toxic, VOC-free, and boasts plenty of other benefits too:
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SEMCO Liquid Membrane™ is a water-based, single-component membrane. Simply open the container and apply 2 coats with roller, sprayer or brush, creating a total thickness of 30 mils wet.
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Forms a continuous waterproofing and anti-fracture barrier with exceptional adhesion, solving two problems at once. Fix leaks, waterproof new surfaces, and repair damage all with one product.
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Up to 1300% stretch and elongation, SEMCO Liquid Membrane™ is designed to inhibit the propagation of cracks from the substrate to the surface. Stabilizes substrates for surface finish products.
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Suitable for interior, exterior, and fully submerged in water applications. Ready to apply on a range of substrates including concrete, wood, stone, interior & exterior cladding, metal, aluminum, plaster, MDF, bricks, under tiles & more.
Application Areas
✓ Concrete
✓ Under tiles
✓ Wood, Ply, MDF
✓ Roofs
✓ Swimming Pools
✓ Fountains
✓ Basements
✓ RV
✓ Metal / Aluminum
✓ Retaining block walls / concrete
SEMCO Liquid Membrane™ everything.
For over 25 years, I have been developing a line of surface products designed to meet the diverse needs of our clients. Along the way, I have been met with many challenges. Our clients wanted a product that streamlined the waterproofing process, offered the durability and strength to stabilize multiple surface types and wood substrates, and also function as a waterproof adhesive. Unlike many product on the market that only accomplish one or two of these requirements, my goal was to create a single, high-performance solution that could meet all of them. That “one source” solution is: SEMCO LIQUID MEMBRANE™
— Samel Sem, Founder, SEMCO Surfaces
SEMCO Liquid Membrane™ in action
Your most common questions, answered.
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The SEMCO Liquid Membrane™ is a single-component waterproofing and anti-fracture membrane. It is a self-contained elastomeric fluid suspended in a copolymer adhesive, this revolutionary blend enables easy application while providing excellent bridging, and waterproofing. SEMCO Liquid Membrane™ creates a continuous waterproof membrane barrier with outstanding adhesion and reduces crack transmission in tile, concrete and stone floors.
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Easy to use – can be applied with a roller or brush
Rated for heavy duty service
Suitable for waterproofing pools, water features, showers and wood surfaces
1300% stretch and elongation. Stabilizes wood substrates to receive surface finish products
500 PSI or 3.44 N/mm2 adhesion
Quick drying time allows you to proceed within 2 hrs of application with your finish
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SEMCO Liquid Membrane™ is the perfect self-adhering membrane for waterproofing almost any hard surface. Use it for your shower, fountain, pool interior and protect it from long-term water or moisture damage.
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Concrete, cement mortar, masonry
Cement Backerboard
Exterior Plywood and OSB
Exterior Decks
Post-Tension Concrete
Lightweight Concrete
Gypsum-Based cement topping
Existing tile and resilient flooring
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For cracks up to 1/4” wide, you must fill the crack first with X-Bond mixture before applying the SEMCO Liquid Membrane™ over it.
For cracks wider than 1/4” or control joints, apply SEMCO Liquid Membrane™ first into the crack or control joint, fill it up and then apply another coat of SEMCO Liquid Membrane™ followed by fabric reinforcement and put a second coat of SEMCO Liquid Membrane™ over the fabric for maximum adhesion.
Application Instructions
HOW TO INSTALL SEMCO LIQUID MEMBRANE™
Brush
2 coats minimum
Sprayer Application
0.521 reversible tip | 2 coats minimum
Roller
1/2″ nap roller | 2 coats
Apply at temperatures from 50°F to 90°F
2 coats @ min total thickness 30mls wet
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HOW: Sweep debris off surface
PURPOSE: Ensure proper bond to substrate
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HOW: Use a 1/2″ nap roller. Allow any pre-treated areas to dry to the touch. Apply a generous coat of SEMCO Liquid Membrane™ with brush or roller over substrate including pre-treated areas. Apply another generous coat of SEMCO Liquid Membrane™ over the first coat of SEMCO Liquid Membrane™. Once you can walk on the surface and not get any residue on your shoe or feet or cannot leave a fingerprint impression it is ready to re-coat. Apply another thin coat of SEMCO Liquid Membrane™ in an alternate direction over the first coat of SEMCO Liquid Membrane™.
Let topcoat dry to the touch, approximately 1–2 hours at 70 °F (21 °C) and 50% RH. When last coat has dried to the touch, inspect final surface for pinholes, voids, thin spots or other defects. SEMCO Liquid Membrane™ will dry to bright orange color when it’s dry to touch. Use additional SEMCO Liquid Membrane™ to seal the defects. Required thickness is 30 mil
PURPOSE: Suitable of all sizes of installations, and ensures best performance of the SEMCO Liquid Membrane™
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HOW: The sprayer being used for the application of SEMCO Liquid Membrane™ should be capable of producing a minimum of 2,500 psi (17.2), maximum of 3,300 psi (22.8 MPa) with a flow rate of 0.95 to 1.6 GPM (3.6 to 6.0 LPM) using a 0.521 or a 0.631 reversible tip. Keep the unit filled with SEMCO Liquid Membrane™ to ensure continuous application of liquid. The hose length should not exceed 100’ (30 m) in length and 3/8” (9 mm) in diameter.
Required thickness is 30 mil
PURPOSE : Reserved for exceptionally large areas, and ensures best performance of the SEMCO Liquid Membrane™
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For clean up, use warm water to clean brush or roller right after use.
For optimal bonding we highly recommend preparing the surface as mentioned above for best results.
Stir up the product well before use in order to mix up the color pigments.
Avoid application in direct sun light in the afternoon or temperatures of over 85F as it might cause the product to dry too fast before it can adhere to the substrate
Before applying next coat, ensure RH is max. 25% on the surface
For applications where the product is fully submerged 3 coats @0.02 inch thickness per coat is required and allow a curing time of minimum 6-7 days. It is required to apply SEMCO Liquid Membrane™ in a continuous manner until above the water line. We do not recommend partial applications that are submerged.
Coverage may vary depending on porosity of the substrate and also the thickness of coat being applied.
For applications on fiberglass and metal, it is recommend to apply thinner coats (15mil thickness) in order for product to dry more evenly.
BASEMENT WATERPROOFING PROBLEMS
Basement waterproofing problems: with rain or from other sources such as irrigation or condensation, moisture can creep into your basement through your foundation walls or concrete ground slab.
Waterproofing failures can cause the following problems:
Mold, mildew, vegetative growth and odors
Stains and rust
Efflorescence and spalling of concrete or masonry that might eventually lead to serious structural concerns
Deterioration of carpet and wood rot
Delamination of existing wall and floor coverings
BASEMENT WATERPROOFING WITH SEMCO LIQUID MEMBRANE™
Reduces RH up to 75% / vapor transmission rate up to 10 PSI
SOLUTION: SEMCO LIQUID MEMBRANE™
SEMCO’s Liquid Membrane™ is a single component waterproofing and anti-fracture membrane. When combined with SEMCO’s X-Bond Seamless Stone, two-stage waterproofing is achieved, enabling single source protection.
BASEMENT WATERPROOFING WITH SEMCO LIQUID MEMBRANE™ + X-BOND
Reduces RH up to 90%, vapor transmission up to 20 PSI
Repair cracks up to 1/4” wide
Repair existing surface cracks and imperfections to ensure clean and smooth finish application.
* Drawing is not to scale
Repair control joints and cracks wider than 1/4”
Up to 400% stretch and elongation providing future crack suppression for years to come.
* Drawing is not to scale
Stabilization of deteriorating and crumbling surfaces
Apply X-Bond Liquid and Scratch Coat to the deteriorating and crumbling surfaces in order to solidify it.
* Drawing is not to scale
Specifications
COVERAGE
sq ft / gallon
Coverage may vary depending on porosity of the substrate
| Non submerged / Above Grade | 200-250 @ 2 coats (20ml each) |
| Submerged / Below Grade | 100 - 150 @ 3 coats (20ml each) |
PRODUCT INFORMATION
| Colour | Orange (other colors available on request) |
| Chemical type | Latex - cross-link hybrid |
| Clean up | SEMCO Stone Soap with water |
| Shelf life | 2 year in controlled environment (ambient temperature of 60ºF – 72ºF) |
| Packaging | 1 gal | 5 gal | 55 gal |
| Warranty | 5 year standard limited warranty, 10 year for non-traffic surfaces |
DRYING / RECOAT TIME
Drying times are affected by temperature and relative humidity. The chart represents guidline values but each project is to be treated individually.
The chart represents the time needed in between coats at specified temperature.
CURE TIME
Curing time is affected by temperature and humidity.
For example at only 50º F, a full cure would take 10 days in comparison to at 95º F it would only take 5 days to cure.
LABRATORY TEST RESULTS
| ANSI 118.10 – Breaking Strength ( ASTM D751, Procedure B ) | Pass |
| ANSI 118.10 – Dimensional Stability ( ASTM D1204 ) | Pass |
| ANSI 118.10 – 7-Day Shear Strength ( ASTM C482-9.8) | 173 PSI / shear |
| ANSI 118.10 – 7-Day Water Immersion Shear Strength | 132 PSI |
| ANSI 118.10 – 4-Week Shear Strength | 234 PSI |
| ASTM E96 – Water Vapor Transmission | 1.52 (g/hr-m2) |
| ASTM E96 -Water Vapor Transmission:Permeability | 0.135 (perm-in) |
| ISO 37 – Tensile Strength (ASTM D412):Maximum Stress | 453 PSI |
| ISO 37 – Tensile Strength (ASTM D412): Ultimate Elongation | 321% |
| ASTM D42370 – Tensile Strength:Maximum Stress | 184 PSI |
| ASTM D42370 – Tensile Strength: Ultimate Elongation. | 1300% |
| AS 4858.1 Appendix A: Elongation at Break | 1375% |
| AS 4858.1 Appendix A: Stability of Membrane Water Immersion | 588% |
| ASTM D42370 – Tensile Strength:Maximum Stress | 184 PSI |
| AS 3558.1: Water Absorption | 2.33% |
| AMTM004: Temperature Resistance | 2.7g/m2/24h |
| VOC Content | 14 g/L |
PRODUCT DATA SHEET
X-BOND OVER TILE DETAIL
OVER WOOD DETAIL
SAFETY DATA SHEET
STAIR DETAIL
CRACK & CONTROL JOINT DETAIL
TECH SHEET
DRAIN DETAIL
SHOWER DRAIN DETAIL
PREP TYPE E DETAIL
COVE BASE OVER CONCRETE DETAIL
POOL RESURFACING DETAIL
BASEMENT WATERPROOFING
COVE BASE OVER WOOD DETAIL
OVER CONCRETE DETAIL
BASEMENT WATERPROOFING WITH LIQUID MEMBRANE & X-BOND
OVER METAL DETAIL
OVER GYP-CRETE DETAIL