WHY LIQUID MEMBRANE?

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, The Founder

The SEMCO Liquid Membrane is a single component water-based 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

SUBSTRATES

  • Concrete
  • Plywood
  • Stone
  • Exterior/interior cladding
  • Residential, industrial and commercial

COVERAGE

sq ft / gallon, 2 coats

Open pore substrates25 – 50
Closed pore substrates35- 65
X-Bond Scratch Coat100 – 150

Waterproof Everything, Adhere to Everything, SEMCO Liquid Membrane Everything

Integrated chemical adhesion enables mechanical cross-linking to the applied surfaces, creating a perfect bond for long lasting protection.

→ SEE ACTIVE ADHESION IN ACTION

Low VOC waterproofing that allows you to proceed with your finish within 2 hours of application enabling a speedier project completion.

→ SEE HOW WATERPROOFING IS DONE

Up to 400% stretch and elongation providing future crack suppression for years to come. Stabilizes wood substrates to receive surface finish products.

→ SEE HOW TO REPAIR CRACKS AND CONTROL JOINTS

FEATURED PROJECTS

APPLICATION

Roller
2 coats

Paint brush
2 coats minimum

Apply at temperatures from 50°F to 90°F

Waterproofing concrete and wood substrates

Liquid Membrane is the perfect self adhering Membrane for waterproofing concrete and wood substrates. Use it for your shower, fountain, pool interior and protect it from long term water or moisture damage

* Drawing is not to scale

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 existing substrates

Repair existing surface cracks and imperfections to ensure clean and smooth finish application.

* Drawing is not to scale

SPECIFICATIONS

ColorOrange (other colors available on request)
Chemical typeLatex – cross-link hybrid
Clean upSEMCO Stone Soap with water
Shelf life2 year in controlled environment (ambient temperature of 60ºF – 72ºF)
Packaging1 gal | 5 gal | 55 gal
Warranty5 year standard limited warranty, 10 year for non-traffic surfaces

DRYING / RECOAT TIME

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.

LABORATORY 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 Strength132 PSI
ANSI 118.10 – 4-Week Shear Strength234 PSI
ASTM E96 – Water Vapor Transmission1.52 (g/hr-m2)
ASTM E96 -Water Vapor Transmission : Permeability0.135 (perm-in)
ISO 37 – Tensile Strength ( ASTM D412 ) : Maximum Stress453 PSI
ISO 37 – Tensile Strength ( ASTM D412 ) : Ultimate Elongation321 %
ASTM D42370 – Tensile Strength: Maximum Stress184 PSI
ASTM D42370 – Tensile Strength: Ultimate Elongation. → WATCH VIDEO520%

FAQ – Frequently Asked Questions

What is Liquid Membrane?

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.

What are the key benefits of Liquid Membrane?
  • 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
  • 400 % 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
How can Liquid Membrane be applied?

SEMCO Liquid Membrane can be applied with a paintbrush or roller on to the surface. 2 coats are required for optimal performance.

What is Liquid Membrane used for?

Liquid Membrane is the perfect self adhering Membrane for waterproofing concrete and wood substrates. Use it for your shower, fountain, pool interior and protect it from long term water or moisture damage.

Which substrates are suitable for Liquid Membrane?
  • 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
Are there any laboratory test results for Liquid Membrane?

Yes. Liquid Membrane has undergone the following tests:

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

390 PSI

ISO 37 – Tensile Strength ( ASTM D412 ) : Ultimate Elongation

400%

How can I bridge cracks with Liquid Membrane?

For cracks up to 1/4” wide you must fill the crack first with X-Bond mixture before applying the Liquid Membrane over it.

For cracks wider than 1/4” or control joints, apply Liquid Membrane first into the crack or control joint, fill it up and then apply another coat of Liquid Membrane followed by fabric reinforcement and put a second coat of Liquid Membrane over the fabric for maximum adhesion.

Does the surface has to be cleaned before using Liquid Membrane?

Yes! The surface of the pool shell must be clean. This step is often overlooked and can lead to problems. The first step is to remove any surface contamination left from the placement of the concrete such as form release agents, laitance (the weak, powdery cement fines which can appear on the surface of a poured, vibrated concrete wall), dust, dirt, oil, paint, concrete sealers, and curing compounds or any other material that can act as a bond inhibitor.

What is the coverage of Liquid Membrane?

sq ft/gallon @ 2 coats

Open pore substrates

25 – 50

Closed pore substrates

35 – 65

X-Bond Scratch Coat

100 – 150

PRODUCT DATA SHEET, SAFETY DATA SHEET AND ARCHITECTURAL DETAILS

REQUEST LIQUID MEMBRANE SAMPLE KIT

Just fill out the form bellow and SEMCO will happily send you the Liquid Membrane Sample Kit at no charge. We know you will be impressed!