• Underslab Waterproofing Membranes

    Posted May 4th, 2011 By Brian Carrillo in More Featured Items With | No Comments
    Why Specify UNDERSEAL™ Underslab Waterproofing Geomembrane
    Over a Heavy Duty Vapor Barrier?
    If you already specify a thicker vapor barrier, you have taken a big step towards improved underslab moisture protection. Also importantly, you have recognized that much of what is called the Indoor Air Quality Problem can originate underneath the slab and outside of the foundation walls.Now there is a new level of underslab protection, far beyond a vapor barrier, and available for environmentally sensitive projects. UNDERSEAL™ Underslab Waterproofing Geomembrane is a three layer composite, made by combining a geomembrane, a sealant, and a geotextile fabric.

    Before viewing this page, we recommend that you see the “Why Most Vapor Barriers Fail” presentation.

    It’s Polyguard’s UNDERSEAL™ Underslab Waterproofing Geomembrane.

    Product Construction

    Layer 3 —
    High strength nonwoven geotextile
    Layer 2 —
    Thick elastomeric sealant barrier layer
    Layer 1 —
    20 mil Geomembrane
    Layer 1 – The Geomembrane:UNDERSEAL™ Underslab Waterproofing Geomembrane STARTS with a geomembrane – a 20 mil thickness one, thicker than any vapor barrier on the market.

    Layer 2 – The double thickness elastomeric sealant layer:

    On top of the geomembrane is a double thickness of sealant.

    The sealant converts geomembrane into a full blown waterproofing system, with properties exceeding that of Polyguard’s 650 waterproofing membrane, used for commercial building worldwide since 1970.


    • The formulation has been modified and tested as a seal against:
    1. Formosan Termites
    ICC-ES Legacy Report #2136
    2. Pesticides
    3. Radioactive Radon Gas
    4. Methane
    Also, the sealant is a permanent seal, proven in use by 34 years of research and use. Polyguard underseal membranes have been used by state Departments of Transportation to reduce cracking and to provide a permanent seal which is resistant to joint movement and pavement failure:

    • In research reported by the Pennsylvania, Georgia, Delaware, Michigan, Mississippi, and other DOTs the stress absorbing properties of Polyguard underseal have reduced the amount and severity of cracking in pavement above the underseal.


    • In research reported by Pennsylvania, New York, and Mississippi DOT’s, Polyguard underseal has maintained a permanent seal even after the pavement has cracked or the joint has moved above the underseal.
    One more advantage of this elastomeric sealant layer; it is self-healing. This means that, if small punctures occur in the underseal, the barrier sealant will flow back together.


    Layer 3 – High Strength Geotextile Fabric:

    The top fabric layer performs several functions:

    • The fabric layer resists construction traffic: By far the biggest reason for vapor barrier failure is damage by construction traffic. Polyguard’s highway underseal guide specifications say that the material “may be exposed to traffic for up to two weeks”. This means highway traffic. The Nevada DOT published a study reporting that Polyguard underseal had been exposed to over 1 million vehicles on US 395 “without undue wear and tear”.


    • The fabric layer forms a bond underneath the concrete slab: When the slab is poured, a mechanical bond is formed between the fibers in the UNDERSEAL™ Underslab Waterproofing Geomembrane and the concrete.

    Compared to a simple vapor barrier, Polyguard’s UNDERSEAL™ Underslab Waterproofing Geomembrane protected geomembrane has the following advantages:

    1. The thickness of the geomembrane exceeds even the best vapor barriers.
    2. The sealant layer creates a complete waterproofing membrane.
    3. Tested as a seal against termites, pesticides, radioactive radon gas, and methane.
    4. Reduces the amount and severity of cracks in the slab above.
    5. Proven to maintain a permanent seal, even after cracks occur in the slab, or joints in the slab shift.
    6. The sealant layer has self healing properties. Click here to view test results.
    7. Extreme durability to construction traffic.
    8. Forms a mechanical bond to the concrete slab.

    9. The puncture resistance of the
    UNDERSEAL™ Underslab Waterproofing Geomembrane Protected Geomembrane tests out at 316 lbs. (143,000 grams), exceeding class A vapor barrier requirements by 6500%. Click here to view puncture resistance test.

    View Complete Underseal Research List

    Compare to Grace Products

    Pre-applied Waterproofing Membranes

    Preprufe® Waterproofing System (Preprufe® 300R & 160R)
    Preprufe® 300R & 160R membranes are unique composite sheets comprising a thick HDPE film, an aggressive pressure-sensitive adhesive and a weather resistant protective coating.

    Unlike conventional non-adhering membranes, which are vulnerable to water ingress tracking between the unbonded membrane and structure, the unique Preprufe seal to concrete prevents any ingress or migration of water around the structure.

    The Preprufe R System includes:

    Preprufe 300R – heavy-duty grade for use below slabs and on rafts (i.e. mud slabs). Designed to accept the placing of heavy reinforcement using conventional concrete spacers.

    Preprufe 160R – thinner grade for lighter applications and reverse tanking (i.e. blindside zero property line) applications against permanent formwork such as soil retention systems.

    Preprufe Tape LT – for covering cut edges, roll ends, penetrations and detailing (temperatures between -4°C (25°F) and +30°C (86°F)).

    Preprufe Tape HC – as above for use in Hot Climates (minimum 10°C (50°F)).

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