VAPOR SEAL with PLASMATIC®
Provides the only true under-slab
vaporproofing and waterproofing.
SEALTIGHT PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE is a permanently
bonded, multi-ply, semi-flexible core board that has never been equaled or
surpassed for on-grade, below slab waterproofing or vaporproofing effectiveness.
It offers a WVT rating of 0.00 grains/ft.²/hr., the lowest in the industry.
Most importantly, the product will help meet and maintain the maximum slab
moisture transfer rate of 3 lbs./1,000 ft.²/24 hours, required by the flooring
PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE (PMPC) is a
permanently bonded multi-ply semi-flexible core board. The core consists of a
plasmatic matrix encased in 2 layers of pure-blown, high-meltpoint asphalt. The
three-ply core is sandwiched between liners of asphalt saturated felt and a
glass-mat liner. An asphalt weathercoat is applied to the glass-mat liner and
covered with a polyethylene anti-stick sheet.
PMPC provides a positive, easy-to-install, economical, true vaporproofing and
waterproofing system for horizontal applications. Properly applied, it stops
moisture migration in footings, concrete floors and structural slabs. PREMOULDED
MEMBRANE VAPOR SEAL with Plasmatic Core is both waterproof and vaporproof. It
offers a (WVT) water vapor transmission rating of 0.00 grains/ft.²/hr.*, the
lowest in the industry. The product is the ultimate when a true vapor seal is
required. Among its unique features is the built-in protection course which
resists job-site puncturing and the abrasive action of backfilling. The
exclusive PLASMATIC CORE adds ductility, flexibility, greater tensile strength
and excellent handling characteristics.
*As tested per ASTM E 96, Water Method.
SEALTIGHT PMPC, when properly applied, is designed to stop moisture
migration (liquid or vapor) in footings, concrete floor slabs and structural
slabs. It is especially useful under slabs overlaid with wood, tile, epoxy and
urethane coatings, carpeting and resilient or seamless flooring systems since it
helps prevent the warping and buckling caused by moisture migration.
Advantages and Benefits
|Offers a virtually impermeable vaporproofing system
with the lowest WVT rating available. It is both waterproof and vaporproof
|Installs directly over the tamped grade (no gravel fill
or sand needed)
|Offers ductility, flexibility, greater tensile strength
and excellent handling characteristics
|Provides the best available deterrent for warping,
buckling or delamination of subsequent flooring systems|
STOPS MOISTURE MIGRATION IN HORIZONTAL CONCRETE APPLICATIONS
The Ultimate Vapor Barrier to Eliminate Costly Moisture Damage
Over 80% of the moisture entering a structure originates in the site...it moves
from the grade into the structure both as a liquid (capillarity) and as a gas
The only effective way to eliminate the costly problems of excessive moisture
migration is to completely isolate the structure from the site during original
construction with the installation of a true vapor seal membrane that is both
waterproof and vaporproof. Material that is vaporproof is completely waterproof:
however, not everything that is waterproof is vaporproof. PREMOULDED MEMBRANE
VAPOR SEAL with PLASMATIC CORE is both waterproof and vaporproof.
While tremendously strong, even the best concrete is porous. Uncontrolled vapor
will move through it, causing dank musty smells...rust and condensation damage
to mechanical equipment..cracked plaster...chipped paint, efflorescence...warped
floors, etc. The installation of a true vapor seal under the concrete floor
slabs will stop moisture migration.
A true vapor seal must also be durable and tough enough to withstand normal
handling, foot traffic, aggregate impact and backfill abrasion. One tear, or a
few pinholes will destroy the entire purpose of the installation. Plastic films,
laminated film and paper combinations, reinforced building papers and saturated
roofing felts are semi-permeable at best, and will permit the passage of air
(vapor) through them. Additional information on the hydrologic cycle may be
found in W.R. Meadows Hydrologic Cycle. Manual available upon request.
SEALTIGHT PMPC offers the construction industry a positive, easy to install,
economical, true vapor-proofing system solution.
HORIZONTAL INSTALLATIONS – ON OR BELOW
GRADE: By installing PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE on the
ground prior to placing the concrete floor, moisture will be prevented from
coming through the floor slab.
ABOVE GRADE: By placing PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE on
the intermediate structural slab, moisture is prevented from filtering downward
from mechanical floors dedicated to heating and air conditioning equipment. This
prevents damage to lower floor levels.
HORIZONTAL APPLICATION: PREMOULDED MEMBRANE VAPOR SEAL with PLASMATIC CORE can
be applied directly over tamped grade, because it does not require a gravel bed,
a bed of sand and/or "crusher rock" prior to the installation of the
floor slab, although these practices are acceptable. PMPC works equally well
with either side up. However, in areas exposed to prolonged, direct sunlight we
recommend poly side up.
Material is placed in position by either the "Dutch Lap" method with
laps sealed with SEALTIGHT Catalytic Bonding Asphalt or by the
"Butt-Joint" method with joints sealed with SEALTIGHT Detail Strips.
These methods provide a permanent, monolithic vapor seal without voids or open
seams. If desired, on structural floor slabs of multi-level buildings, sheets
may be placed in a bed of hot asphalt for continuous adhesion.
THE "DUTCH LAP" METHOD: The "Dutch Lap" method of applying
PMPC on or below-grade horizontal areas. After removing the polyfilm at the
6" overlap areas, seal all laps with SEALTIGHT Catalytic Bonding Asphalt.
Pressure roll or "walk-in" all laps to assure complete adhesion.
THE "BUTT-JOINT" METHOD: The Butt-Joint method of applying PMPC: The
sheets are tightly butted together and "Butt-Joints" sealed with
SEALTIGHT Detail Strips. The Detail Strip is centered on the joints of the felt
side and rolled down with pressure for a positive seal.
When estimating the amount of PMPC required, figure the actual area
plus 20% for overlap when using sheets...for rolls, figure actual areas plus 12%
CUTTING: PREMOULDED MEMBRANE VAPOR SEAL can be cut with a roofer's
or linoleum knife using a straight edge.
BENDING: To facilitate bending at a change in plane such as at corners or
footings, lightly heat the board at the bending area.
STORAGE: Handling of PMPC is not critical because of its strength; however, it
is advisable to stack the material on smooth ground or a wood platform in
storage or at the excavation site. This will eliminate the possibility of the
PREMOULDED MEMBRANE sheets deforming or warping.
POINTING: Pointing with SEALTIGHT Pointing Mastic should be done wherever an
edge is exposed to prevent water from traveling under a sheet.
All protrusions through the concrete slab, such as sewer pipes,
water pipes and utility inlets, must have a positive seal between the protrusion
and the PREMOULDED MEMBRANE. Place a collar of PMPC at least 12" larger
than the protrusion around the protrusion. Seal in place with SEALTIGHT Detail
Strips and point around the protrusion with SEALTIGHT Pointing Mastic.
BONDING ADHESIVES: SEALTIGHT Catalytic Bonding Asphalt: A
non-setting bitumen that provides a seal that will expand and contract without
breaking bond. Use to seal horizontal joints and rebars between impaction sheets
on footing. Packaging: 5 gallon (18.93 liter) Pails
COVERAGE: 5 gallons per 1,000 ft.² of material.
SEALTIGHT PM-5X: A hard-setting bitumen offering strong initial tack, used to
adhere PREMOULDED MEMBRANE to vertical surfaces.
Packaging: 5 gallon (18.93 liter) Pails
SEALTIGHT Detail Strip: A sturdy, self-adhering, reinforced tape of polymeric
membrane that requires no additional adhesive. Provides a simple, easy and
economical method of effectively sealing horizontal and vertical butt joints.
Each strip is nominally 9" (.23m) wide and 50' (15.24m) long. Has
quick-strip release paper for ease of handling and application. Packaged 4 rolls
SEALTIGHT Pointing Mastic is used for sealing top horizontal terminations or
Packaging: 5 gallon (18.93 liter) Pails or 29 oz. (857.65 ml) Cartridges.
For full details, see Product Data Sheet No. 740-PD.
ft² (29.48 kg)
ft² (27.22 kg)
MSF of Membrane
|Catalytic Bonding Asphalt*
6" (152.4mm) laps
6" (152.4mm) laps
||40 gal. (151.4
lbs. (180-230 kg)
Strip Edge Terminations
|*Based on minimum of 1/16"
(1.59mm) film thickness
|**1/8"x 1"x 200 lineal feet
(3.18mm x 25.4mm x 60.96m)
Maintain Energy Efficiency
SEALTIGHT Products used in conjunction
with structural construction aid in the integrity of other structural systems
such as insulation. Because wet insulating materials lose much of their R factor
performance characteristics, this reduces the energy efficiency of the
structure. SEALTIGHT Products applied for thermal and moisture protection help
prevent moisture or vapor penetration into the other systems. These products
play a key role in maintaining the structure's energy efficiency.
PREMOULDED MEMBRANE VAPOR SEAL does not negate the need for relief
of hydrostatic heads. A complete drain tile system should be placed on the
exterior of the footing and, in severe cases, on the interior of the footing as
well. If applied to concrete surfaces... repair any spalled areas... fill all
voids and remove sharp protusions.
Adhesive coverage ratios must be adjusted to compensate for surface
irregularities and additional coats may be required to provide proper adhesion.
For maximum concrete performance and durability, the floor slab concrete design
should provide for the lowest possible slump and yet assure complete hydration
of the concrete. Refer to Material Safety Data Sheet for complete health and
This material last updated January, 2000.
W. R. MEADOWS, INC. warrants that, at the time and place
we make shipment, our materials will be of good quality and will conform with
our published specifications in force on the date of acceptance of the order.
THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY,
EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY
OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the
exclusive remedy for breach of this Warranty, we will replace defective
materials, provided, however, that the buyer examine the materials when received
and promptly notify us in writing of any defect before the materials are used or
incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has
shipped the materials, all our Warranty and other duties with respect to the
quality of the materials delivered shall conclusively be presumed to have been
satisfied, all liability therefore terminates, and no action for breach of any
such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event
be liable for consequential damages. Unless otherwise agreed to in writing, no
warranty is made with respect to materials not manufactured by W. R. MEADOWS,
INC. We cannot warranty or in any way guarantee any particular method of use or
application of the performance of materials under any particular condition.
Neither this Warranty nor our liability may be extended or amended by our
salesmen, distributors or representatives, or by our distributor's
representatives, or by any sales information or drawings.