O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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Sealtight Premoulded Membrane




NO. 711



Technical Description
SEALTIGHT PREMOULDED MEMBRANE VAPOR SEAL provides a positive, easy-to-install and economical vaporproofing system. When properly applied, it will stop moisture migration through foundation walls and footings...concrete floor slabs and structural slabs. PREMOULDED MEMBRANE VAPOR SEAL also provides a "built-in" protection course to resist job-site puncturing and the abrasive action of backfilling.

PREMOULDED MEMBRANE VAPOR SEAL is a permanently bonded multi-ply core board of pure blown, mineral fortified, highmelt asphalt between layers of saturated felt and glass mat. The glass mat liner is weather coated and has an anti-stick facing sheet of polyethylene film. Supplied in 4' (1.22m) by 8' (2.44m) panels. Material weighs approximately 65 lbs. per 100 ft.˛ (3.17 kg./m˛).

PREMOULDED MEMBRANE VAPOR SEAL has a constant water vapor transmission rate not greater than 0.00 grains per square foot per hour, as measured in accordance with ASTM Test Method E-96, both before and after alternate cycles of wetting and drying.

Trained workmen, experienced in good waterproofing practices, will quickly and easily install PREMOULDED MEMBRANE on below-grade exterior walls and on-grade under concrete floor slabs to provide areas that can be fully utilized without moisture problems. Proper application also prevents moisture filtration through intermediate structural floor slabs – either downward, such as from a kitchen, or upward from a shower room or garage area. Protects equipment rooms from moisture damage. To relieve hydrostatic pressure, a complete drain tile system should also be used in accordance with good construction practices.

Advantages and Benefits

bulletStops adhesive deterioration
bulletEliminates bumps, ridges, or bubbles
bulletPrevents color changes
bulletDoes not promote mold, mildew or bacteria growth
bulletProvides a barrier, sealing out efflorescence (alkali build-up at tile joints)
bulletHelps eliminate tile peaking or curling
bulletMaterial is strong, rugged and easy to handle
bulletHas flexural strength and resistance to withstand impacts and abrasions
bulletImpermeable – WVT rating of 0.00 grains/hour/square feet
bulletStops moisture migration – its positive joint-sealing method helps form a monolithic VAPOR SEAL
bulletPays for itself over the years through reduced maintenance

BONDING AGENTS: 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 or footing. Packaging: 5 gallon (18.93 liter) pails.

SEALTIGHT PM-5X: A quick-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. Strip is nominally 9" (.23 m) wide and 50' (15.24 m) long. Has quick-strip release paper for ease of handling and application. Packaged 4 rolls per carton.

SEALTIGHT Pointing Mastic is used for sealing "butt-joints" and top horizontal terminations.

5 gallon (18.93 liter) Pails or 29 ounce (857.65 ml) Cartridges.

Catalytic Bonding
Hot-Mop Asphalt*
Detail Strips
Pointing Mastic**

Sheets: 6" laps
Sheets Only
Detail Strip
Edge Termin.
MEMBRANE (Approx.)

.5 gal.(1.89 liters)

4 gallons (15.14 liters)
40-50 lbs. (18-23 kg)
41.6 linear ft. (12.68 meters)
200 lineal ft./gal.
 *Based on minimum of 1/16" (1.59mm) film thickness
** 1/8" x 1" x 200 lf (3.18mm x 25.4mm x 60.96m)

Handling of PREMOULDED MEMBRANE is not critical because of its strength; however, it is advisable to stack the membrane on smooth ground or a wood platform at the excavation site. This will eliminate the possibility of the PREMOULDED MEMBRANE sheets warping or deforming. Specifier and user shall determine suitability of product for specific applications and assume all responsibilities in connection therewith.

HORIZONTAL APPLICATION: PREMOULDED MEMBRANE VAPOR SEAL can be applied directly over tamped grade, because it does not require a gravel bed, a bed of sand and/or "crusher run" prior to the installation of the floor slab, although these practices are acceptable. The polyfilm side of the board is placed down to the grade with the felt side up to the concrete.

Material is placed in position in 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 building, sheets may be placed in a bed of hot asphalt for continuous adhesion.

"DUTCH LAP" METHOD: The "Dutch Lap" method of applying PREMOULDED MEMBRANE on below or above-grade horizontal floor slabs. After removing the polyfilm at the overlap, seal all laps with SEALTIGHT Catalytic Bonding Asphalt. Roll with pressure or "walk-in" all slabs to assure complete adhesion.

"BUTT-JOINT" METHOD: The "Butt-Joint" method of applying PREMOULDED MEMBRANE: The sheets are tightly butted together and sealed with SEALTIGHT Detail Strips. The Detail Strip is centered on the joint of the felt side and rolled down with pressure for a positive seal.

ESTIMATING: When estimating the amount of PREMOULDED MEMBRANE VAPOR SEAL required, figure the actual area plus 20% for overlap when using sheets. For rolls, figure actual areas plus 12% for overlap.

Handling Suggestions
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 PREMOULDED MEMBRANE VAPOR SEAL is not critical because of its strength; however, it is advisable to stack the material on smooth ground or a wood platform 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.

SEALING PROCEDURES: All protrusions which go 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 PREMOULDED MEMBRANE at least 12" larger than the protrusion around the protrusion. Seal in place with SEALTIGHT Pointing Mastic and point around the protrusion.

PREMOULDED MEMBRANE VAPOR SEAL is packaged in sheets 48" (1.22 m) wide x 8' (2.44m) long.

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.

The current use of increased amounts of various fillers, extenders or additives in the concrete mix can result in the concrete having a higher than normal porosity. Adhesive coverage ratios must be adjusted to compensate for resulting penetration and additional coats may be required to provide proper surface treatment. The concrete mix design for the floor slab should provide for the lowest possible slump and yet assure complete hydration of the concrete.

BACKFILLING: While PREMOULDED MEMBRANE VAPOR SEAL is strong enough so that a protection course is not required, when backfilling, care should be taken not to disrupt the bond of the membrane to the walls. Be sure that the backfill material is not dropped against the membrane in such a manner that it could drag the sheet as it drops or dislodge the Detail Strips.

See product labels and Material Safety Data Sheets for additional information.

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.

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Copyright © 2002 O'Brill Company
Last modified: August 09, 2004