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No. 721

Specification

SEALMASTIC™ EMULSION

DAMPPROOFING

DESCRIPTION
SEALMASTIC emulsion-type dampproofing is a breather-type which permits moisture vapor to escape through the film, while remaining resistant to water penetration. This prevents blistering of applied films. The product can be applied to green concrete (not totally dry).

TYPE I (spray-grade) is an asphalt-based, non-fibered, clay emulsion. Under normal use, it resists flow or sag. Its greater resistance to water is ideal where spray application is desired.

TYPE II (brush-on/spray-grade) is an asphalt-based, clay emulsion with fibers specifically formulated to offer a tight film that combines both excellent strength and resistance to water.

TYPE III (trowel-on grade) is a trowel-applied mineral colloid, asphalt emulsion, fibrated with selected fibers and produced in an ideal, light trowel application consistency. TYPE III offers high weather, water, corrosion and abrasion resistance. It can be used as an adhesive on foam board installations.

All SEALMASTIC products meet VOC content limits of 500 g/L for bituminous coatings and mastics as required by the U.S. EPA Architectural Coatings Rule.

USES
SEALMASTIC emulsion-type dampproofing coatings are ideal for reducing dampness and moisture infiltration through foundation walls, parapets, firewalls, tanks, culverts, cisterns and bridge abutments. They are also applicable for stone-backing, above-grade cavity wall applications and below-grade masonry wall dampproofing. The SEALMASTIC product line also helps to minimize internal structural damage from mildew and mold.

COVERAGE*
TYPE I
Above grade surfaces: Approximately 70-100 ft.²/gal. (1.71 to 2.45 m²/L) per coat.

TYPE II & TYPE III
Exterior below-grade dense surfaces, exterior below-grade porous surfaces, interior above-grade surfaces:

(One coat, 1/8" wet film thickness): Approximately 10-12.5 ft.²/gal. (0.25 to 0.3 m²/L).

(One coat, 1/16" wet film thickness): Approximately 20-25 ft.²/gal. (0.5-0.6 m²/L).

*Coverage may vary due to porosity and condition of concrete.

APPLICATION
Surface Preparation...All surfaces to be coated must be thoroughly cleaned of all scale, loose mortar, dust, rust, dirt, oil, grease and other foreign matter. Use a wire brush, sandblast or other method in keeping with good construction practices. Before product application, fill voids, cracks and holes in concrete with cement mortar and allow to dry. If primer is required, use SEALMASTIC SPRAY-MASTIC™ from W. R. MEADOWS. Do not apply when temperatures below 35° F (2° C) are anticipated. Do not apply in rain or when rain is threatening.

Mixing...TYPE I (spray-grade) and TYPE II (brush- or spray-grade) should be thoroughly stirred in their respective containers prior to application. TYPE III (trowel-grade) can be applied directly from the container.

EXTERIOR BELOW-GRADE DENSE SURFACES
Apply TYPE II (brush- or spray-grade) by soft bristle brush or suitable spray equipment* or TYPE III by trowel.

Dampproofing should be applied to properly prepared surfaces in a continuous, unbroken film, free of pinholes, filling and spreading around all joints, slots and grooves and penetrating into all crevices, chases, reveals, soffits and corners. Carry coating over the exposed footing’s top and outside edge, up to finished grade.

NOTE: Fillers, extenders and additives in concrete mixes can produce a higher than normal porosity and, as a result, additional coverage coats may be required.

EXTERIOR BELOW-GRADE POROUS SURFACES (3 OPTIONS)
1. Membrane System: For severe conditions or for added protection, apply one coat of TYPE II (brush- or spray-grade) or TYPE III (trowel-grade). Within four hours, apply a glass fabric membrane cloth over all coating surfaces. Overlap all edges 3” (76 mm) minimum. Press firmly into place without wrinkles. Application of second coat of TYPE II or TYPE III should be within 24 hours.

2. Two-Coat System: Apply SEALMASTIC SPRAY-MASTIC as a prime coat. Allow coat to dry tacky to touch and then apply TYPE III in one coat, as described under Dense Surface Application.

3. Parge-Coat System: Before application of SEALMASTIC, a parge-coat of cement mortar should be applied to the block wall. This coat should cover the bottom of the footings to grade level, forming a cove at the junction of the wall and footing. Once the parge-coat cures, apply one trowel-coat of TYPE III or two spray or brush coats of TYPE II, as described under Dense Surface Application.

BACKFILLING
Backfilling should be done within 24 to 48 hours after application. No longer than seven days maximum should elapse. Be careful not to damage or rupture the film or displace coating or membranes. To assure maximum protection, PROTECTION COURSE from W. R. MEADOWS should be used. Prolonged exposure to ultraviolet light should be minimized.

INTERIOR ABOVE-GRADE SURFACES-VAPOR RETARDER
TYPE I (spray-grade), TYPE II (brush- or spray-grade) and TYPE III (trowel-grade) can be used individually or in combination for dampproofing the exterior face of interior walls in cavity wall construction.

Cleanup ....While still wet, material may be removed with soap and water. Once dried, the material can be removed with kerosene or petroleum naptha. Solvent manufacturer precautions should be adhered to when using a solvent for clean up.

PRECAUTIONS
Keep from freezing in the original container. Not intended as a waterproofing membrane. (Refer to MEL-ROL® or MEL-ROL LM.) Read and follow application information and precautions. Refer to Material Safety Data Sheet for complete health and safety information.

This material last updated November 2007.