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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NO. 720

SEALMASTIC™

SOLVENT DAMPPROOFINGS
Three dependable application grades to meet your specification requirements.

SEALTIGHT SEALMASTIC Dampproofing Coatings are available in 3 dependable application grades for spraying, brushing or troweling.

Technical Description
SEALMASTIC Solvent-Type Dampproofings are asbestos-free, fibered-asphalt compounds containing an exclusive wetting agent to convert a naturally hydrophobic surface to a hydrophilic surface to assure proper coating adhesion. Both the brush-on and trowel applied coatings are flexible and will span small holes and hairline cracks. All 3 grades withstand temperature changes and will not crack under normal expansion or contraction. The 3 types offered are:

SPRAY-MASTIC Dampproofing, a non-fibered asphalt compound for use where spray application is desired.

SEMI-MASTIC Dampproofing, a brush or spray-on fibered asphalt compound designed to protect exterior below-grade masonry walls.

TROWEL-MASTIC Dampproofing, a trowel-applied, heavy-bodied, fibered asphalt compoumd for exterior, below-grade masonry wall surface applications. It is recommended to protect porous or irregular surfaces.

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

Uses
SEALMASTIC Solvent Type Dampproofing Coatings are ideal for reducing dampness and moisture infiltration through foundation walls, footings, retaining walls, parapets, fire walls, tanks, culverts, cisterns and bridge abutments. They are also applicable for stone-backing, above-grade cavity wall applications and below-grade masonry wall dampproofing.

Features and Benefits

Application
MIXING: For Spray-Mastic or Semi-Mastic, stir the contents in the container thoroughly prior to applying with a soft bristle brush or suitable spray equipment. When applying Spray-On Dampproofings, use a Graco 9:1 ratio pump or equal, capable of delivering 3 to 5 gallons per minute (11.36 liters to 18.93 liters), and a Polegun with a 1/8" (3.18mm) to 1/4" (6.35mm) tip. A 3/4" I.D. (19.05mm) material hose and a 1/2" I.D. air hose from the pump to the gun is recommended for most applications. Apply SEALMASTIC Dampproofings to clean, dry surfaces at temperatures above 40ºF (4ºC). Apply in a continuous, unbroken film, free of pinholes and over any exposed footings, slots or grooves, etc.

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.

SURFACE PREPARATION: All surfaces to be coated must be thoroughly cleaned of all scale, loose mortar, rust, dirt, oil, grease and other foreign matter. Use a wire brush, sandblast or other methods in keeping with good construction practices. Before product application, fill voids, cracks and holes in concrete with cement mortar and allow to dry. Dusty or porous masonry must be primed with asphalt primer and allowed to dry thoroughly before applying dampproofings.
Do not apply when the temperatures below 35ºF (2ºC) are anticipated. Do not apply in rain or when rain is threatening. For added protection against backfilling damage, install SEALTIGHT PROTECTION COURSE after the damproofing has dried. Backfill immediately. SEALMASTIC Damproofings should not be used in areas subjected to prolonged exposure to sunlight.

POROUS SURFACES, i.e. concrete block:

DENSE CONCRETE SURFACES:

Semi-Mastic

Trowel-Mastic

* All coverage rates are based on wet film thickness.

This material last updated October, 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.

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