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Sika Thoroseal 581 Grey 50lb Bag
Sika Thoroseal-581 is a Portland cement waterproof coating for concrete and masonry in a gray 50 lb bag. Polymer-modified with Acryl 60, it resists positive and negative hydrostatic pressure above and below grade.
- Resists positive and negative hydrostatic pressure
- Air barrier cuts damp air infiltration
- NSF/ANSI 61 for potable water contact
$67.56
Sika Thoroseal-581
Sika Thoroseal-581 is a Portland cement coating for concrete and masonry that resists air infiltration and both positive and negative hydrostatic pressure. This gray 50 lb bag is polymer-modified with Sika Thoroseal Acryl 60 for a durable waterproof barrier on basement walls, foundations, cisterns, and tanks. Base-coat coverage is approximately 225 ft2 per bag at 1/16 in. The same coating is also sold as white.
Key Features
- Portland cement waterproof coating for concrete and masonry
- Resists positive and negative hydrostatic pressure
- Air barrier reduces damp air infiltration
- Breathable film lets interior moisture escape
- Polymer-modified with Sika Thoroseal Acryl 60
- NSF/ANSI 61 for potable water contact
Applications
- Basement and retaining walls above and below grade
- Foundations, cisterns, and tanks
- Interior and exterior concrete and masonry
- Cast-in-place and precast concrete, block, brick, and porous stone
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer | Sika |
| Product | Thoroseal-581 |
| Type | Portland cement waterproof coating |
| Color | Standard gray |
| Bag | 50 lb bag |
| Mixing liquid | Approximately 6 qt per bag (1.5 qt Acryl 60 + 4.5 qt water) |
| Pot life at 70 F | Approximately 60 to 90 minutes |
| Recoat | 24 hours |
| Base coat coverage | Approximately 225 ft2 at 1/16 in |
| Topcoat coverage | Approximately 450 ft2 at 1/32 in |
| NSF/ANSI | 61 potable water |
| MPN | 811775 |
Product documents: Sika Thoroseal-581 PDS (PDF)
Frequently Asked Questions
What surfaces is Sika Thoroseal-581 used on?
Concrete and masonry above and below grade, interior and exterior. Typical work includes basement and retaining walls, foundations, cisterns, tanks, bridges and tunnels on non-traffic surfaces, and flashing of rough openings in concrete or masonry.
What hydrostatic pressure does Sika Thoroseal-581 resist?
It resists both positive and negative hydrostatic pressure, so it can waterproof walls that see water from the wet side or the dry side of the structure.
What mixing liquid does Sika Thoroseal-581 need?
It is polymer-modified with Sika Thoroseal Acryl 60. The published mix is approximately 1.5 qt Acryl 60 plus 4.5 qt water, approximately 6 qt of liquid per 50 lb bag. Up to 2 additional quarts may be added when used as a rubbing compound.
What pot life does Sika Thoroseal-581 have at 70 F?
Approximately 60 to 90 minutes at 70 F. At high temperature and low humidity, pot life can be significantly shorter.
What coverage does a 50 lb bag of Sika Thoroseal-581 deliver?
Approximately 225 ft2 as a base coat at 1/16 in dry-film thickness, or approximately 450 ft2 as a topcoat at 1/32 in. Coverage varies with surface texture and porosity.
What potable-water listing does Sika Thoroseal-581 carry?
It is certified to NSF/ANSI Standard 61 for potable water contact. Allow 7 to 10 days of cure before immersion in water.
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