Sika Thoroseal 581 Grey 50lb Bag

Thoroseal 581 is a Portland cement-based coating for concrete and masonry that resists both air infiltration and positive as well as negative hydrostatic pressure. Creates a low maintenance and highly durable waterproof barrier.

Breathable
Protects from dampness and moisture damage
Compatible with coatings

$45.86

SKU

21448

Details

Sika Thoroseal 581 Grey - 50lb Bag

Sika Thoroseal 581 is a Portland cement based coating for concrete and masonry that resists air infiltration and both positive and negative hydrostatic pressure. Polymer modified with Sika Thoroseal Acryl 60, it is used to create a durable waterproof barrier for interior or exterior applications above or below grade.

Key Features

Portland cement based waterproof coating for concrete and masonry.
Air barrier performance to reduce air infiltration.
Resists positive and negative hydrostatic pressure.
Breathable coating that allows interior moisture to escape.
Compatible with many architectural coatings and textured finishes.
Certified to NSF/ANSI 61 for potable water contact.

Applications

Waterproofing basement walls and retaining walls.
Foundations above or below grade.
Bridges and tunnels on non traffic bearing surfaces.
Water cisterns and water treatment construction.
Interior and exterior vertical and light pedestrian horizontal surfaces.
Concrete and masonry flashing at rough openings.

Technical Specifications:

Property	Value
Chemical Base	Contains cement, graded sand, and proprietary additives
Packaging	50 lb (22.7 kg) polyethylene lined bags (standard gray)
Shelf Life	1 year when properly stored
Storage Conditions	Store in unopened containers in a clean, dry place protected from rain, dew, and humidity
Density	129 lbs/ft3 (2,080 kg/m3) when cured (Lab Method)
Compressive Strength (ASTM C109)	7 days: 4,200 psi (29 MPa); 28 days: 6,030 psi (42 MPa)
Flexural Strength (ASTM C348)	7 days: 360 psi (2.5 MPa); 28 days: 1,027 psi (7 MPa)
Tensile Strength (ASTM C190)	7 days: 250 psi (2 MPa); 28 days: 440 psi (3 MPa)
Water Penetration Under Pressure	Positive resistance to hydrostatic pressure: 752 hrs at 200 psi (CRD C 48, modified), no leakage, no softening
Water Penetration Under Negative Pressure	Negative resistance to hydrostatic pressure: 664 hrs at 200 psi (CRD C 48, modified), limited dampness
Permeability to Water Vapor	12 perms (ASTM E96)
Coverage	Base coat: 225 ft2 per 50 lb bag at 1/16 inch dry film; Topcoat: 450 ft2 per 50 lb bag at 1/32 inch dry film
Set Time	10 min at 70 F (21 C), 50% RH (Lab Method)
Final Set Time	90 min at 70 F (21 C), 50% RH (Lab Method)
Service Temperature	Immersion up to 140 F (60 C); cleaning water up to 200 F (93 C); dry air up to 220 F (104 C)

Frequently Asked Questions

Does Thoroseal 581 need to be modified with Acryl 60?
Yes. Thoroseal 581 must be modified with Sika Thoroseal Acryl 60 to achieve the properties listed in the technical data section.

Can it be used on the negative side of hydrostatic pressure?
Yes. It is resistant to both positive and negative hydrostatic pressure, which supports below grade interior and exterior waterproofing applications when conditions allow.

What substrates can it be applied to?
Typical substrates include cast in place and precast concrete, CMU block, brick, and porous stone when the surface is properly prepared and sound.

What coverage should I expect per 50 lb bag?
As a base coat at 1/16 inch dry film thickness, coverage is listed as 225 ft2 per 50 lb bag. As a topcoat at 1/32 inch dry film thickness, coverage is listed as 450 ft2 per 50 lb bag. Coverage varies with surface texture and porosity.

When can it be immersed in water service?
Allow the coating to cure for 7 to 10 days before immersion in water.

What temperature limits apply during installation?
Do not apply above 90 F (32 C) or below 40 F (4 C), or when temperatures are expected to fall below 40 F (4 C) within 24 hours.

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