Siloxane WB Concentrate Water Repellent

Siloxane WB Concentrate – Long-Lasting, High-Performance Water Repellent for Masonry

Siloxane WB Concentrate is a penetrating water repellent designed for application to dense or porous masonry surfaces. It mixes easily with fresh water on the job site and chemically bonds deep within the masonry substrate to provide long-lasting protection against water-related staining and deterioration. This product is well-suited for contractors treating precast concrete in the field or at the plant, as well as any masonry surface requiring durable water repellency without a visible surface film.

Siloxane WB Concentrate is an effective alternative to conventional solvent-based silanes or siloxanes. Its water-based, concentrate formulation reduces solvent exposure on the job site while delivering the same deep-penetrating protection professionals expect. The product is compliant with all national, state, and district AIM VOC regulations, making it suitable for use across virtually any jurisdiction.

Technical Specifications

Key Features & Benefits

Deep Penetrating Protection

Siloxane WB Concentrate penetrates and chemically bonds deep within the masonry substrate rather than forming a surface film. This means protection is built into the material itself, providing long-lasting resistance to water-related staining and deterioration even under heavy weathering conditions.

High Dilution Ratio – Excellent Job Site Economy

One gallon of concentrate mixes with up to 19 parts fresh water, treating up to 4,000 square feet. For contractors managing material costs across large projects, this concentrate format delivers significant coverage from a compact, easy-to-transport volume.

Effective on Both Dense and Porous Masonry

Siloxane WB Concentrate performs on the full range of masonry surface types, from dense concrete to more porous substrates. This versatility allows contractors to standardize on a single water repellent product across diverse project conditions.

Works on Vertical and Horizontal Surfaces

The product penetrates effectively on both vertical and horizontal applications, giving contractors flexibility in how and where it is applied on a structure without requiring separate products for different orientations.

Bridges Existing Shrinkage Cracks

Siloxane WB Concentrate resists water penetration when applied over existing shrinkage cracks of 0.02 inches or less. This capability allows application to real-world masonry that may have minor cracking without requiring crack repair prior to treatment.

Compliant with All AIM VOC Regulations

The product is confirmed compliant with all national, state, and district AIM VOC regulations. Contractors working across multiple states or jurisdictions can use Siloxane WB Concentrate without managing separate VOC-compliant formulations by region.

Common Applications

Precast Concrete Treatment

Siloxane WB Concentrate is specifically noted as ideal for field or in-plant treatment of precast concrete, providing water repellency before or after installation.

Porous Masonry Water Repellency

Highly porous masonry surfaces that readily absorb water are well-suited candidates for Siloxane WB Concentrate, where deep penetration maximizes long-term protection.

Dense Masonry Water Repellency

The product is equally effective on dense masonry surfaces, making it applicable to a broad range of concrete and masonry construction types.

Vertical Masonry Facades

Its penetrating action works on vertical surfaces such as walls and facades, protecting against water-driven staining and deterioration common in exposed exterior applications.

Horizontal Masonry Surfaces

Horizontal surfaces such as flatwork, plazas, or horizontal precast elements benefit from Siloxane WB Concentrate's water repellency and resistance to water infiltration.

Compatible Materials

• Dense masonry surfaces
• Porous masonry surfaces
• Precast concrete (field or in-plant application)

Product Documents

• Product Data Sheet (English)
• Product Data Sheet (Spanish)
• Safety Data Sheet (English)
• Safety Data Sheet (Spanish)
• Safety Data Sheet (Canadian French)
• VOC Compliance
• LEED Verification Letter
• SCS Certification
• LBC Red List Verification

Frequently Asked Questions

Q: How is Siloxane WB Concentrate mixed for use?
A: The concentrate is mixed with fresh water on the job site. It can be diluted with up to 19 parts fresh water per part of concentrate.

Q: How much area does one gallon of concentrate cover?
A: One gallon of concentrate can treat up to 4,000 square feet. Coverage will vary by substrate; consult the Product Data Sheet for substrate-specific coverage rates.

Q: Is Siloxane WB Concentrate suitable for use in states with strict VOC regulations?
A: Yes. The product is compliant with all national, state, and district AIM VOC regulations.

Q: Will Siloxane WB Concentrate leave a visible coating or change the appearance of the surface?
A: No. Siloxane WB Concentrate is a penetrating treatment that chemically bonds within the substrate and leaves no visible film on the surface.

Q: Can Siloxane WB Concentrate be applied over existing cracks?
A: The product resists water penetration when applied over existing shrinkage cracks of 0.02 inches or less.

Q: What sizes is Siloxane WB Concentrate available in?
A: It is available in 1-gallon and 5-gallon sizes.