R-Guard® Joint & Seam Filler
Short Description
R-Guard® Joint & Seam Filler is a high-performance, gun-grade crack and joint filler designed to seal sheathing joints, seams, and fastener heads as part of an air and water-resistive barrier system. This fiber-reinforced, Silyl-Terminated-Polymer (STP) compound bonds to damp or dry surfaces, eliminating the need for joint reinforcing tapes. Flexible, weather-resistant, and VOC-compliant, it ensures long-term air and moisture protection for commercial and residential buildings.
R-Guard® Joint & Seam Filler is a single-component, high-performance joint filler, adhesive, and detailing compound formulated to bridge gaps, seal sheathing joints, and prepare surfaces for air and water-resistive barriers. Combining the best properties of silicone and polyurethane, this fiber-reinforced, Silyl-Terminated-Polymer (STP) formula offers superior adhesion, crack bridging, and flexibility in all climates.
Ideal for commercial and residential construction, Joint & Seam Filler bonds directly to damp or dry surfaces, allowing for fast, tape-free installation and reducing preparation time. It provides seamless integration with fluid-applied flashing membranes, waterproofing, and air barrier components, ensuring continuous building-wide protection against air and water infiltration.
Key Benefits of R-Guard® Joint & Seam Filler:
- Eliminates the need for joint reinforcing tapes—reduces labor and material costs
- Flexible and fiber-reinforced—bridges gaps and cracks up to 1 inch
- Superior adhesion—bonds directly to damp or dry surfaces without priming
- Compatible with most air and waterproofing systems—seamless integration with R-Guard® FastFlash®, Spray Wrap MVP, and Cat 5
- Weather-resistant and UV-stable—remains exposed for up to 12 months before final covering
- Breathable and vapor-permeable—prevents trapped moisture and mold growth
- Solvent-free, isocyanate-free, and phthalate-free—safe for workers and environmentally compliant
- Fast curing—paintable within 2 hours and fully cured in 4 hours
Common Applications:
- Sealing sheathing joints, seams, and fastener heads
- Bridging gaps and cracks in exterior walls
- Detailing penetrations and transitions in air and moisture barrier systems
- Preparation for PROSOCO R-Guard® fluid-applied waterproofing
- Commercial and residential air barrier installations
💡 Available in 29-oz tubes and 20-oz sausages. Coverage varies based on joint size and surface texture.
