Joint & Seam Filler crack and joint filler sealant
Joint & Seam Filler is a high-performance, fiber-reinforced filler and transition treatment designed to seal gaps, cracks, and seams where flexible reinforcement is needed. This easy-to-apply, single-component silyl-terminated polymer (STP) offers superior long-term adhesion and durability. It bridges large gaps, eliminates the need for joint reinforcing tapes, and cures under wet or dry conditions, making it ideal for a variety of flashing and waterproofing systems.
Key Benefits of Joint & Seam Filler
- Eliminates the need for reinforcing tapes at sheathing joints and corners
- Solvent-free, phthalate-free, isocyanate-free and VOC-compliant
- Strong adhesion to damp or dry substrates
- Cures quickly even in wet weather and tolerates rain immediately
- Supports fluid-applied flashing, air barrier, and waterproofing systems
Common Applications
- Crack and joint treatment on commercial façades
- Transition detailing between dissimilar materials
- Surface preparation for fluid-applied air barriers
- Sealing large gaps at sheathing joints and inside/outside corners
Packaging & Usage
Available in 29 oz cartridges and 20 oz sausages. Coverage ranges from 38.5 to 93.5 lineal feet depending on packaging. Shelf life is 1 year in tightly sealed containers.
Product Properties
| Property | Value |
|---|---|
| Shelf Life | 1 year unopened |
| VOC Content | 30 g/L maximum |
| Form | Viscous paste, red color, mild odor |
| Coverage Rate | 60.5–93.5 lineal feet per 29 oz tube, 38.5–60.5 per 20 oz sausage |
| Total Solids | 99% |
| Available Sizes | 29 oz tubes, 20 oz sausages |
Joint & Seam Filler is often used alongside FastFlash for full air and water barrier continuity. For additional sealants, visit our Prosoco product catalog or explore prosoco.com.
