In the evolution of roofing technology, PRIMO SA CAP, distributed by A1A Wholesale Supply, represents the “composite” generation of membranes. By utilizing differentiated waterproofing masses, PRIMO has created a sheet that optimizes each layer’s properties—combining a rugged upper weather barrier with an aggressively adhesive lower mass. This allows for a permanent bond to the substrate without the need for torches or hot asphalt, significantly reducing labor time and job site fire risk.
PRIMO SA CAP is uniquely suited for challenging substrates like OSB, wood decks, and sensitive insulation panels. Its white mineral slate surface not only protects the SBS compound from UV degradation but also contributes to a cooler roof surface. For intricate details, such as flashing around plastic pipes or skylights, the membrane remains flexible and easy to manipulate. While designed as a “peel-and-stick” product, it is versatile enough to be applied with hot air or open flame when traditional welding is required for specific architectural details.
Product Details
Manufacturer: PRIMO
Compound: Elastomer-Polymer Bitumen (SBS).
Reinforcement: Single Strand Composite Polyester.
Top Finish: White Mineral Slate (UV Protection & Aesthetics).
Lower Finish: Siliconized Release Film (Split longitudinally for easy removal).
Roll Dimensions: 10m x 1m (32.8′ x 3.28′).
Thickness: 3.3 mm (on mineral).
Certification: CE0958-UKCA012; EN 13707 compliant.
Features & Benefits
Safe Installation: Perfect for combustible substrates like wood or near heat-sensitive materials where open flames are prohibited.
High Wind Resistance: The full-surface adhesion creates a monolithic bond with the roof deck, providing superior resistance to wind uplift.
Composite Technology: Differentiated layers ensure the top stays weather-tough while the bottom stays “sticky” for maximum grip.
White Mineral Finish: Provides a clean aesthetic and reflects solar radiation to extend the life of the waterproofing assembly.
Refurbishment Specialist: The ideal choice for the restoration of historical roofs and complex geometries.
Application Guidelines
Surface Prep: Apply PRIMER SINT (200-400 g/m²) to cementitious surfaces or OSB. Standard wood decks typically do not require primer unless specified.
Positioning: Align the sheets with side laps of 10 cm and head laps of 15 cm.
Release: Remove the split-release film. For best results, use a heavy roller over the entire surface to activate the adhesive bond.
Mechanical Fastening: It is recommended to mechanically fix head and side laps, especially on slopes or vertical transitions.
Cold Weather: If temperatures are below +10°C (50°F), store rolls in a warm area and use a heat gun (Leister) to assist with adhesion during installation.
Recommendations
Slope: Ensure a minimum slope of 1.5% (concrete) or 3% (steel/wood) to prevent ponding water.
Verticals: Always mechanically fix the apex of the membrane on vertical walls using a termination bar or flashing.
Vapor Management: In high-humidity environments, use a PRIMO BASE vapor layer to prevent condensation buildup under the adhesive membrane.
Technical Specifications & Logistics
| Property | Value |
| Material Type | SBS Modified Composite Bitumen |
| Thickness | 3.3 mm |
| Roll Size | 10m x 1m |
| Weight | 3.3 kg/m² |
| Overlap (Side/Head) | 10 cm / 15 cm |
| Application Temp | Ideal above +10°C (50°F) |
