Waterproofing Guidelines

WATERPROOFING AND TEST COMPLIANCE SUMMARY

Responsibility & Warranty

CSI Architectural Metal LLC is not responsible for waterproofing unless a formal CSI 20-Year Weather-Tightness Warranty is issued. This warranty is provided only when CSI’s tested waterproof assemblies are used in accordance with the specifications validated by Intertek Building & Construction.

Tested and Approved Waterproof Assemblies

CSI recommends the Platinum HT-B Weather Barrier as the standard high-performance membrane for roof, wall, soffit, fascia, and custom assemblies. When field adhesion is reduced due to temperature or moisture, the Perm-A-Barrier water-based primer must be applied prior to installation.

Low-Slope Applications (< 2:12 Pitch)

For roof slopes below 2:12, CSI requires two layers of fully adhered high-temperature peel-and-stick underlayment installed over Perm-A-Barrier primer. Flashings must be sandwiched into the membrane at all perimeters and penetrations. This underlayment assembly serves as the primary

waterproofing system, while the metal panels function as an architectural rainscreen and UV barrier.

Underlayment Assembly Details

• System Type: High-Temperature Ice & Water Shield Assembly • Membrane: Two layers of self-adhered underlayment applied over Perm-A-Barrier primer • Integration: Flashings embedded between underlayment layers create a continuous waterproof envelope • Limitation: Metal roof coverings must still comply with slope requirements.

Underlayment redundancy cannot substitute for slope-compliant panel design. • Reference: CSI has a 20-year track record of successful custom installations using GRACE ULTRA membranes and Perm-A-Barrier primer, warranted by Grace Construction Products in conjunction with CSI.

Protection Against UV Degeneration

To prevent UV degradation of waterproofing membranes in assemblies with perforated or open-joint systems—such as CSI Applied Heavy Plate (CSI-AHP) Soffit Panel Systems and CSI-AHP Wall Systems—CSI requires the installation of a Dörken DELTA®-FASSADE

S UV Barrier Layer directly over the waterproofing membrane. This protective layer shields the primary barrier from prolonged UV exposure while maintaining drainage and ventilation continuity behind the panels.

Recognized Use in Rainscreen Conditions

CSI Architectural Metal LLC recognizes use of its roof panels at low slopes (1:12 and below) where they act as rainscreen and UV barrier only, provided the above double-layer underlayment assembly is followed exactly. In these installations, CSI panels are approved for architectural use with full aesthetic and structural integrity, while waterproofing remains the responsibility of the underlayment system.

Validated Performance

According to Intertek Test Report No. Q6264.02-450-18 R0, dated 08/14/2024, CSI’s 1/8" Aluminum 1100 Roof Panel assembly (with Platinum HT-B Weather Barrier) successfully passed the TAS 100-23 Wind Driven Rain Resistance Test, meeting the requirements of Florida Building Code 8th Edition (2023), Section 1523.6.5.

Test Highlights

• Test Agency: Intertek Building & Construction – West Palm Beach, FL • Test Method: TAS 100-23 (Wind and Wind-Driven Rain Resistance) • Panel Type: 1/8" Aluminum 1100 Roof Panel, 2:12 slope • Underlayment Used: Platinum HT-B Weather Barrier (single layer, 3" overlap) • Observed Results: - 35 mph – No leakage - 70 mph – No leakage - 90 mph – No leakage - 110 mph – No leakage • Conclusion: The assembly met or exceeded FBC TAS 100 performance criteria.

Warranty Integration

CSI Architectural Metal LLC will issue a Weather-Tightness Warranty only in conjunction with the waterproofing manufacturer’s warranty when the above assemblies, membranes, primers, and UV protection layers are installed according to tested and approved procedures. 

Report Reference: Intertek Q6264.02-450-18 R0 | 

Date: 09/15/2024 | © CSI Architectural Metal LLC