Utility Moisture Flash 12" x 120' Roll - Pallet of 20

Tamlyn UMF12 Utility Moisture Flash — Heavy-Duty Nail-On Flashing for Windows, Doors, and Wall Bases

The Tamlyn UMF12 Utility Moisture Flash is a heavy-duty, flexible, tear-resistant woven polypropylene nail-on flashing engineered to block moisture and water infiltration at the base of walls and around window and door openings. Designed for professional installation on residential and commercial construction projects, it integrates seamlessly with weather-resistive barrier (WRB) systems and meets ASTM E2112-01 requirements for the installation of exterior windows and doors. The cross-woven construction is mechanically fastened using staples or capped nails, ensuring a secure, reliable attachment to sheathing substrates.

Unlike standard housewrap-based flashing solutions, the UMF12 is purpose-engineered for high-stress transition zones where moisture management is critical. Its woven polypropylene construction resists cracking, delamination, and shrinkage over time — failure modes common in cheaper flashing materials — while maintaining flexibility for fast field installation. UV resistance up to 365 days allows extended exposure during construction phases without degradation of performance.

Key Features & Benefits

Excellent Moisture Resistance

Rated for up to 140 hours at 100% relative humidity, the UMF12 provides a robust barrier against bulk water intrusion at the most vulnerable transitions in the wall assembly. For contractors working in wet climates or on projects with extended framing exposure, this performance level provides a reliable buffer against early water damage.

Wind and Tear Resistance

The cross-woven polypropylene construction delivers high resistance to tearing and wind uplift during and after installation. This is critical at wall bases and rough openings where flashing is exposed to mechanical stress during framing, window setting, and exterior cladding installation.

UV Resistant Up to 365 Days

The UMF12 maintains its structural integrity and moisture-blocking performance for up to one full year of UV exposure. This provides significant scheduling flexibility on phased projects where exterior cladding may be delayed after rough-in completion.

Mold and Mildew Resistant

The material composition actively resists mold and mildew growth, reducing the risk of long-term biological degradation within the wall assembly. This is especially relevant in humid climates or on projects where the WRB and flashing may be enclosed before the structure is fully dried in.

Will Not Delaminate or Shrink

Unlike laminated or felt-based flashing products, the UMF12 maintains dimensional stability over time and will not separate or pull back from fastened edges. This ensures the flashing continues to perform as designed throughout the life of the building envelope.

Fast and Flexible Installation

The flexible woven construction allows the material to conform to irregular surfaces and complex rough opening geometries without wrinkling or bridging. Mechanical fastening with staples or capped nails means no adhesive curing time, keeping installation moving on production schedules.

Easy WRB Integration

The UMF12 is specifically designed to integrate with weather-resistive barrier systems, allowing installers to maintain a continuous, lapped moisture management plane from the flashing to the field WRB. This compatibility reduces detailing complexity and potential failure points at transitions.

Common Applications

Window Rough Opening Flashing

The UMF12 installs at the sill and jambs of window rough openings to redirect any incidental water that bypasses the window unit back to the exterior. Its approval per ASTM E2112-01 makes it a code-compliant choice for this critical detail.

Door Rough Opening Flashing

Applied at the base and sides of exterior door rough openings, the UMF12 prevents moisture from tracking into the wall cavity behind the door frame — a common source of rot and structural damage in wood-framed construction.

Wall Base Flashing

Installed at the base of exterior walls above foundation ledges or brick ledges, the UMF12 captures and redirects water that migrates down through the wall assembly before it can enter the structure or accumulate at the sill plate.

Brick Ledge Transitions

As shown in the product installation diagram, the UMF12 is suitable for use at brick ledge transitions where moisture management between the WRB and masonry veneer is required. Its durability under long-term exposure makes it appropriate for this concealed application.

Weather-Resistive Barrier System Integration

When used as part of a complete Tamlyn water management system alongside TamlynWrap Drainable Wrap and XtremeFlashing accessories, the UMF12 contributes to a fully lapped and detailed moisture management assembly eligible for Tamlyn's extended warranty program.

Compatible Materials

• OSB sheathing
• Insulation board / rigid foam sheathing
• Plywood sheathing
• Weather-resistive barriers (WRB)
• TamlynWrap Drainable Wrap systems
• Exterior window and door frames (per ASTM E2112-01)
• Brick veneer and masonry cladding systems
• Wood-framed wall assemblies
• Light gauge steel framing assemblies

Product Documents

• Catalog Page
• Product Brochure
• MSDS File

Application Instructions

Surface Preparation

1. Verify sheathing surface is clean, dry, and free of protrusions that could puncture or bridge the flashing material.
2. Confirm rough openings are properly sized and framed per applicable building codes and window/door manufacturer requirements.
3. Review project specifications for required lapping sequence with the specified WRB system.

Installation at Window and Door Openings

1. Install sill flashing first, extending the UMF12 across the full width of the rough opening sill and lapping onto the sheathing a minimum distance per project specifications or ASTM E2112-01 requirements.
2. Mechanically fasten with staples or capped nails along the top edge and field as required. Cap fasteners are required throughout per warranty terms.
3. Install jamb flashing on each side of the rough opening, lapping over the sill flashing at the corners.
4. Install WRB over the jamb flashing flanges, maintaining the proper shingle-lap sequence to direct water to the exterior.
5. Set the window or door unit into the flashed opening per manufacturer instructions.

Installation at Wall Base and Brick Ledge

1. Position UMF12 along the base of the wall above the foundation ledge or brick ledge, ensuring full coverage of the transition zone.
2. Mechanically fasten along the top edge using staples or capped nails at appropriate spacing.
3. Lap field WRB over the top edge of the UMF12, maintaining a continuous shingle-lapped moisture plane.
4. Ensure the lower edge of the flashing directs water to drain freely away from the wall assembly.

WRB Integration

1. Install UMF12 flashing prior to or in conjunction with the field WRB to maintain proper lapping sequence (flashing under WRB at jambs, WRB under flashing at sill).
2. Seal critical laps and transitions with compatible Tamlyn flashing tape (XtremeFlashing Tape recommended for warranty eligibility).

Technical Specifications

Frequently Asked Questions

Q: Is the UMF12 approved for use around windows and doors under building codes?
A: Yes. The Utility Moisture Flash is approved for usage per ASTM E2112-01, which governs the installation of exterior windows and doors, making it a code-compliant flashing choice for these applications.

Q: What fasteners are required for installation?
A: The UMF12 is designed to be mechanically fastened using staples or capped nails. Note that cap fasteners are required throughout the installation per Tamlyn warranty terms.

Q: How long can the UMF12 be left exposed before the exterior cladding is installed?
A: The UMF12 is UV resistant for up to 365 days, allowing up to one full year of exposure during construction without performance degradation.

Q: What warranty does the UMF12 carry?
A: The Utility Moisture Flash is covered under Tamlyn's 15-year product-only limited warranty against manufacturing defects when installed per applicable Tamlyn installation instructions.

Q: Can the UMF12 be used as part of a warranted Tamlyn Water Management System?
A: The UMF12 is listed as a compatible accessory product within the Tamlyn Water Management Solutions warranty program. For the full 25-year product and labor warranty, the complete system must include TamlynWrap Drainable Wrap or ProSelect Commercial Wrap along with the required Tamlyn accessory products. Contact Tamlyn for system warranty registration details.

Q: How much coverage does a box of UMF12 provide?
A: Each roll covers 12 inches wide by 120 feet long. A full box of 20 rolls provides 2,400 linear feet of coverage at 12-inch width.