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Delta Trela – Pitched Metal Roof Underlayment – 3’3” x 98’

Delta Trela – Pitched Metal Roof Underlayment – 3’3” x 98’

$676.31


FREE SHIPPING
SKU DT3.3x98

Delta Trela by Dörken is a high-performance underlayment designed for pitched metal roofs. Its structured separation layer provides ventilation and drainage, preventing moisture buildup, condensation, and corrosion beneath metal roofing. Made from durable, vapor-permeable material, Delta Trela ensures a dry, protected roof assembly while reducing noise and enhancing long-term performance. Ideal for residential and commercial applications, it delivers superior protection and durability for metal roof systems.

Roll Size: 3.3' x 98' (323 Sq Ft)

Product Info

  • Free Shipping
  • Need a written quote? Request Online
  • Questions?  Call (800) 731-8420

Product Benefits

  • 8mm studded fiber mat ventilates the underside of the metal panels
  • Drainage course – studded structure reliably channels residual moisture to the exterior
  • Vapor permeable, watertight fabric ensures airtightness and allows moisture within the roof cavity to escape via diffusion
  • Rattling noise from rain or hail is reduced by up to 15dB
  • Installed parallel to the eaves, with the studded structure facing upwards, the next section of membrane is overlapped in shingled fashion, ensuring that water is shed to the exterior
  • Burled, studded texture provides a non-slip surface during installation
  • One-step installation, faster and easier than applying an underlayment and a separation layer in independent steps, saving time and money on project schedules
  • Included with every roll is a package of 120 DELTA®-SEALING NAILS used for fastening

SHIPPING TIME

  • All Delta rolls ship for free (standard ground, see map)
  • Call: (800) 731-8420 for pricing and shipping questions.

    Shipping estimates shown on the map pertain to this specific product only. Orders typically ship within 5 business days if the order is placed before 12:00 noon EST. Transit times displayed in the map are listed in business days, and are approximate.  The day that the order is shipped is not counted as a transit day.

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    Delta® Trela – Pitched Metal Roof Underlayment: An Overview

    An advanced ventilating underlayment engineered to extend the life of pitched metal roofs by managing moisture and sound.

    Delta Trela roof underlayment on pitched roof
    Delta® Trela installed under pitched metal roofing

    What is Delta® Trela?

    Delta® Trela is a ventilated underlayment specifically designed for pitched metal roofs. It creates a structured separation and ventilation layer between the metal roofing and the roof deck, preventing trapped moisture and heat buildup that can shorten the lifespan of roof assemblies.

    Its unique three-dimensional mesh design reduces the risk of corrosion under metal panels, minimizes noise from rain impact, and helps ensure a long-lasting, high-performance roof system.

    Installer standing on Delta Trela underlayment
    Safe and durable surface for installers

    How it works

    Delta® Trela features a structured entangled mesh that forms an air gap (approx. ¼" thick) beneath metal roof panels. This allows condensation to drain away and promotes continuous ventilation beneath the roofing. The built-in separation layer prevents direct contact between the metal roofing and the substrate, reducing corrosion risk and temperature stress.

    Key benefits

    • Moisture management: Effectively drains condensation, protecting metal panels and the roof deck.
    • Ventilation: Built-in air gap reduces heat buildup and prolongs service life.
    • Corrosion resistance: Prevents direct contact between metal and underlayment.
    • Noise reduction: Damps rain and impact noise on metal roofing.
    • Durability: Manufactured from robust, weather-resistant materials designed for decades of performance.
    Cutting Delta Trela roof underlayment during installation
    Easy to cut and install on-site

    Applications

    Delta® Trela is suitable for:

    • Pitched standing seam metal roofs
    • Residential homes in humid or cold climates
    • Roofs with condensation or noise concerns
    • Renovations or retrofits with metal roofing

    Installation overview

    1. Prepare the roof deck with code-approved sheathing and underlayment.
    2. Unroll Delta® Trela horizontally across the roof deck.
    3. Cut to fit with utility knives or shears around penetrations and edges.
    4. Overlap seams per manufacturer recommendations.
    5. Install metal roofing directly over Delta® Trela using standard fastening methods.

    Case study: Residential standing seam roof

    Project: A homeowner in a coastal climate installed a new standing seam metal roof to handle high rainfall and salt exposure.

    Challenge: Previous roofing systems had suffered from trapped moisture under panels, leading to corrosion and costly maintenance.

    Solution: Delta® Trela was specified as the ventilated underlayment. The structured mesh provided continuous airflow beneath the panels while reducing sound transmission inside the home during heavy rain.

    Outcome: After one year of service, inspections showed no visible condensation issues, reduced noise levels, and no panel discoloration. The homeowner reported a noticeably quieter and more durable roof system.

    Frequently Asked Questions

    What makes Delta® Trela different from other roof underlayments?
    It includes a 3D ventilating mesh layer that provides drainage, airflow, and sound reduction specifically for metal roofs.
    Is Delta® Trela suitable for all roof pitches?
    It is designed for pitched metal roofs. Flat roofs require different moisture management systems.
    Does it reduce roof noise?
    Yes. The entangled mesh helps dampen rain and impact noise, making interiors quieter under metal roofs.
    Can it be used in coastal or humid areas?
    Yes. It is ideal in moisture-prone environments where condensation and corrosion are concerns.
    How thick is Delta® Trela?
    The structured mesh layer provides approximately ¼" (6 mm) of ventilation space beneath metal panels.
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