DELTA®-TRELA is a vapor permeable underlayment with structure separation and drainage, specifically designed for metal roofs with metal cladding. The underlayment prevents corrosion and moisture accumulation underneath panels, ensuring the longevity of your metal roof.

Benefits:

• 8 mm 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