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How to Install DELTA®-FL Subfloor System: A Comprehensive Guide

Posted by Spycor Building on Jul 30th 2025

Are you looking to protect your basement from moisture, reduce dampness, or prevent mold growth under your flooring? DELTA®-FL is your answer. This dimpled, heavy-duty polyethylene membrane creates a crucial air gap beneath your concrete slab, allowing hydrostatic pressure to equalize and effectively blocking moisture migration. It even provides a thermal break, making your basement floor feel warmer and more inviting.

What is DELTA®-FL?

The DELTA®-FL system is engineered by Dörken, a trusted name in building materials, to provide superior moisture protection for concrete and slab-on-grade floors. Made from High-Density Polyethylene (HDPE), it boasts impressive impact resistance with a compressive strength exceeding 4500 lb/sf. With a minimal reduction in headroom (just 8 mm), it's an ideal solution for any basement renovation.

Whether you're installing carpeting, vinyl, hardwood, or laminate, DELTA®-FL provides the perfect base, ensuring your floors remain protected from below-grade moisture. It's lightweight and available in convenient roll sizes, making it suitable for both professional builders and DIY enthusiasts.

DELTA®-FL Installation: A Step-by-Step Video Guide

For a visual walkthrough of the installation process, watch our comprehensive "How to Install DELTA®-FL" video:

Installation Steps

  1. Prepare the Surface: Ensure the concrete floor is clean, dry, and free of debris. Remove any sharp objects that could puncture the membrane.
  2. Measure and Cut: Measure the room dimensions and cut DELTA®-FL rolls to fit, allowing for a slight overlap (about 2 inches) at seams.
  3. Lay the Membrane: Roll out the DELTA®-FL with the dimpled side facing down against the concrete. Ensure the flat side faces up for flooring installation.
  4. Seal the Seams: Use DELTA®-FL sealing tape to secure overlaps, creating a continuous moisture barrier. Alternatively, use seam clips for faster assembly.
  5. Install Finished Flooring: Place your chosen flooring (laminate, vinyl, etc.) directly over the DELTA®-FL, following the manufacturer’s guidelines.

Why Choose DELTA®-FL for Your Flooring Project?

The DELTA®-FL subfloor system stands out for its ability to protect against moisture while enhancing comfort and durability. Its air-gap technology prevents mold and mildew, making it ideal for damp environments. Additionally, its lightweight design simplifies installation, reducing labor costs and project timelines. By choosing DELTA®-FL, you’re investing in a reliable, eco-friendly solution backed by Dörken’s industry-leading expertise.

By following this guide, you’ll ensure a successful DELTA®-FL installation, protecting your floors from moisture and enhancing their longevity. For further assistance, contact Spycor Building Products or explore our Resource Hub for additional tools and insights.

Downloadable Resources for Your Project

  • DELTA®-FL Brochure: Get an in-depth overview of the product's features and benefits.
    DOWNLOAD HERE

  • DELTA®-FL Installation Instructions: Detailed written instructions to guide you through every step.
    DOWNLOAD HERE

  • DELTA®-FL Technical Data: Access specifications and performance data for building professionals.
    DOWNLOAD HERE

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