Dektite #1 (DFE101B) EPDM Flexible Pipe Flashing

1. Introduction

This manual provides detailed instructions for the proper installation and use of the Dektite #1 (DFE101B) EPDM Flexible Pipe Flashing. This product is designed to create a watertight seal around pipes penetrating metal roofs, accommodating pipe diameters from 1/4 inch to 2-1/4 inches.

The Dektite #1 flashing features a durable EPDM rubber boot with a flexible aluminum collar, ensuring adaptability to various roof profiles and long-lasting performance.

2. Safety Information and Precautions

• Always wear appropriate personal protective equipment (PPE) including gloves and eye protection during installation.
• Exercise caution when working on roofs, especially on sloped or wet surfaces. Ensure stable footing and use fall protection if necessary.
• Important: This product is not rated for temperatures experienced by prolonged contact with a single-wall chimney. Failure to follow stated directions and specifications may result in damage to the Dektite flashing and surrounding materials.
• For single-wall chimney applications, consider using a high-temperature silicone flashing product specifically rated for such applications.
• Ensure all tools are in good working condition before use.

3. Product Features

• Material: EPDM rubber boot with a flexible aluminum collar.
• Pipe Diameter Range: Accommodates outside pipe diameters from 1/4 inch to 2-1/4 inches.
• Temperature Resistance: Continuous service temperature range of -58°F to +239°F.
• Base Dimensions: Square base measuring 5-1/2 inches x 5-1/2 inches.
• Adaptability: Designed to seal against uneven metal roofing profiles with ease.
• Durability: Resistant to breaking or cracking, ensuring reduced building maintenance.
• Customization: Easily customized on the job site to fit specific pipe sizes.

4. Setup and Installation

Proper installation is crucial for the Dektite #1 flashing to perform effectively and provide a watertight seal. Follow these steps carefully.

4.1 Standard Installation Steps

1. Determine Pipe Size: Measure the outside diameter (OD) of the pipe you intend to flash.
2. Cut Flashing: Using tin snips or scissors, cut the Dektite flashing to the exact pipe size. Do not use a utility knife, as this can damage the EPDM.
3. Slide Over Pipe: Carefully slide the Dektite flashing over the pipe. Ensure the flashing is seated horizontally on the roof surface.
4. Outline Base: Once the flashing is in position, draw an outline around the base of the flashing on the roof panel.
5. Apply Sealant: Apply a generous bead of approved sealant (e.g., silicone or polyurethane) to the underside of the drawn outline on the roof.
6. Press Flashing: Firmly press the Dektite base into the contours of the roof panel configuration, ensuring good contact with the sealant.
7. Fasten Flashing: Secure the Dektite to the roof surface using self-tapping or self-drilling screws. Fastener spacing should be approximately 1-1/2 inches. Apply additional sealant around the base if desired, covering screw heads.

Figure 1: Standard Dektite Flashing Installation Steps. This diagram illustrates the process from cutting the flashing to size, applying sealant, and securing it to the roof surface.

4.2 Retrofit Installation Steps

For existing pipes where the flashing cannot be slid over the top, a retrofit method can be used.

1. Prepare Flashing: Follow steps 1-5 of the Standard Installation (Section 4.1).
2. Cut Seam: Carefully cut the Dektite flashing along its pre-molded seam from the base to the top opening.
3. Wrap Around Pipe: Wrap the cut flashing around the existing pipe, ensuring the base is properly aligned with the roof contours.
4. Secure Seam: Secure the cut seam using a stainless steel clamp or appropriate fasteners to ensure a tight closure.
5. Seal Seam and Base: Apply a generous amount of sealant along the entire length of the secured seam and around the base of the flashing where it meets the roof, covering all fasteners.

Figure 2: Dektite flashing properly installed on a metal roof, sealing around a pipe.

4.3 Usage Guidelines

• For roofs with a 10/12 to 12/12 pitch, Dektite recommends installing the square base pipe flashing with the tip pointed towards the rooftop for optimal water shedding.
• When used with deep ribbed profile panels (1-1/2 inches deep corrugation or more), consider using the next size up Dektite flashing that will accommodate the same diameter pipe to ensure adequate sealing.

5. Maintenance

To ensure the longevity and continued performance of your Dektite #1 pipe flashing, periodic inspection is recommended:

• Annual Inspection: Visually inspect the flashing at least once a year, or after severe weather events.
• Check for Damage: Look for any signs of cracking, tearing, or deterioration of the EPDM rubber.
• Sealant Integrity: Examine the sealant around the base and any retrofit seams for signs of drying, cracking, or separation from the roof or flashing. Reapply sealant as needed.
• Fastener Security: Ensure all screws are tight and the flashing is securely fastened to the roof.

6. Troubleshooting

Most issues with pipe flashings are related to improper installation or sealant failure.

• Leaks Around Flashing:
  • Cause: Insufficient sealant, sealant failure, improper cutting of the flashing, or loose fasteners.
  • Solution: Re-inspect the entire flashing. Ensure the cut is precise for the pipe diameter. Clean the area, remove old sealant, and reapply a fresh, continuous bead of high-quality sealant around the base and any seams. Tighten or add fasteners if necessary.
• Flashing Not Seating Properly:
  • Cause: Incorrect flashing size for the roof profile or pipe diameter, or insufficient pressure during installation.
  • Solution: Ensure the correct Dektite model is used for the pipe and roof type. For deep ribbed panels, a larger base flashing might be required. Apply firm, even pressure when seating the flashing.

7. Specifications

Figure 3: Detailed view of the Dektite #1 flashing, highlighting the pipe diameter markings.

8. Warranty

The Dektite #1 (DFE101B) Flexible Pipe Flashing comes with a 20-year manufacturer's warranty against manufacturing defects. This warranty covers defects in materials and workmanship under normal use and service.

For warranty claims, please retain your proof of purchase and contact the manufacturer directly.

9. Support and Contact

For further assistance, technical support, or inquiries regarding the Dektite #1 (DFE101B) Flexible Pipe Flashing, please contact Dektite directly through their official website or customer service channels.

Manufacturer: Dektite