MFM Roof Deck Tape Self-Adhered Seam Tape 4 in x 67 ft – 48304

MFM Roof Deck Tape 48304 is a 40 mil, self-adhered 4 in x 67 ft seam tape for sealing roof deck panel joints before underlayment. It is for fortified and moisture-control roof assemblies where seams need a dedicated tape layer under the primary roofing underlayment.

Key Specs

• Model / MPN: 48304
• Brand: MFM
• Type: Self-adhered roof deck seam tape
• Size: 4 in x 67 ft
• Thickness: 40 mil
• Adhesive: Aggressive asphalt-based adhesive system
• Surface: Non-slip film
• Application: Taping roof deck joints and seams
• Sell unit: Roll

Coverage & How Much You Need

One roll provides 67 linear ft of seam tape before cuts, overlaps, and end waste.

• Measure required linear footage from the takeoff.
• Add waste for cut ends, overlaps, and layout constraints.

Compatibility / Fitment

Use over clean plywood, OSB, rigid foam, metal, and other manufacturer-approved roof deck substrates. Do NOT use as the exposed finished roof, and do not apply over dirty, wet, frosty, or incompatible surfaces outside the installation instructions.

FAQs

What is this tape used for?

It tapes roof deck joints and seams to reduce water, air, and moisture entry before the roof is covered with felt, synthetic underlayment, or self-adhered underlayment.

How long is one roll?

The 48304 roll is 4 in wide x 67 ft long. Count roof deck seams by linear foot, then add waste for cut ends and overlaps.

What substrates does it stick to?

MFM states Roof Deck Tape adheres to plywood, OSB, rigid foam insulation, metal, and other common roof deck materials when properly prepared.

Does it self-seal around fasteners?

Yes. MFM describes the adhesive as self-sealing around roofing fasteners such as nails, screws, and staples to maintain the barrier at fastener penetrations.

Is this required by code?

Some building codes or fortified programs may require roof deck seam tape in specific assemblies. Verify the project code, insurer, and Fortified requirements before ordering.

Roof-deck seam taping is roof work. Use fall protection, gloves, and manufacturer temperature/substrate guidance for adhesive handling.

Product Expert Notes

This should rank well for pro searches because it names the real use case: roof-deck seam sealing before underlayment, with exact size, thickness, substrate compatibility, and fortified-program context.