Georgia Roof Guide

What is roof decking seam tape, and is it worth it?

Short answer. Roof deck seam tape is a self-adhered waterproof tape applied over the joints between sheathing panels before the underlayment goes on. It creates a sealed roof deck, so if shingles and underlayment blow off in a storm, rain cannot pour through the seams, which is why the IBHS FORTIFIED Roof program accepts it as one way to seal the deck.

The problem it solves

When a severe storm strips shingles and underlayment, the gaps between deck panels become open channels into the attic. Even a short downpour through those seams can soak insulation and ceilings, and interior water damage often costs more than the roof itself. Seam tape keeps that water out while the roof waits for repairs.

How it is installed

  1. The deck is swept clean and must be dry.
  2. Tape, typically several inches wide, is rolled over every horizontal and vertical seam between panels and pressed down firmly.
  3. Underlayment goes over the taped deck as usual, followed by shingles.

The alternative way to seal a deck is full coverage with a self-adhered membrane instead of tape plus underlayment.

The FORTIFIED connection

IBHS FORTIFIED Roof is a construction standard designed to keep roofs on and water out in severe wind. A sealed roof deck is one of its requirements, along with stronger deck nailing with ring shank nails and upgraded edge details. Some insurers offer credits for FORTIFIED designations, which require an evaluator's inspection. Ask your agent whether it applies in your area.

Is it worth it?

The tape and labor are a modest addition to a full replacement, and the only time to do it is when the deck is bare. For homes in open, wind-exposed areas, or owners pursuing a FORTIFIED designation, it is a strong upgrade. For a sheltered house where storms rarely strip shingles, the benefit is smaller but still real.

See synthetic underlayment vs felt and wind damage to roofs in Georgia.

In depth

Architectural or 3-tab shingles: which is right for a Georgia home?Architectural vs 3-tab shingles in Georgia: weight, wind warranties, lifespan, availability as 3-tab lines shrWhat shingle color is best for a hot Georgia summer?How shingle color changes roof and attic heat in Georgia, what cool roof shingles really reflect, where to finOSB or plywood roof decking: which is better, and what happens at a reroof?OSB vs plywood roof decking in Georgia: span ratings and thickness, how each fails when wet, plank decks, and

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