Tamko Underlayment & Deck Repair: The Miami Owner’s Guide
Tamko underlayment and deck repair in Miami typically runs $1,800-$4,200 installed, depending on how much decking has rotted through and whether we’re matching to an existing Tamko Heritage or Titan XT system. We stock Tamko-compatible underlayment on every truck, and most deck repairs we can start same-day once we’ve had a look underneath your shingles. Most Miami homeowners find out they need this work when water starts dripping through a ceiling during our summer storms, or when a roofer pulls up old shingles and finds the plywood beneath has turned to wet cardboard.
Which Tamko Models This Applies To
Tamko’s two main residential lines in Miami are the Heritage series and the newer Titan XT, both of which ship with Tamko’s MetalEdge underlayment as standard. The Heritage line uses a 15-pound felt base with fiberglass reinforcement, while the Titan XT pairs with a synthetic underlayment rated to 180 days of UV exposure. If you’re trying to identify what you’ve got, check the printed strip along the underlayment edge, Tamko stamps the product name and ASTM rating there in red ink.
Here’s where compatibility gets tricky in Miami’s market. Tamko switched from asphalt-saturated felt to synthetic underlayment on most Titan XT bundles around 2019. If your roof was installed before that with Heritage shingles, you likely have felt. If you patch synthetic over felt without proper transition flashing at the seams, you’ll get a moisture trap that rots the deck from the inside out. We’ve seen this exact failure in Coral Gables ranch homes where a handyman did a partial repair.
We carry both OEM Tamko underlayment and a Miami-grade synthetic equivalent rated for 250°F attic temperatures, which matters more than most people realize. Your attic in July can hit 140°F easy, and cheap underlayment degrades fast. We don’t substitute without telling you, and we don’t use anything that isn’t authorized for Tamko systems.
Ridgeline Roofing Co. of Miami is an independent service provider, not affiliated with Tamko. We are, however, authorized to install their products per manufacturer spec.
Signs Your Tamko Underlayment & Deck Repair Is Failing
- Water stains on ceiling drywall that grow after heavy rain. This usually means your underlayment has torn at a seam or fastener hole, letting water past the shingle layer and onto the deck below. In Miami, the combination of wind-driven rain and low-slope sections makes this the most common call we get from Pinecrest and Palmetto Bay.
- Soft or spongy spots when walking on the roof. The OSB or plywood deck beneath the underlayment has absorbed moisture and begun delaminating. Once you can feel flex underfoot, the deck has lost structural integrity and needs replacement, not just new underlayment on top.
- Shingles curling or buckling in straight lines. This follows the seams of failed underlayment underneath. Moisture gets in, the deck swells, and it pushes the shingle course up from below. We see this pattern a lot on Tamko roofs where the original installer used staples instead of cap nails on the underlayment.
- Mold smell in the attic during humid months. Your underlayment is breathable in theory, but once compromised it traps condensation against the deck. Miami’s humidity doesn’t forgive that. If you smell mustiness in August, something’s not ventilating right, and the underlayment is often the first failure point.
- Granules collecting in gutters right after installation. This seems like a shingle problem, but it can signal deck movement underneath. A rotting deck flexes more than it should, working the shingle adhesive loose and accelerating granule loss. We’ve traced premature granule shedding back to deck rot on ten-year-old Tamko Heritage roofs in Coconut Grove.
Replacement Cost & What’s Included
| Scope of Work | Typical Range in Miami |
|---|---|
| Underlayment replacement only (no deck damage) | $1,800 - $2,800 |
| Underlayment + localized deck repair (1-2 sheets plywood) | $2,800 - $3,600 |
| Underlayment + extensive deck replacement (3+ sheets, rafter sistering) | $3,600 - $4,200+ |
What drives the range is simple: how much plywood we have to pull and whether the rafters underneath are still sound. Miami’s building code requires 5/8-inch CDX plywood minimum for roof decks, and we don’t downgrade to OSB even if that’s what came off. Labor includes removing shingles to the deck, inspecting every square foot with photos, installing new underlayment per Tamko’s nailing pattern, and replacing shingles to match. The 90-Day Done Right Promise covers it all, no paperwork, no arguing. If it is not right, we make it right.
DIY or Call Us?
There is one thing a homeowner can safely check: go into your attic with a flashlight during daylight and look for pinholes of light coming through the roof deck. Those are fastener holes that have widened, and they mean your underlayment has shifted or torn. Mark the spots with tape so you can show a roofer.
Everything past that observation belongs to someone with fall protection and a nail gun. Walking a pitched roof in Miami humidity is how people get hurt, and tearing off shingles to expose the deck means working on a surface with no grip. More importantly, you won’t spot the deck rot that extends past the obvious leak. We’ve opened up what looked like a two-foot repair and found six feet of compromised plywood, because water travels along the underlayment seam before it drips. A roof doesn’t lie. Neither do I.
Call (855) 837-1678 and we’ll get a technician out with a camera. Estimates are free, and most repairs we finish in a single day.
FAQs
In Miami’s climate, properly installed Tamko synthetic underlayment lasts 20-25 years, while traditional felt degrades faster, often showing wear at 12-15 years. The difference is UV exposure during construction and attic heat accumulation; south-facing roofs in Miami Beach age on the shorter end of that range. If your underlayment is original to a 1990s roof, it’s living on borrowed time. Call (855) 837-1678 for a free inspection and honest timeline.
Patching underlayment is possible only in very limited cases where the damage is a single puncture from a fallen branch and the surrounding deck is bone dry. In practice, once underlayment fails in one area, the adjacent seams are usually compromised too, and patching creates more weak points than it solves. We don’t do partial underlayment repairs on Tamko systems because the manufacturer warranty requires continuous coverage. For a full assessment of your specific situation, call (855) 837-1678, estimates are free.
Most Tamko underlayment and deck repairs we complete in one working day, though extensive deck replacement or matching discontinued shingle colors can push a complex job to two days. We don’t leave your roof exposed overnight; if we have to pause, we install temporary weatherproofing that holds against Miami’s afternoon storms. You’ll know the timeline before we start, not after. Call (855) 837-1678 to schedule.
We carry Tamko-compatible underlayment on every service truck, including the synthetic grade rated for extended UV exposure that Miami’s permit timeline sometimes requires. For exact color matches on Heritage or Titan XT shingles, we may need to pull from our warehouse or distributor same-day; we don’t make you wait two weeks for a standard repair. If you need a specific Tamko product line matched, call (855) 837-1678 and we’ll confirm stock before we roll.
We also stock parts for GAF, Owens Corning, and CertainTeed systems if your roof uses multiple manufacturer components from a previous repair.
Written by Carlos Espinosa, Owner, Ridgeline Roofing Co. of Miami at Ridgeline Roofing Co. of Miami, serving Miami and nearby areas.