IKO Underlayment & Deck Repair Nationwide

IKO Underlayment & Deck Repair: The Miami Owner’s Guide

IKO underlayment and deck repair in Miami typically runs $450 to $1,800 installed, depending on how much decking has rotted and which IKO underlayment product your roof needs. We stock IKO-compatible synthetic underlayment and plywood decking on our trucks, so most repairs are done in a single visit. The most common way Miami homeowners discover this problem is a ceiling stain after a heavy afternoon storm, or shingles that look wavy from the curb because the deck underneath is no longer flat. By the time you see those signs, water has usually been working on the underlayment for months.

Call (850) 613-1762

Underlayment is the waterproof layer between your roof deck (the plywood or OSB sheets nailed to the rafters) and your IKO shingles. Deck repair means cutting out and replacing sections of that wood when Miami’s humidity and storm-driven rain have gotten past the underlayment and started rotting it. Both jobs are connected: you rarely replace one without addressing the other. We’re an independent Miami roofing contractor, not affiliated with IKO, but we work with their products daily and know exactly how their underlayment performs in South Florida conditions.

Which IKO Models This Applies To

IKO makes several underlayment lines, and the one your roof needs depends on what’s already up there. The two you’ll see most often in Miami are IKO Stormtite and IKO GoldShield. Stormtite is a synthetic underlayment with a slip-resistant surface, rated for long-term exposure before shingles go on. GoldShield is an SBS-modified asphalt underlayment that self-seals around nails, which matters in Miami because we get horizontal rain driven by afternoon squalls. If your roof currently has a felt-paper underlayment from an older build, it was never designed for our humidity cycle, and replacing it with a synthetic or SBS product is the right call.

The compatibility gotcha with IKO: their architectural shingle lines (Cambridge, Dynasty, Nordic) carry specific underlayment requirements for the wind warranty to stay valid. If you have Dynasty shingles and the underlayment was swapped for a non-IKO product after a past repair, the shingle warranty can be voided without you ever knowing. We check this on every inspection. When we open a roof, we verify what’s actually underneath before we recommend a replacement path, because what the last crew said they installed and what’s actually there don’t always match in Miami.

Aftermarket synthetic underlayments from GAF, Owens Corning, and CertainTeed can work fine under IKO shingles, but for full warranty compliance we generally recommend staying with IKO’s own underlayment when the shingles are IKO. If budget is the constraint, we’ll tell you the honest difference in writing before you choose.

Signs Your IKO Underlayment & Deck Repair Is Failing

• Water stains on ceilings or walls after rain. This is the obvious one, but by the time water reaches the drywall it has already passed through the shingles, the underlayment, and the deck. The repair is usually bigger than the stain suggests because the deck has been wet long before you saw anything.
• Shingles that look rippled or uneven from the street. Decking swells when it absorbs water. Once the plywood or OSB starts to delaminate, it won’t sit flat, and the shingles above it telegraph every bump. This is a deck problem, not a shingle problem.
• Granules collecting in your gutters in heavy amounts. Some granule loss is normal as IKO shingles age, but a sudden heavy deposit after a storm can mean the shingles are flexing more than they should, often because the underlayment or deck below has failed.
• Soft spots when walking the roof. If the deck gives underfoot, you have rot. In Miami, this tends to happen first around penetrations like vents, skylights, and pipe collars, where the underlayment was cut and sealed and the seal eventually failed.
• Musty attic smell or visible mold on the underside of the decking. This means moisture has been trapped. Miami attics are already brutal in summer; when you add water intrusion, mold follows fast. That smell is your first clue the underlayment has been failing silently.

Replacement Cost & What’s Included

The range comes down to two things: how much deck is rotted and how steep the roof is. A one-story ranch in Kendall is easier than a two-story tile-heavy home in Coral Gables. Material-wise, IKO Stormtite runs more than basic felt but less than some premium synthetics. We hand you a written price before any work starts, and that price doesn’t change unless you ask for additional scope. The repair itself is covered by our written guarantee, backed by the 365-Day Done Right Promise: if it fails within a year, we come back and fix it at no charge.

DIY or Call Us?

What a homeowner can safely check: attic staining from water, visible daylight through the deck boards, and shingle conditions from the ground with binoculars. Those observations help us price faster, and they help you know if the problem is urgent.

What you should not do is get on the roof and start cutting. The danger here isn’t the same as high-tension springs or live electrical, but walking a roof with a failed deck can put a boot through rotted plywood, and a fall off a Miami barrel-tile roof or a two-story deck edge is a hospital trip. Plus, underlayment and deck work means pulling shingles and re-nailing them correctly, and a badly re-nailed IKO shingle row will leak within weeks. This is one of those jobs where the attempted savings usually turn into a full re-roof later. If you want an honest look at whether the repair is small or large, call (850) 613-1762 and we’ll confirm what we’re seeing before we ever set a ladder.

FAQs