IKO Underlayment & Deck Repair Nationwide

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

We stock and install IKO-compatible underlayment and decking repair materials in Jacksonville, with most repairs running $540 to $1,800 depending on the size of the damaged area and which IKO underlayment product you have. Most underlayment and deck repairs take one visit, and we carry the common IKO-compatible configurations on the truck so you don’t wait on a parts order. What usually brings someone to this page: a roof leak after a storm, soft spots under the shingles found during an inspection, or shingle damage that exposed the layers underneath to Florida’s rain and heat.

Call (904) 719-6346

Underlayment is the water-resistant barrier between your plywood deck and your IKO shingles. The deck itself is the wood or OSB sheathing everything fastens to. Both silently hold your roof together until they don’t.

Key Takeaways

• IKO underlayment replacement in Jacksonville typically costs $540 to $1,800 installed, depending on area size and material type.
• We’re an independent Jacksonville roofing contractor, not affiliated with IKO directly, but we install IKO materials and match their specifications daily.
• Most underlayment and deck repairs are done in a single visit, and we keep common IKO-compatible materials on the truck.
• Florida’s heat and hurricane-driven rain age underlayment faster than the national average. If you’re past year 10 on original felt, inspection matters.

Which IKO Models This Applies To

IKO makes several underlayment lines, and the repair path differs by which one your roof has. The main products we run into across Jacksonville roofs: IKO RoofGard-Cool (a synthetic underlayment popular under IKO Cambridge and Dynasty shingles), IKO RoofGard-SB (a self-adhesive base sheet used in eaves and valleys), and IKO StormShield (a peel-and-stick ice and water barrier that goes under the first course and in critical areas). If you’re unsure which you have, check the attic side of the deck or any leftover rollout label on your garage shelf.

Here’s the IKO-specific gotcha we tell every Jacksonville homeowner: IKO’s synthetic underlayments are engineered to work with their shingle breathability specs, but Florida code adds a wrinkle: in clay-heavy soil areas like the Westside and parts of Mandarin, attic humidity spikes, and a non-breathable underlayment can trap moisture against the deck. So when we replace underlayment on an IKO roof, we verify attic ventilation before matching material. Most aftermarket synthetics work, but an OEM-equivalent StormShield or RoofGard is the conservative spec if your roof is still under an IKO warranty.

Decking is simpler: IKO shingles don’t dictate deck thickness. Florida code and our local permitting path require minimum 15/32-inch plywood or 7/16-inch OSB decking, and if your deck is 3/8-inch from a 1980s build in Arlington or Lakewood, it’s a re-deck job, not a patch. We handle both.

Signs Your IKO Underlayment & Deck Repair Is Failing

• Dark brown stains on the ceiling or wall. Water’s already through the deck and traveling. The underlayment hasn’t stopped the leak, and the deck is wicking it inside. We see this most after summer squalls off the Atlantic push rain sideways into ridge venting.
• Curling or lifted shingle edges near valleys or eaves. The underlying adhesive underlayment (StormShield or equivalent) may have lost adhesion from heat cycling. Jacksonville attics hit 140 degrees in July, and peel-and-stick underlayment can slowly creep out of adhesion after 10 to 12 years.
• Soft spots when walking the roof or pressing from the attic. Decking has rotted. In Florida’s humidity, once water gets between felt and wood, it doesn’t dry out. OSB decking fails faster than plywood here.
• Visible felt or synthetic wrinkles through missing shingles. If you can see underlayment, it’s exposed to UV, which breaks down synthetics and felts within a season. Underlayment is made to be covered, not baked.
• Granules in the gutter in streaks, not uniform. This often points to deck problems underneath, not shingle batch issues. When decking flexes, shingles flex with them, and granules release unevenly.

Replacement Cost & What’s Included

Those Jacksonville numbers cover material, labor, tear-off disposal, and our written workmanship guarantee. What moves the price: slope and story height (a two-story cut-up roof in Ortega runs higher than a ranch in San Jose), current deck condition, and whether your original install used nail patterns that now need code upgrades. Underlayment and deck work carries our 365-Day Done Right Promise in writing, and if the repair fails within that year, we come back at no charge. That’s the entire point of the guarantee.

DIY or Call Us?

You can safely check the attic side of your deck for dark streaks and press for softness. You can also document what you see before calling, which helps our estimator give you a tighter range before we arrive. What we’d flag: patching underlayment and decking from the top means removing shingles with a pry bar, on a ladder or on the roof itself, in Florida heat. One wrong step on a soft deck puts a foot through the ceiling below. And if the deck is compromised, it is a structural fall hazard, not a weekend fix. That’s not a scare tactic. That’s what we tell neighbors in Mandarin and Riverside the same way.

If you want the number before any work starts, call (904) 719-6346. We’ll come out, inspect, and put the price on paper first. If it’s not right, we’re not done.

FAQs