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Boral Underlayment & Deck Repair: The Miami Owner’s Guide
If you’re dealing with failed Boral underlayment or rotted decking under a barrel or flat tile roof in Miami, we stock Boral-compatible underlayment and decking materials and install them every week. Most underlayment replacement and deck repair jobs on Boral roofs in Miami run between $1,800 and $5,200 installed, depending on how many squares of underlayment need to come off and how much decking has to be replaced. You’ll usually discover the problem the hard way: a water stain on the ceiling, granules in the gutter, or a tile that shifted during the last storm revealing felt that’s been baking in the Miami sun since the day it was laid. We’re Tilehurst Roofing Miami, and we can typically get eyes on your roof within a day or two and have a written price in your hands before any work starts.
Which Boral Models This Applies To
Boral’s tile roofing systems in Miami split into two main camps: barrel tile (the classic S-curve profile you see all over Coral Gables and Pinecrest) and flat/low-profile tile common on newer construction. Underlayment on these systems is either a peel-and-stick modified bitumen base sheet with a granulated cap sheet, or a multi-layer 30-lb felt system on older homes. The compatibility gotcha most owners miss: Boral’s barrel tile profiles require a heavier underlayment spec than a standard asphalt shingle roof. We match the underlayment weight and type to the tile profile, not just “whatever’s on the truck.” If you can see the original underlayment tag (usually visible at the eave or in the attic at a pipe penetration), we can identify it. No tag? We measure the existing material thickness and confirm exposure before ordering. OEM Boral-branded underlayment works, but we also install proven aftermarket systems from GAF, Owens Corning, and CertainTeed that meet or beat the original spec, often with better warranties than what was originally on the roof.
Styles & brands we work with
Signs Your Boral Underlayment & Deck Repair Is Failing
- Water stains on ceilings or walls – The underlayment has worn through or torn under a shifted tile, and water is now finding the plywood deck. In Miami’s afternoon downpours, this shows up fast.
- Granules in the gutter or downspout – That’s the cap sheet eroding. Underlayment on Boral roofs takes brutal UV exposure at the tile gaps, and granule loss means the waterproofing layer is nearly spent.
- Tiles that sit uneven or rock when stepped near the edge – The decking underneath has started to rot or delaminate from long-term moisture. The tile is now floating on soft wood, which only gets worse.
- Spongy spots you can feel from inside the attic – Rotted decking feels softer than solid plywood under hand pressure. Miami humidity accelerates this once water gets past the underlayment.
- Daylight showing through the roof boards from the attic – Gaps or cracks in the deck mean the structural layer beneath your Boral tile has opened up. Underlayment can’t do its job over a failing deck.
Replacement Cost & What’s Included
Here’s what we’re quoting on most Boral underlayment and deck repair jobs in Miami right now:
- Underlayment replacement (partial, up to 3 squares) – $1,800 to $2,900 installed
- Underlayment replacement (full roof) – $3,500 to $5,800 installed, depending on tile removal method
- Deck repair (patching rotted sections) – $850 to $1,600 per affected area, added to underlayment scope
- Full deck replacement – $3,200 to $6,400 additional, if rot extends over a large area
What moves the number: roof size, how much decking is rotted, whether tiles are reusable or need replacement, and roof height/access. Every quote includes a written line-item price, and every repair carries a written guarantee. Know the price before we touch the roof – that’s the only way I know how to work.
See the difference
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AfterDIY or Call Us?
Underlayment and deck work on a Boral tile roof is a job for trained professionals. The tiles are heavier than they look, a drop from a Miami two-story roofline is a serious injury, and walking on tile without understanding how weight transfers can crack more tiles than you fix. What you can safely do: check your ceilings for stains, clean debris from valleys and scuppers, and call us if you see anything questionable. We’ll inspect the roof, identify exactly what failed, and give you a written price before a single tile comes up. Call (850) 613-1762 to schedule a free estimate.
FAQs
In Miami’s heat and hurricane seasons, Boral underlayment typically lasts 20 to 30 years, often less than the tile above it. This is why underlayment replacement is so common on homes where the tile still looks fine.
Yes, in many cases we can do a partial underlayment repair by removing tiles in the affected area, patching the underlayment with matching material, and re-bedding the tiles. If the underlayment failure covers more than about a third of the roof, full replacement usually costs less per square and gives you a cleaner result.
Most underlayment replacement jobs on Boral roofs in Miami take 2 to 4 days depending on roof size and weather. Deck repair adds a day if the scope grows once tile comes off.
We stock Boral-compatible underlayment systems and plywood decking on our trucks and at our Miami supplier, so most jobs proceed without waiting on materials. If your roof needs a specific underlayment spec, we’ll have it ordered and on site before the crew starts.
Call Tilehurst Roofing Miami for Boral Underlayment & Deck Repair
If you’re seeing water stains, granule loss, or shifted tiles on your Boral roof, call us at (850) 613-1762. We’ll schedule an inspection, show you exactly what failed, and put a written price in your hands before any work starts. Tilehurst Roofing Miami is an independent roofing company, not affiliated with Boral, and we stand behind every repair under our 365-Day Done Right Promise.
Written by Greg Holloway, Owner, Tilehurst Roofing Miami at Tilehurst Roofing Miami, serving Miami and nearby areas.