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Boral Home Additions & ADU: The San Antonio Owner’s Guide
If you have a Boral home addition or ADU in San Antonio and part of it is failing, we can get it matched, priced, and fixed. Most Boral additions and ADUs in our market run $45,000 to $130,000 when built new, but repair costs on a specific failing component usually run far lower, often $800 to $6,500 depending on what actually broke. The way owners usually find us: a door stops closing square, a window flange starts leaking into drywall, or a roofline separated where the addition ties into the original house.
Boral is a name most San Antonio homeowners know from Boral roofing products and Boral building materials, not from prefabricated room kits. If your addition was framed with Boral sheet goods, Boral roof tile, or Boral trim, the parts that fail are usually the flashing transitions, the tie-in points, and anything exposed to direct Texas sun. We are an independent San Antonio remodeler, not a Boral dealer, and we stock common Boral-compatible replacement trim, flashing, and tie-in hardware on our trucks.
Which Boral Models This Applies To
Boral doesn’t sell a single “home addition kit” the way a shed company does. Their products show up inside additions and ADUs as Boral roof tile, Boral TruExterior trim, Boral siding, and occasionally Boral PlasterMax or sheet goods used for sheathing and subfloor. That matters when a part fails, because the right fix depends on which Boral product line is involved.
The compatibility gotcha we see most in San Antonio: older Boral trim profiles from before the TruExterior naming change don’t match the newer extrusion widths. A 5/4″ Boral trim board from the 2010s is not the same profile as the current 5/4″ TruExterior trim, and trying to splice old to new leaves a visible seam that opens up within two to three Texas summers. We measure the actual board, not the paperwork, before we order.
For roof tie-ins, Boral roof tile has specific color lots and profiles. You can’t grab any barrel tile and call it matched. We verify the profile (usually a flat, low-profile, or mission-style tile) and check underside stamping before recommending an OEM Boral replacement or a quality aftermarket match. On trim and fascia, an aftermarket PVC or composite board often outperforms the original in San Antonio humidity and UV, but only if the profile is milled to match exactly.
Identify what you have before you call: look for a printed code or stamp on the backside of a removed trim board, on a roof tile underside, or on the edge of a sheathing panel. If you can’t find it, we can identify it on site.
Styles & brands we work with
Signs Your Boral Home Additions & ADU Is Failing
- Water staining at the ceiling-to-wall corner where the addition meets the original house. This is the most common Boral-related failure we see in San Antonio. It means the tie-in flashing has worked loose or was never properly stepped, and rain from our summer storms is getting behind the sheathing.
- Drywall cracks following the same line as a roof change or soffit corner. That crack isn’t cosmetic. It’s differential movement between the original framing and the addition, and it usually means a Boral trim or soffit piece is now bearing load it was never designed to carry.
- Door or window in the addition suddenly sticks or refuses to latch. Boral sheet goods hold moisture longer than plywood when they get wet. Once a Boral panel swells inside a wall cavity, it pushes door bucks and window frames out of square.
- You can see light through the soffit-to-wall joint from inside the attic. Go up with a flashlight. If daylight shows at the top plate, water is already getting in. The visible damage below won’t be far behind.
- Boral roof tiles sliding or broken after a windstorm. Boral tile is tough, but San Antonio gets microbursts that lift tiles. A single missing tile starts a chain reaction where the underlayment bakes in direct sun and fails.
See the difference
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After
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AfterReplacement Cost & What’s Included
For Boral-specific repair work on a San Antonio home addition or ADU, the installed price range we quote falls into clear bands. Trim and flashing repair runs $800 to $2,500 on most jobs. A section of Boral roof tile replacement with matching profile and color runs $600 to $2,500 depending on the square footage and tie-in complexity. If the failure has spread into structural framing behind the Boral sheathing, you are looking at a targeted rebuild, which lands at $3,000 to $10,000 rather than a whole-addition budget.
Every quote comes as a written line-item price before any work starts, which is our standard on every project. You see the part cost, the labor, the disposal, and the permit fee if one applies. The invoice you approve is the invoice you pay. We include the 365-Day Done Right Promise in writing on every Boral repair, so if the fix fails within a year, we return and make it right.
Here is how those bands break down for San Antonio:
- Boral trim or fascia replacement: $800–$2,500
- Boral roof tile section repair: $600–$2,500
- Flash-over or tie-in rebuild at the addition roof: $1,500–$4,500
- Structural repair behind failed Boral sheathing: $3,000–$10,000
- Full ADU or addition rebuild: $45,000–$130,000
DIY or Call Us?
Some of this you can check safely. You can inspect attic daylight, look for cracked grout lines, and note which door stopped latching. What you should not do is get on a two-story roofline with replacement Boral tiles without fall protection, or start pulling trim boards off a structural corner and exposing the wall to San Antonio rain.
The honest split: caulking a visible trim seam is an afternoon job if the underlying sheathing is dry. Rebuilding a tie-in where your addition meets the original roof is not. That’s up on a roof, often with rotted substrate, and one wrong flashing step means the leak comes back through a bedroom ceiling. We show up with the right profile match, the right fasteners, and the job done under the 365-Day Done Right Promise. If you want an honest read on whether your Boral addition failure is a patch or a rebuild, call (432) 547-6806 and we’ll walk the site with you.
FAQs
How long do Boral home additions and ADUs last in San Antonio? A properly flashed Boral addition or ADU in San Antonio lasts 30 to 50 years on the structural frame, with Boral trim and roof tiles typically hitting 15 to 25 years before needing replacement in our UV and hail exposure. The weak point is always the flashing tie-in, not the Boral material itself. Call (432) 547-6806 if you suspect a tie-in leak before it spreads.
Can a failing Boral addition part be repaired instead of replaced? Yes, in most cases the repair is localized to the failed trim, tile, or flashing section rather than replacing the entire addition. The exception is when water has sat long enough to compromise structural framing behind the Boral sheathing, which we confirm before recommending a repair scope. Call (432) 547-6806 for a free evaluation either way.
How long does the swap or repair take? Most Boral trim, flashing, and tile repair work in San Antonio is done in one day, with larger tie-in rebuilds taking two to three days depending on framing exposure. We give you a start date and a live arrival time before the crew shows up. Call (432) 547-6806 to schedule the visit.
Do you stock Boral-compatible parts on the truck? We keep common Boral roof tile profiles, TruExterior trim boards, flashing, and structural fixings on our San Antonio trucks, so most repairs are completed on the first visit. If your specific color lot or profile isn’t among them, we source it from our San Antonio suppliers and come back for install as soon as it lands. Call (432) 547-6806 and we’ll check stock while you’re on the phone.
Written by Luca Romano, Owner, Sawyer Remodel San Antonio at Sawyer Remodel San Antonio, serving San Antonio and nearby areas.
