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Boral Home Additions & ADU: The Jacksonville Owner’s Guide
If you’re planning a home addition or ADU in Jacksonville and want Boral materials specified into the build, a typical project runs $45,000 – $130,000 for an addition and $90,000 – $220,000 for a complete ADU, depending on square footage, foundation work, and finish level. We stock and install Boral-compatible trim, siding, and exterior profiles alongside the named materials we use every day, and we’ll match the Boral product line to the rest of the structure before any work begins. Most owners reach out to us when they’ve discovered a prior addition used mismatched exterior profiles, or when they’re planning a new detached unit and want the exterior trim to hold up through Jacksonville’s wet summers without warping or swelling.
We are an independent remodeling contractor in Jacksonville, not affiliated with Boral. What we bring is a working knowledge of how Boral’s poly-ash and composite profiles behave in our climate, and a written price before any work starts.
Which Boral Models This Applies To
Boral manufactures trim, fascia, siding, and porch components across several product families that show up repeatedly in Jacksonville additions and ADUs. The two lines we specify most often are Boral TruExterior (a poly-ash profile used for trim, fascia, and corner boards) and Boral Versetta Stone (a stone veneer panel system, though that’s a different material class than the exterior trim profiles most addition plans call for). Under the TruExterior umbrella, you’ll see boards, sheets, beadboard porch ceilings, and mouldings in nominal widths from 1×4 up to 1×12, with actual dimensions that differ from traditional lumber by a small margin, which matters when the existing trim was cut to pine dimensions.
The compatibility gotcha we see on older Jacksonville remodels: a homeowner or a previous crew built an addition using Boral 5/4 trim stock, then years later a repair was done with standard dimensional lumber or a big-box PVC board. The profile lines don’t match, and the expansion behavior differs. When we walk a job, we’re looking for the Boral stamp on the board edge or back, or a product label on any leftover material in the garage. If no label survives, we measure the board’s actual thickness and the profile’s reveal, then match it against Boral’s published cut sheets. We’ll write the exact product name and part number into the estimate so you can verify it yourself.
OEM versus aftermarket matters less for Boral trim than it does for mechanical parts, because TruExterior boards are cut and routed in the field. The decision worth making carefully is the profile, not the brand. A 1×6 smooth trim board is not interchangeable with a 1×6 with a shiplap edge or a nickel-gap reveal, and getting that wrong produces a visible seam line that no amount of caulk hides. We stock common Boral smooth and nickel-gap profiles on our trailers for small repair scopes, and we order the less common profiles with a two-to-three-week lead time for full additions.
Styles & brands we work with
Signs Your Boral Home Additions & ADU Is Failing
- Swelling at butt joints. Boral poly-ash absorbs almost no moisture, so if trim is swelling at the seams, the usual cause is an installation error: boards were butted tight with no gap for seasonal movement, or the wrong fastener was used and it’s pulling the joint open. In our Avondale bungalow work, we see this on additions where the original crew used nails instead of the manufacturer-specified screws with plugs.
- Wavy trim lines along the fascia. This is a fastener and framing problem, not a material defect. If the underlying subfascia wasn’t straight or the boards weren’t fastened on the recommended centers, the trim follows the waviness over time. It’s fixable without replacing all the Boral, but it does mean pulling and re-securing boards.
- Paint peeling in sheets rather than wearing thin. Improper surface prep before painting is the usual cause here. Boral holds paint well when cleaned and primed per spec, but skipping that step on a Jacksonville addition that faces afternoon sun means the paint lets go in large flakes within a couple of years.
- Caulk lines cracking repeatedly at window and door trim. If you’ve re-caulked the same joint twice in eighteen months, the trim behind it is moving independently of the siding or the window frame. That means the original backer rod was omitted, or the joint is too large for caulk alone. The fix is re-setting the trim with proper spacing and a backer, not adding more sealant.
- Stone veneer panels pulling away from the wall at corners. This shows up on Boral Versetta Stone installs where the starter strip was mounted to a surface that wasn’t flat, or the fasteners missed the wall framing at the panel edges. A pulled corner is the early warning; ignored long enough, whole courses can come loose.
See the difference
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AfterReplacement Cost & What’s Included
For a Boral-focused home addition or ADU in Jacksonville, expect $45,000 – $130,000 for a completed addition and $90,000 – $220,000 for a full ADU. When the scope is a trim repair or exterior profile replacement rather than a new build, the work falls into a smaller range: re-trimming a gable end or a set of window surrounds typically runs $1,800 – $6,500 depending on height, access, and how much of the underlying framing needs correction.
Every estimate includes the Boral product named by part number or SKU, the labor broken into stages, and the written price before any work starts. That price does not change once the crew arrives. Our 365-Day Done Right Promise covers the completed work, and we include a photo of the clean-up before the crew leaves because we want you to see the job site the way we left it.
DIY or Call Us?
You can safely check a few things yourself: look for the Boral product stamp on board edges, photograph any exposed butt joints, and note which wall faces take the afternoon sun, since that’s where most Jacksonville failure patterns show first. What we don’t recommend is pulling trim boards off an exterior wall without knowing what’s behind them, because older Jacksonville additions sometimes hide wiring runs, shim stacks, or insect damage that changes the entire repair scope.
Working on a ladder at fascia height with a trim board in one hand is where most DIY repairs go wrong, and the fall risk is not worth the savings on a re-trim job. If you’re unsure what you’re looking at, call (904) 643-6243 and we’ll walk the property with you, identify the exact Boral profile, and put the scope in writing.
FAQs
Boral TruExterior trim carries a manufacturer warranty that runs for decades because the poly-ash material resists rot, moisture, and termite damage, and in Jacksonville’s heat and wet summers the material itself typically outlasts the paint job by a wide margin. What fails first here is almost always the installation: improper fastening, missing movement gaps, or skipped surface prep. When installed to spec, a Boral-trimmed addition in Jacksonville should need only repainting and re-caulking on a normal exterior maintenance cycle. Call (904) 643-6243 and we’ll inspect your existing trim and tell you whether the material itself needs replacement or just re-securing.
Yes, in many cases a section of Boral trim can be repaired or re-secured without replacing all the boards, especially if the issue is waviness from loose fasteners, cracked caulk joints, or paint adhesion problems. The repair scope depends on what we find behind the trim, and we’ll show you photos of the framing and fasteners before recommending a path. If replacement is needed, we match the existing profile so the repair doesn’t create a visible seam. Call (904) 643-6243 to schedule a walk-through and get a written price for the repair only.
A full Boral-specified home addition in Jacksonville typically runs three to six months depending on permitting, foundation work, and weather, while a detached ADU can run six to twelve months from plans through final inspection. Trim repair or exterior profile replacement on an existing addition is usually a two-to-four-day job once the correct Boral profiles are on site. We’ll name the material, name the day the dumpster arrives, and name the price before any work starts, so there is nothing left to wonder about. Call (904) 643-6243 for a project timeline specific to your property.
We stock common Boral smooth and nickel-gap trim profiles on our trailers for small repair scopes, and we order less common profiles with a two-to-three-week lead time for full additions and ADUs. If your existing addition used a specific Boral profile, we’ll verify the part number before ordering so the new material matches the old. We also work with KraftMaid, Cambria, and Silestone for the interior finishes, so the same crew can handle the entire addition without you coordinating multiple suppliers. Call (904) 643-6243 and we’ll check stock or order what’s needed.
Written by Graham Stein, Owner, Elmstead Remodeling Jacksonville at Elmstead Remodeling Jacksonville, serving Jacksonville and nearby areas.
