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Oldcastle Bathroom Remodeling: The San Antonio Owner’s Guide
We install and service Oldcastle-compatible bathroom remodeling components in San Antonio, with full bathroom remodels typically running $9,000 to $28,000 depending on scope, materials, and what’s behind your walls once we open them up. If you’ve got a failed shower pan, a leaking curb, or tile that’s starting to pull away from an Oldcastle substrate system, we can usually diagnose it within the first visit. Most San Antonio homeowners call us after noticing water stains on the ceiling below the bathroom or grout that stays dark and wet in the corner of the shower, and by then the failure has usually been working quietly for months. Oldcastle’s cementitious backer boards and shower systems are solid products, but they fail like anything else when installed incorrectly, when the waterproofing layer gets compromised, or when a San Antonio home’s shifting clay soil translates into micro-movement that cracks rigid assemblies. This page covers what fails, what it costs to fix, and how to know whether you’re looking at a repair or a full redo.
- Typical installed range in San Antonio: $9,000 – $28,000 for a full Oldcastle-compatible bathroom remodel; smaller targeted repairs often less.
- What we actually do: match the right Oldcastle-spec board, pan, and membrane to your existing assembly, then install it correctly so the next failure doesn’t happen.
- What to do right now: call (254) 269-5071 and describe what you’re seeing. A live person answers, not a phone tree.
Which Oldcastle Models This Applies To
Oldcastle doesn’t sell a single “bathroom system” the way a shower-kit company does. What most San Antonio homeowners have without knowing it is one of several Oldcastle-sourced substrates or moisture-management components buried behind their tile. The common ones we see are the Oldcastle APG/Hydroment cementitious backer units, mud-bed mixes, and pre-sloped shower pan systems used by production builders and custom tile setters around San Antonio through the 2000s and 2010s. The compatibility gotcha that trips people up: Oldcastle’s backer board lines changed density and fastener-hold specs when they moved through different APG product generations, so the board in a 2008 bathroom is not always a straight swap for what you’ll find on a shelf today. If you can still see the stamp on the back of a removed tile or on an exposed edge, look for the thickness marking (typically 1/2 inch) and any batch code. That’s usually enough for us to identify what’s behind your walls before we even cut into them. On the decision between OEM spec and quality aftermarket equivalents, our rule is simple: for anything in the waterproofing layer, we use Oldcastle-compatible or specified-tested materials rather than whatever the big-box store has on sale, because the labor to redo a failed mud bed costs ten times the difference in material price.
Styles & brands we work with
Signs Your Oldcastle Bathroom Remodeling Is Failing
- Shower pan flex or bounce underfoot. This usually means the mortar bed beneath the pan has decomposed or was mixed too wet at install. The pan loses its bearing, cracks follow, and water finds a way down. In San Antonio, we see this most in homes built during the fast-expansion years when production quality varied hard.
- Dark, persistently wet grout at the shower base. Grout darkens when water is trapped behind it and wicking through. If it stays dark 24 hours after the shower ran, the waterproofing has been breached and the grout is just a sponge holding water against the board.
- Damp smell in a bathroom that gets cleaned regularly. That smell is mold and bacteria growing in a permanent water source behind the tile. By the time you smell it, the failure is well underway and the wood framing behind the shower is likely wet.
- Cracked or efflorescing tile around the drain or at the curb. Efflorescence, the white chalky deposit, is dissolved minerals being carried to the surface by water moving through the assembly. It means water is migrating through the bed and pulling the mud apart as it goes.
- Water damage on the ceiling of the floor below. This is the one we wish people called about the day they saw it. By the time water has traveled through the floor assembly and stained drywall below, the shower pan or curb has been leaking for months and the repair scope just got bigger.
See the difference
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AfterReplacement Cost & What’s Included
A full Oldcastle-compatible bathroom remodel in San Antonio lands between $9,000 and $28,000 installed, and the spread is real. The low end covers a compact 5×8 bathroom with a standard tub or shower replacement, basic tile, an off-the-shelf vanity, and no plumbing relocation. The high end covers a larger primary bath where we’re moving drains, building a custom walk-in shower, replacing the substrate down to the studs, and installing plumbing fixtures from brands like Kohler or Moen. What drives the number isn’t mystery markup, it’s what’s behind the walls once we open them, whether the joists have been sitting in water, and whether the layout changes require relocating the drain stack. Every quote from Mason Remodeling Co San Antonio is a written price delivered before any work starts, so you’ll know the exact figure, not a verbal range that grows later. Our work is covered by a 365-day Done Right Promise from the completion date: if something isn’t right within a year, we return and make it right at no cost to you.
DIY or Call Us?
There’s honest DIY work here and there’s work you shouldn’t touch. You can safely shut off the water to the bathroom, dry out visible moisture, run a dehumidifier, stop using the shower, and peel back any loose caulk to inspect what’s going on. You should not, and this is our plain advice, start cutting open a tile shower wall that sits over an Oldcastle mud bed if you don’t know how that assembly was built. Mud beds are heavy, the waterproofing layers are specific, and a homeowner who removes tile without understanding what’s underneath can turn a $3,000 pan repair into a $18,000 full rebuild with one wrong cut. The dangerous part here isn’t springs or electricity, it’s unknowingly creating a path for water to keep doing damage while you think you’re investigating. If you see the signs above, call (254) 269-5071. We’ll send someone who has done this exact job in San Antonio more times than they can count, and they’ll tell you where you actually stand before anyone picks up a saw.
FAQs
A properly installed Oldcastle-spec shower assembly with intact waterproofing should last 20 to 30 years in San Antonio’s climate, though the grout, caulk, and shower valve components will need maintenance long before the substrate fails. What shortens that lifespan here is our freeze-thaw-adjacent temperature swings, hard water from the Edwards Aquifer that saturates grout, and houses sitting on expansive clay that moves more than homeowners realize. Call (254) 269-5071 for an inspection if your bathroom is 15 or more years old and you’re seeing any of the signs above.
In some cases yes, when the failure is localized to the drain assembly or a curb corner and the pan itself is structurally sound, but most San Antonio failures we see involve the waterproofing layer, which means the repair is a partial or full rebuild of the pan and lower wall assembly. We’ll always tell you the repair option first when it’s credible, because we’d rather earn your trust on a smaller job than push a bigger one. Call (254) 269-5071 and describe what you’re seeing, and we’ll give you a straight answer.
A full Oldcastle-compatible bathroom remodel in San Antonio typically takes 3 to 5 weeks from demo to fixture trim, with the substrate and waterproofing work happening in the first week and half. A pan replacement or targeted repair can often be done in 3 to 5 working days. We’ll put the schedule in your written quote before work begins, so you know what to expect instead of wondering.
We keep Oldcastle-compatible backer boards, mortar bed materials, and standard drain assemblies on our trucks for the most common San Antonio shower and tub configurations. For less common or discontinued Oldcastle-spec components, we source through our material partners and can typically have what’s needed on site within days. Mason Remodeling Co San Antonio is an independent service provider and not affiliated with Oldcastle, but we work with their components because we know them well enough to install them right.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Antonio at Mason Remodeling Co San Antonio, serving San Antonio and nearby areas.
