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Tamko Bathroom Remodeling: The San Jose Owner’s Guide
If your bathroom has a Tamko product that’s failed or is failing, here’s the straight answer: we install Tamko-compatible bathroom remodeling work across San Jose for $10,620 – $33,040, and we’ll have a written price in your hand before any work starts. That range covers tear-out, new substrate, waterproofing, and finish work matched to your existing Tamko product line. Most owners discover the problem the same way: grout cracking in the corners, a soft spot under the flooring, or water stains on the ceiling below the bathroom.
We’re an independent remodeling contractor in San Jose. We’re not affiliated with Tamko, and we don’t pretend to be. What we do is know how their roofing underlayment, waterproofing membranes, and flashing systems behave in California’s dry-wet-dry cycle, and how to tie adjacent bathroom work into those products without creating new failure points. Curtis Lane and our crew have done enough tear-outs in San Jose houses to know what’s behind a tile wall before the first hammer swings.
Which Tamko Products This Applies To
When most San Jose homeowners say “Tamko bathroom,” they’re usually pointing at one of three things: Tamko’s waterproofing membrane under a shower pan or behind a tile wall, Tamko flashing at a window or exhaust vent penetration, or a TubSeal-style product around the tub flange. These are all building-envelope products, not finished surfaces. The failure usually shows up as tile work failing, but the root cause is often what’s behind the tile.
Here’s the compatibility gotcha every San Jose homeowner should check before buying parts: Tamko membrane products are spec’d by mill thickness and exposure rating, and the big-box aftermarket sheets don’t always meet Tamko’s 40-mil minimum for low-slope transitions. In a bathroom, that transition is the curb-to-pan junction, which sees standing water after every shower. A thinner generic sheet installed there can fail in two to three years in a humid San Jose winter. We match the OEM spec, not whatever’s cheapest on the shelf.
The right way to identify what you have: pull the escutcheon plate off your shower valve and look for a printed product code on the membrane edge, or check the original building permit file if you have it. If you can’t find a code, one of our techs can identify the product during the estimate. The parts we source are OEM Tamko where available, and we’ll show you the manufacturer label before anything gets installed.
Styles & brands we work with
Signs Your Tamko Bathroom Waterproofing Is Failing
- Grout cracking at the pan-to-wall corner within the first two years. That joint moves. If the waterproofing behind it is pulled tight instead of lapped into the pan, the movement tears the membrane. We see this most in San Jose homes built on clay soil, which shifts seasonally.
- Water stains on the ceiling below the bathroom, especially after heavy rain. That’s almost always a pan leak or a failed exhaust vent flashing. The water travels through the subfloor before it shows, so the stain you see is behind the actual damage.
- Musty smell that won’t clear even with the fan running. Moisture is trapped behind the tile, and the substrate is holding it. Once mold gains a foothold in gypsum board, the fix is full removal, not a recoat.
- Floor tile lifting or sounding hollow underfoot. The substrate has delaminated from the subfloor. In a ground-floor San Jose bath, this often traces to a failed moisture barrier over a crawl space or slab.
- Caulking that darkens within weeks or months of a reseal. Water is being pulled through from behind, and the caulk is the only thing absorbing it. That’s not a caulk problem; it’s a waterproofing problem.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
A Tamko-related bathroom repair or remodel in San Jose runs $10,620 – $33,040 installed. On the lower end, that’s a shower pan replacement with new Tamko membrane, new tile in the wet zone, and a resurfaced substrate. On the higher end, you’re looking at a full bathroom tear-out: new waterproofing from studs to curb, new drain assembly, new flooring, and finish work matched to the rest of the room.
What drives the spread: access (ground-floor slab vs second story), how far the water damage extends, and whether the framing under the pan needs repair. Labor is the biggest share of the cost. The membrane itself is inexpensive; the hours to do it right are not. You get a line-item written quote before we start, and if the number changes, it changes on paper first, not at the door. Every Tamko-related repair we install is covered by our 365-Day Done Right Promise: if it fails within the year, we return and correct it at no charge.
DIY or Call Us?
Some of this you can check yourself. Run the shower for ten minutes, then press a moisture meter against the grout lines at the base. Take a flashlight into the crawl space and look at the subfloor from below. If you’re comfortable removing the shower valve trim, you can inspect the membrane edge for cracks or gaps. Stop there.
What you should not do is pull up tile to “see what’s going on.” Once you break the waterproofing layer, you’ve turned a possible repair into a full remodel, and a flooded bathroom in a San Jose neighborhood will find its way into the room below fast. Water in a wall cavity is patient; it waits until you’ve closed everything back up. If you’ve found visible water damage, call us at (669) 272-2637. We’ll tell you honestly whether it’s a repair or a gut, and the estimate costs you nothing.
FAQs
Fifteen to twenty years under normal use when installed to spec and not poked through during tile work. San Jose’s dry summers and wet winters put stress on the bond at the pan-to-wall junction, so that’s where age shows first. Call (669) 272-2637 for an inspection if your bath is older than fifteen years.
Small tears at screw penetrations can sometimes be patched with a compatible membrane and proper lap sealant, but once water has saturated the substrate under the pan, the repair won’t hold. A saturated pan base will keep wicking moisture into surrounding framing. We’ll cut a small inspection opening to check before recommending a full replacement.
Most pan replacements and wet-zone repairs in San Jose run three to five working days. A full bathroom tear-out to studs and rebuild runs two to three weeks depending on tile selection and fixture schedule. We give you a written schedule with the written price, and it holds unless you change the scope.
We stock Tamko membrane in the common roll widths along with pan corners, drain flashing, and sealant on most trucks headed to a known bathroom job. If your project requires a special-order width or a specific product number, we’ll have it staged at our San Jose yard before your start date. No job starts waiting on parts.
If you need Tamko-compatible bathroom remodeling in San Jose, call us at (669) 272-2637 for a free estimate. Straight number, written scope, done when we said done.
Written by Curtis Lane, Owner, Bradford Remodeling Co at Bradford Remodeling Co San Jose, serving San Jose and nearby areas.
