Resource

Berkeley bathroom remodel terms, explained

Name: Berkeley Bath Co
Telephone: +15102832612
Price range: $$$

A remodel in a 1920s East Bay house has its own vocabulary: the contract language, century-old wiring and plumbing, seismic framing, and modern waterproofing systems. This page translates all of it into plain English, roughly in the order a project meets each term.

Allowance: A budgeted figure in the quote for something not yet chosen, tile, fixtures, the vanity top. A real allowance is a number you could go shopping against today. A vague one is where a fixed price quietly stops being fixed, so it is worth asking what a stated allowance buys in a Berkeley showroom.
Change order: A written, priced, signed amendment to the agreed scope. In pre-war Berkeley houses these are normal rather than a sign of trouble: demo exposes soft subfloor or dead galvanized branches, and the fix gets documented and decided before work continues. What matters is that it happens on paper, in advance, not as a line on the final bill.
Rough-in: The stage where the new plumbing, wiring, and framing changes are all in place but nothing is covered yet. It is the last moment the room can be changed cheaply, so it is the right time to walk it with the drawings and check that light boxes, the niche, and the valve height are where you want them.
Flood test: The shower pan gets plugged and filled with water, usually overnight, before any tile goes on. If the waterproofing leaks, this is when you find out, while the fix is a morning of work rather than a ceiling repair three years later. A contractor who skips it is skipping the only real proof the assembly holds.
Field measure: Measuring the finished opening rather than the drawing. Shower glass is field measured after the tile is set, because a hundred-year-old Berkeley wall is never as square as the plan says. The measurement then goes to the fabricator, which is why glass adds one to two weeks at the end of the schedule.
Punch list: The short list of remaining items walked at the end of the project: a paint touch-up, a cabinet door adjustment, one more bead of silicone. It gets written down together at the final walkthrough, and a well-written contract holds the last payment until it is cleared.
Contingency: A percentage of the budget, usually 10 to 15 percent on a pre-war Berkeley house, set aside for what demo turns up rather than spent on finishes at the start. It is not padding and it is not pessimism. Unspent contingency comes back to you; an unbudgeted surprise comes out of the tile you had already chosen.
Seismic retrofit: Foundation bolting, cripple-wall bracing, and framing connections that help an old wood-framed house ride out shaking from the Hayward Fault next door. Not bathroom work as such, but open walls make a remodel the cheap moment to strengthen the framing the bathroom touches.
Post-and-pier foundation: Wood posts bearing on concrete piers, the foundation under much of early Berkeley. The crawl space it creates is a gift to plumbers rerouting drains; the same structure is also first in line for seismic upgrading.
Knob-and-tube wiring: Pre-1940 electrical work: single conductors strung on ceramic knobs and run through ceramic tubes. Most unrenovated pre-war Berkeley houses still carry some. No electrician will extend it and no insurer likes finding it, so it comes out of the bathroom walls while they are open and access costs nothing.
Galvanized supply pipe: The zinc-coated steel water lines standard before the 1960s, which rust shut from the inside over decades, first as weak pressure, eventually as leaks. When a Berkeley remodel opens walls with galvanized branches inside, replacing them with copper or PEX is routine scope.
Lath and plaster: The wall construction of pre-war Berkeley: thin wood strips nailed across studs, coated in plaster. Harder and messier to demo than drywall, and part of why opening up a 1915 bathroom costs more than opening a 1975 one. Patching it in kind is a specialty skill; most remodels transition to drywall inside the bathroom.
Subfloor: The structural wood deck under the finish floor. Decades of small leaks around a pre-war tub tend to leave this layer soft, a condition nobody can see until demo. Partial replacement is common in older Berkeley bathrooms and normally arrives as a written change order.
Sistered joists: New framing lumber fastened alongside existing floor joists to stiffen or repair them. Berkeley remodels reach for sistering when hundred-year-old joists are undersized for a stone-heavy floor or a filled freestanding tub.
Blocking: Lumber set horizontally between studs so heavy things have something real to bite into: grab bars, wall-hung vanities, glass hardware. It goes in at rough-in, wherever the design will need it. Without blocking, a grab bar holds a towel, not a person.
GFCI outlet: The bathroom receptacle standard: a Ground Fault Circuit Interrupter cuts the power the instant current leaks to ground. It is the difference between a dropped hairdryer being an annoyance and being an emergency, and the same pass usually lands the room on a dedicated circuit of its own.
Schluter Kerdi: The orange sheet membrane on most higher-end East Bay shower jobs. Kerdi bonds over the wall assembly, folds through corners, and takes tile directly in thinset, waterproofing and tile substrate in one documented system.
Kerdi-Board: Schluter's foam board substrate with the waterproofing built in, replacing the cement-board-plus-membrane stack in a single step. Light to handle and consistent in result, it has become common in current shower builds.
RedGard: A paint-on waterproofing membrane from Custom Building Products, applied by roller or brush over cement board. Done right, built up in coats to the wet thickness the label calls for and checked with the gauge that ships with it, it performs well; the material is cheap and the outcome rides on the applicator's discipline.
Cement board (Durock, HardieBacker): The rigid backing panel behind wet-area tile, made of cement and reinforcing fiber. Moisture does not degrade it, but water passes through it, so a membrane always goes on before tile does.
Thinset: Cement-based mortar that glues tile to its substrate. The formulation has to match the tile: heavy large-format pieces slide during cure unless set in a medium-bed or LFT mix designed to hold them.
Grout: What fills the joints between tiles: cementitious for most work, epoxy where waterproof and stain-proof performance justifies the cost, shower floors especially. Where planes meet, wall to wall or wall to floor, the joint gets silicone instead, because in earthquake country those corners flex.
Curbless (or zero-entry) shower: No curb, no step: the shower floor continues flush from the bathroom floor. Berkeley's raised wood-framed floors mean the framing below must be recessed to create drainage slope, which adds $2,500 to $4,000 over a curbed build here. The default for aging-in-place designs and a growing choice in primary baths.
Linear drain: A trough-style drain running along one shower wall instead of sitting in the middle of the floor. Because the whole floor can then slope in a single plane, large-format tile becomes workable underfoot, something a center drain's compound slope rules out.
Niche: The recessed shampoo shelf tiled into a shower wall, framed between studs and waterproofed with everything else. Where it lands on the wall is settled at design rather than on site, because the framing and the membrane both have to be built around it before any tile goes on.
Bench seat: Built-in shower seating, framed and waterproofed to the same standard as the walls, spanning the shower or tucked in a corner. Aging-in-place designs treat it as essential; primary suites specify it for comfort.
Coefficient of friction (COF): How slip resistance gets measured in tile, and why a polished floor and a matte one behave so differently underfoot once they are wet. Reputable tile lines publish a wet rating on the spec sheet, which is what separates a tile that belongs on a bathroom floor from one that belongs on a wall.
Freestanding tub: A tub placed in open floor rather than an alcove, and a structural question in disguise: filled and occupied it parks a heavy load out in the middle of a floor span, where an alcove tub would have put most of it down along the walls. In pre-1930s Berkeley houses that usually means sistered joists or a beam below before it goes in.
Clawfoot tub: The freestanding cast-iron original found in many Berkeley Victorians and Craftsmans. Restorable (reglazing runs a few thousand dollars) and heavy enough to deserve the same framing review as any freestanding tub. Many owners keep one in a period hall bath and add a separate walk-in shower elsewhere.
Alcove tub: The familiar full-length tub boxed into three walls, standard issue across twentieth-century housing. Cheapest to swap like-for-like, and the usual starting point for a tub-to-shower conversion once bathing has moved on.
Pressure-balancing valve: The shower valve that holds temperature steady when someone flushes a toilet or starts the dishwasher, by balancing hot and cold pressure rather than volume. Almost every Berkeley conversion replaces the original valve with one, and because it sits inside the wall, it is the one fixture decision that cannot be revisited after tile.
Hex tile: Small hexagonal mosaic, the original floor of Berkeley's pre-war bathrooms. Modern porcelain versions arrive in mesh sheets, keep the period look, and pick up real slip resistance from their dense grout pattern.

Planning a bathroom remodel in Berkeley?

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