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FINISHES · DIVISION 09 30 00

Every waterproof
joint, checked.

Wet-area tile takeoff that reads the waterproofing detail. Curb LF, niche count, membrane SF, movement joints per TCNA EJ171, and DCOF ≥ 0.42 slip rating on every wet surface. Signed by a senior estimator.

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20-40 minvs 50+ hrs manual
ANSI A118membrane verified
DCOF ≥ 0.42wet · exterior
Pain · Preqonn

What tile bidding
actually feels like.

Four ways wet-area tile bids go wrong on real jobs. Four ways we already fixed it.

Pain · Wet-area takeoff

Niches, curbs, and trim don't sum off plan SF.

You're reading shower details, curb geometry, bench profiles, and Schluter trim LF across three sheets. Niche count is buried in elevations. Plan SF doesn't include the vertical wall tile, the bench cap, or the bullnose return. Half the line items get added by hand at 11pm.

Source · A-6.10, A-6.11 details + 09 30 13 spec
Preqonn · Wet-area reader

Curbs, niches, benches, and trim LF resolved.

Every wet area is unfolded into floor SF, wall SF, niche count, curb LF, bench cap LF, and bullnose/quarter-round LF. The Schluter trim schedule maps to elevation sides. Vertical wall tile is its own line, not absorbed into floor SF.

Output · wet-area takeoff + trim schedule
Pain · Membrane miss

Wrong membrane = mold remediation.

The shower pan spec calls for an ANSI A118.10 bonded waterproof membrane. The sub priced a vapor-retarding crack-isolation mat instead. Leak path opens at month nine. Full tear-out plus mold remediation, drywall, framing, and the unit below. Litigation follows.

Cite · ANSI A118.10 / A118.12 · 07 14 00
Preqonn · Membrane gate

ANSI A118 verified under every pan.

Every shower pan and wet wall gets a membrane line cross-checked against ANSI A118.10 (bonded) or A118.12 (load-bearing). Sheet vs. liquid is gated against the cited spec section. SF tied to wall + floor + curb perimeter. Conflicts flag with the section reference before bid leaves.

Output · membrane SF · ANSI cert ref
Pain · Layout waste

Cuts around drains and accents eat margin.

The 12×24 plank tile is set in a 1/3-running bond. Drains, niches, decorative bands, and the transition to the bath floor each force a cut row. Real waste on this job is 14-18%. Your sub priced 8%. The first delivery short-ships the bid.

Cite · TCNA Handbook · F125 / B415
Preqonn · Layout-driven waste

Waste per room from the actual layout.

We lay every tile against the spec'd pattern (running bond, 1/3 offset, herringbone, basketweave), then compute waste from real cuts around drains, niches, accent bands, and pattern changes. Movement joints per TCNA EJ171 drop in as LF. Per-room waste, not a 10% guess.

Output · layout PDF + waste per room
Pain · DCOF / ADA slip

0.42 DCOF missed at the wet door.

Spec calls for DCOF ≥ 0.42 per ANSI A137.1 at wet and exterior locations. The sub picked a beautiful polished porcelain at 0.38 because the showroom sample said "commercial." Code official rejects at CO walk-through. Re-order, re-set, re-grout. Schedule slips two weeks.

Cite · ANSI A137.1 · ADA §302 / §303
Preqonn · Slip rating gate

DCOF enforced at every wet line.

Every tile SKU is gated against the room's slip requirement. DCOF ≥ 0.42 at wet, ≥ 0.42 + texture at exterior, ADA §303 transitions verified at door thresholds. Failed SKUs are flagged with the section reference and ranked alternates from the same manufacturer.

Output · slip rating per room · alternates
How the wet-area takeoff is built

Pan to perimeter.
Every joint accounted for.

Four stages, in the order an estimator who's tiled a thousand showers would work. Scroll to advance.

  1. STEP 01

    Wet area outlined.

    Shower, tub deck, and curb perimeter extracted from plan plus details. Tile pattern locked to the spec.

  2. STEP 02

    Membrane SF populates.

    ANSI A118.10 bonded waterproofing applied to floor, walls, and curb perimeter. Square footage reconciled to the cited assembly.

  3. STEP 03

    Niches, curb LF, drain count.

    Every niche counted with size. Curb LF measured. Drain count and slope-to-drain (1/4"/ft) verified.

  4. STEP 04

    Movement joints + DCOF.

    Movement joint LF per TCNA EJ171. Slip rating gated to DCOF ≥ 0.42 at wet and exterior. Tested-assembly cert pulled live.

Tile · DCOF · Membrane

The matrix
per wet line.

Every tile SKU auto-mapped to its room, slip rating, membrane class, and trim. The estimator sees the conflict before the bid leaves.

Room · location Tile · pattern DCOF Membrane (A118) Trim · LF Mvmt joints Status
Bath 03B · ShowerWet · 38.4 SF floor 12×24 plank · 1/3 RB 0.48 wet A118.10 bonded Bullnose · 27.7 EJ171 · 14 LF Verified
Bath 03B · FloorDry · 56.2 SF 12×24 plank · 1/3 RB 0.48 wet A118.12 crack iso Schluter · 18.0 EJ171 · 22 LF Verified
Pool deck · L01Exterior · 1,840 SF 24×24 textured 0.42 wet (spec'd 0.60) A118.12 + EOTH Bullnose · 184 LF EJ171 · 96 LF DCOF · spec 0.60
Locker rm · gang showerWet · 312 SF 2×2 mosaic · grid 0.62 wet A118.10 sheet Cove base · 88 LF EJ171 · 42 LF Verified
Kitchen splash · L02Vertical · 96 SF 3×12 subway · stack N/A · vertical None · dry zone Bullnose · 42 LF EJ171 · 0 Verified
Code · Spec · Cert

Auto-checked
against the standards that fail bids.

Every tile line passes through the same eight checks every senior tile estimator runs. Citations included with the BOM.

0codes auto-checked per bid
0membrane SF reconciled to A118
0DCOF gating at BOM
Compliance log · BID #PQ-0731 LIVE
ANSI A108 · Installation methodsSet materials, bond coverage, open-time per substrate
PASS
ANSI A118.10 · Bonded waterproof membraneShower pan + walls, perimeter return, 168.2 SF verified
PASS
ANSI A118.12 · Crack isolationFloor field with substrate movement, dry zones gated
PASS
ANSI A136 · Organic adhesivesWall-tile dry zones only, never below grade or wet
PASS
TCNA Handbook · B415 / F125Wet area methods cross-referenced to detail callouts
PASS
TCNA EJ171 · Movement jointsField LF, perimeter, change-of-plane reconciled per room
PASS
ANSI A137.1 · DCOF ≥ 0.42Wet and exterior locations · SKU-level gating at BOM
PASS
ADA §302 / §303 · Floor + transitionPile, beveled edge ≤ 1/2", level changes verified at thresholds
PASS
Trade FAQ

The tile questions
before the demo.

What every tile bidder actually asks us.

Yes. We unfold each wet area into floor SF, wall SF, niche count, curb LF, bench LF, and bullnose / quarter-round LF. The shower pan detail, slope-to-drain, and waterproofing perimeter are all extracted. Vertical wall tile is its own line, never absorbed into floor SF.
Every shower pan and wet wall gets a membrane line cross-checked against A118.10 (bonded waterproof) or A118.12 (crack isolation), depending on what the spec section actually requires. Sheet vs. liquid is gated against the cited assembly. If the sub priced a crack-iso mat where a waterproof membrane is required, we flag it with the spec reference before bid day.
Yes. We lay every tile against the spec'd pattern (running bond, 1/3 offset, herringbone, basketweave, stack) and compute waste from real cuts around drains, niches, accent bands, and pattern changes. Per-room waste, not a flat factor. Movement joints per TCNA EJ171 drop in as LF in field, perimeter, and change-of-plane.
DCOF is enforced at the SKU level. Every tile is gated against ANSI A137.1 ≥ 0.42 at wet, and the spec'd higher tier where called for (pool decks, exterior, commercial kitchens often spec 0.60). ADA §302 surface and §303 transitions get verified at every door threshold and material change. Failed SKUs flag with section reference and ranked alternates from the same manufacturer.
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See it work on your live bid.

20-minute demo. Bring a real PDF. We'll run it through Preqonn AI and walk the output.

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