Laticrete Grout Calculator — Spectralock PRO & Permacolor Coverage Charts

The published chart runs the same joint-volume core this page does — tile ratio × joint depth × density — then subtracts a built-in job-site allowance of roughly 10–15% and assumes an 8 mm joint depth for its wall-tile rows. That is why a full SPECTRALOCK PRO unit prints as ~135 ft² on the chart for 12 × 12 in tile at 1/8 in joints, while pure joint volume computes 155 ft²: the chart is already carrying your waste factor. If your spreadsheet inputs the depth and waste honestly, the two converge to within a few percent.

One full unit mixes to ≈ 2.3 L of epoxy (≈ 4.3 kg at 1.9 kg/L). By pure joint volume that fills: 155 ft² of 12 × 12 in at 1/8 in joints (8 mm depth), 132 ft² of 12 × 24 in at 1/8 in (9 mm), or 42 ft² of 2 × 2 in mosaic at 1/16 in (6 mm). The half unit exists because Part A and Part B must react at full stoichiometry — halving the mix means halving both parts by weight, which the pre-portioned half unit guarantees.

Measured disagreement has three ranked causes: joint depth (8 mm chart assumption vs a real 9.5 mm floor tile adds 19%); pot-life loss (a full unit mixed at 27 °C sets in the bucket if the install stalls 40 minutes — an 8% unit loss); and temperature-thinned viscosity above 32 °C, which pushes epoxy deeper into the substrate and adds 3–5%. Fix depth first — it alone explains most chart-to-site gaps.

Yes — Permacolor Select on a periodically wet shower is a normal, code-conforming installation; keep ventilation and expect to maintain a penetrating sealer on a schedule. The epoxy question is different: a steam shower, a curbless wet room, or any niche that stays damp after the fan quits is where SPECTRALOCK PRO pays its premium back in zero re-sealing.

No — HYDRO BAN® PLASMA is LATICRETE's spray-applied waterproofing and crack-isolation membrane, not a grout. Its coverage math is wet-film based (liters per square meter, two coats), which is why grout coverage charts never list it. If you came from a search like 'laticrete plasma grout calculator', the number you want lives in the membrane data sheet — and this page's grout tools start after the membrane is on.

A 1-gallon pail holds 3.785 L ≈ 5.7 kg of premixed grout at 1.5 kg/L. By joint volume: about 248 ft² of 12 × 12 in at 1/8 in joints (8 mm), 126 ft² of 6 × 6 in at 1/8 in, and 114 ft² of 2 × 2 in mosaic at 1/16 in. Because it reseals, under-buying by one pail is a low-cost error to correct mid-job — the opposite of epoxy economics.

LATICRETE publishes coverage charts and estimator spreadsheets through laticrete.com rather than a dedicated mobile app. The charts are the authoritative source for contract quantities. This page is the faster in-browser route: it runs the same joint-volume arithmetic the spreadsheet hides in its cells, needs no download, and keeps working offline once loaded.

No. It is an independent tool, not affiliated with or endorsed by LATICRETE. Densities and product packaging follow LATICRETE's published data; consumption figures are computed from joint volume and clearly labeled. For contract or warranty work, verify quantities against the official coverage chart and the packaging label for the unit you buy.