InstaBidsTypes of grout?
Grout choice starts with joint width: TCNA directs traditional unsanded cement below 1/8 inch and sanded cement at or above it. For sealing and return-to-use tradeoffs, Prism needs no sealer and is walkable in four hours; SPECTRALOCK PRO Premium epoxy absorbs below 0.05%. Shower waterproofing remains a separate choice. (source: Tile Council of North America)
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Grout types: joint fit, installation and care
| Options | Material and decision number | Selection check | Care commitment |
|---|---|---|---|
| Traditional unsanded cement | TCNA guidance for joints smaller than 1/8 inch. | Start here for narrow joints; check the tile and exact formulation. | Use a cement-compatible cleaner; acids can dissolve cement. |
| Traditional sanded cement | TCNA guidance for joints 1/8 inch and larger. | Above 3/8 inch, TCNA points to more heavily sanded grout. | Sand can scratch susceptible tile finishes; resolve compatibility first. |
| High-performance cement | Prism example: ANSI A118.7; walkable in four hours. | Prism permits intermittent water exposure after 3 days. Walking time is a different milestone. | Prism requires no sealer; cement formulation alone does not settle the sealing question. |
| Epoxy | SPECTRALOCK PRO Premium example: absorption below 0.05%. | Published joint range: 1/16 to 1/2 inch. LATICRETE epoxy contains sand. | No grout sealing required for this LATICRETE epoxy; full stain resistance takes 7 days at 70°F. |
| Single-component premixed | Fusion Pro Designer Series example: single-component, no mixing. | A handling choice: name the exact product rather than specifying only “premixed”. | Fusion Pro Designer Series requires no sealing. |
Cure milestones: compare like with like
| Options | Published interval | What that interval means |
|---|---|---|
| Prism foot traffic | Four hours. | Walkable; intermittent water exposure is a separate 3-day milestone. |
| LATICRETE epoxy shower use | 48–72 hours at 70°F. | SPECTRALOCK PRO Premium full stain resistance takes 7 days at 70°F. |
| Prism exterior protection | At least 72 hours above 50°F. | Protect from rain, snow and other wet conditions during this period. |
Match grout curing to exposure and site temperature
Exterior cement-grout curing
Prism requires protection from rain, snow and other wet conditions for at least 72 hours above 50°F. This is a product installation requirement, not a ranking of grout families by climate.
Indoor shower return to use
LATICRETE’s epoxy shower-use interval is 48–72 hours at 70°F. Full stain resistance for SPECTRALOCK PRO Premium takes 7 days at that temperature.
What grout to use in shower?
Shower grout should be selected with its wet-use cure time written down. LATICRETE gives 48–72 hours at 70°F before shower use for its epoxy guidance, while SPECTRALOCK PRO Premium needs 7 days for full stain resistance (read 2026-11-09). Grout selection also leaves the shower waterproofing system to specify separately.
Prism’s published intermittent-water interval is 3 days even though the floor is walkable in four hours. Ask the installer to distinguish foot traffic, water exposure and stain resistance in the handover notes. A quick walking time should never stand in for the wet-use instructions.
You can put those return-to-use requirements in an InstaBids job request.
Source: Prism Ultimate Performance Grout TDS-128, read 2026-11-09
Source: Epoxy Grouts FAQ, read 2026-11-09
Source: Epoxy Grout: Everything You Need to Know, read 2026-11-09
What grout to use for glass tile?
Glass tile needs a grout compatibility decision alongside joint width. TCNA warns that sand can scratch susceptible surfaces; LATICRETE confirms its epoxy grouts contain sand and lists a 1/16-to-1/2-inch range for SPECTRALOCK PRO Premium (read 2026-11-09). Narrow-joint capability alone does not establish compatibility with a delicate tile finish.
Ask for the tile supplier’s grout recommendation and a sample before choosing a sand-containing formulation. TCNA’s traditional cement guidance separates unsanded joints below 1/8 inch from sanded joints at or above that width. Product-specific instructions still need to match the selected tile.
Use the request description to name your glass tile and the proposed grout.
Source: Grout FAQ, read 2026-11-09
Source: SPECTRALOCK Grout FAQ, read 2026-11-09
Source: Epoxy Grouts FAQ, read 2026-11-09
Which grout is waterproof?
Grout does not provide the waterproofing for a tiled installation, according to LATICRETE’s epoxy guide (read 2026-11-09). SPECTRALOCK PRO Premium’s published absorption below 0.05% describes the grout material. A water-resistant joint filler and a waterproofed shower assembly are separate specification decisions.
LATICRETE recommends a waterproofing membrane over the substrate when waterproofing is needed. Request the proposed waterproofing system independently of grout color or resin type; the choice of epoxy does not remove that question.
A written request can ask bidders to describe grout and waterproofing separately.
Source: SPECTRALOCK Grout FAQ, read 2026-11-09
Source: Epoxy Grout: Everything You Need to Know, read 2026-11-09
Does grout need to be sealed?
Grout sealing depends on the formulation. Prism’s cement-grout sheet says no sealer is required, LATICRETE says its epoxy grouts require no sealing, and Fusion Pro Designer Series also needs none (read 2026-11-09). Prism’s four-hour walking time is an installation milestone, not a universal sealing or maintenance schedule.
Avoid specifying a recurring resealing interval for every grout family. Obtain the exact grout’s care instructions and keep the adjacent tile’s needs separate. For cement grout cleaning, American Cleaning Institute cautions that acids can dissolve the cement; cleaner compatibility belongs in the care plan.
Attach the selected product’s care instructions to the scope you post.
Source: Prism Ultimate Performance Grout TDS-128, read 2026-11-09
Source: Epoxy Grouts FAQ, read 2026-11-09
Source: Fusion Pro Designer Series, read 2026-11-09
Source: Ask ACI: How do I clean grout?, read 2026-11-09
Is epoxy grout easier to clean?
Epoxy grout can reduce absorption and remove a grout-sealing task, but product cure limits still matter. LATICRETE reports absorption below 0.05% for SPECTRALOCK PRO Premium and full stain resistance after 7 days at 70°F (read 2026-11-09). A shower-use interval should not be mistaken for full resistance to staining products.
For cement grout, American Cleaning Institute recommends an alkaline cleaner, time for the product to work, then scrubbing and rinsing. LATICRETE identifies powdering, dusting and flaking as possible cement-grout curing problems; those signs deserve a material assessment instead of a stronger cleaner.
Compare the cleaning instructions supplied with each written grout proposal.
Source: SPECTRALOCK Grout FAQ, read 2026-11-09
Source: Epoxy Grouts FAQ, read 2026-11-09
Source: Ask ACI: How do I clean grout?, read 2026-11-09
What to put in your written grout scope
- Identify the exact grout family, manufacturer and product; distinguish premixed single-component from mixed epoxy.
- Record the actual joint width between tile edges, excluding the beveled edge.
- Check traditional sanded or unsanded selection against the 1/8-inch joint threshold.
- For a wide joint above 3/8 inch, record the proposed grout formulation.
- Resolve scratch compatibility for glass and delicate finishes, including sand-containing epoxy.
- Show the movement joints separately: TCNA calls for caulk where backing surfaces change.
- Name the shower waterproofing assembly separately from the grout.
- List foot traffic, intermittent-water and stain-resistance milestones separately.
- Include product-specific care instructions, sealing requirements and cement-compatible cleaners.
Sources
- Grout FAQ — Tile Council of North America; undated; read 2026-11-09.
- Prism Ultimate Performance Grout TDS-128 — CUSTOM Building Products; 2026-01-09; read 2026-11-09.
- SPECTRALOCK Grout FAQ — LATICRETE; undated; read 2026-11-09.
- Epoxy Grouts FAQ — LATICRETE; undated; read 2026-11-09.
- Epoxy Grout: Everything You Need to Know — LATICRETE; 2025-06; read 2026-11-09.
- Fusion Pro Designer Series — CUSTOM Building Products; undated; read 2026-11-09.
- Ask ACI: How do I clean grout? — American Cleaning Institute; undated; read 2026-11-09.
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