A cut-to-size order saves site cutting only when its dimensions come from a verified survey, finished construction levels, and approved shop drawings. You will be able to measure the space, calculate a realistic order quantity, control tolerances and appearance, and coordinate fabrication with installation so the tiles fit the completed project rather than an unfinished one.
Key takeaways
- Measure after screed, waterproofing, trims, and plaster are complete.
- Give fabricators a tile schedule with dimensions, quantities, edges, and reference numbers.
- Calculate waste, thickness, finished levels, thresholds, and adjoining floor transitions.
- Approve stone, shop drawings, dry layouts, and installation controls before cutting.
Measure the Finished Installation Area, Not Just the Room
Measure after screed, waterproofing, plaster, and fixed edge trims are complete, then recheck before fabrication. A granite tile measurement taken from structural walls alone can fail when the finished surface moves inward, changes level, or reveals an out-of-square corner.
Your site survey should record:
- Finished room length and width at several points, not one reading at each wall
- Wall squareness, diagonals, and the narrowest and widest dimensions
- Alcoves, columns, niches, service penetrations, floor drains, and fixed equipment
- Door thresholds, skirting lines, stairs, ramps, and every change in level
- Substrate high and low points, finished floor height, and the route for moving large pieces
- Required grout joints, movement joints, edge profiles, and areas needing site trimming
Use approved shop drawings to confirm the survey before cutting. Measure walls after plaster and floors after the final build-up; otherwise, a precise workshop cut can be wrong on installation day.
Nominal size and finished size are not interchangeable:
| Term | Meaning | Risk if confused |
|---|---|---|
| Nominal size | The labelled tile dimension, such as 600 × 600 mm | The actual piece may not leave the planned grout joint |
| Finished size | The measured cut dimension delivered by the fabricator | A joint, bevel, or edge profile may reduce the visible face |
| Set-out dimension | The space available between walls, openings, or trims | Out-of-square areas can force tapered cuts or replacement pieces |
Confirm the fabricator’s dimensional tolerance in millimetres and allow measured site variation before release. Recheck the first installed row before continuing.
Build a Tile Schedule That Fabricators Can Check
Each row in the tile schedule must identify one repeatable piece, its finished dimensions, and its exact position. Fabricators cannot safely work from “600 mm tiles for the lobby” when openings, borders, and walls differ.
1. Assign a tile code and location, such as L-01 for lobby tile 01 or B-04 for bathroom wall tile 04. Record length, width, thickness, quantity, and installation orientation for every code.
2. State nominal size versus actual size. A tile sold as 600 × 600 mm may require a smaller finished dimension to create specified grout joints; write the actual cut size, not only the product description.
3. Record the grout joints separately from movement joints. Perimeter joints, changes of plane, structural joints, and large uninterrupted fields need a sealant or designed movement-joint system through the granite and setting bed, not rigid grout.
4. Specify the visible finish and direction: polished, honed, flamed, leathered, vein or grain direction, and the face that must remain exposed. Note the approved shade, batch, and mock-up reference because granite can vary between blocks.
5. Describe every exposed edge: square, eased, bevelled, bullnosed, or unfinished. Confirm whether dimensions include the edge profile, and require checks for squareness, chips, and the stated dimensional tolerance.
Attach a checked drawing showing drains, penetrations, thresholds, alcoves, and cut-outs. Leave only the agreed site-adjustment allowance; additional adhesive will not correct a bowed or uneven substrate. The fabricator should flag any conflict before cutting.
Calculate Quantity, Thickness, and Finished-Level Requirements
Order quantity from the approved layout, not the room’s gross area. For the granite tile quantity calculation, divide the net installation area by the actual finished face area of one tile, including the planned grout joint only when the layout drawing uses module dimensions.
Add a cutting reserve based on the pattern, then keep replacement pieces from the same batch.
1. Record the actual tile length and width, not the nominal size printed on the quotation. Confirm whether dimensions exclude grout joints, bevels, edge profiles, or movement joints; otherwise, the last row can become too narrow.
2. Specify tile thickness from the finished-level build-up: substrate, screed, waterproofing, adhesive, and granite. Compare this total with adjacent flooring before fabrication. A mismatch at a material transition creates a trip edge or an improvised ramp.
3. Check door clearance with the doors installed or their final swing dimensions. Include tile thickness, adhesive, and any threshold strip; a floor that rises by a few millimetres can make a door scrape or prevent it from opening.
4. Measure separate quantities for skirting and stair nosing. Skirting needs height, length, internal and external corners, and return pieces; stair nosing needs tread depth, riser height, overhang, and the finished edge profile. Do not treat these pieces as leftover floor tiles.
Use a dry layout to locate shade changes, natural bowing, thickness variation, high-low transitions, and repaired fissures before adhesive. Reserve extra pieces for visible cuts, stairs, and future repairs rather than hiding a shortage at a doorway.
Coordinate Fabrication With Construction and Installation
Do not release cut-to-size granite for installation until the substrate, surrounding finishes, and site conditions match the approved drawings. A precise workshop cut cannot correct an unfinished screed, a shifted doorway, a wet waterproofing layer, or a wall that has changed after plastering.
1. Coordinate screed and plaster coordination before the final site check. Confirm finished floor levels after screed, waterproofing, adhesive, and tile thickness are established; complete wall plaster before fixing wall pieces. Record any change that affects thresholds, skirting, niches, drains, or edge trims.
2. Test the installation surface with a straightedge and correct humps, hollows, loose areas, and an uneven screed before delivery. Do not use extra adhesive to hide major defects. Long or large-format pieces will rock, show lippage, or crack when the substrate is not flat.
3. Confirm waterproofing has cured and passed its inspection before laying granite in wet areas. Protect the membrane from later trades, and do not cover access points until drains, falls, and penetrations have been checked.
4. Mark movement joints on the approved layout, including perimeters, structural joints, changes of plane, and large uninterrupted fields. Carry them through the tile and setting bed; rigid grout across a movement joint can force tiles to crack or debond.
5. Install a small test panel to confirm adhesive colour, curing, moisture behaviour, and appearance. Check mortar coverage beneath every piece, targeting at least 80% in dry interiors and 95% in wet or exterior areas, with full support at edges and corners.
6. Keep spare pieces and a controlled area for site trimming. Openings, damaged tiles, out-of-square conditions, and late dimensional changes still create unfinished work even after workshop fabrication.
Approve the Stone, Shop Drawings, and Installation Controls
Do not release the order until the actual slabs, approved shop drawings, and installation sample agree. Inspect colour, veining, grain direction, surface finish, thickness, edge treatment, repaired fissures, bowing, and the marked finished dimensions; a hard stone can still vary between blocks.
1. Record granite batch approval against the selected slabs or clear photographs of them. Confirm that every tile comes from the agreed batch, with shade and grain orientation marked on the packing list. Jaishree Stones can help document this approval before fabrication if the order includes several rooms or replacement pieces.
2. Ask for the applicable test reports, not a claim that the material is simply granite. ASTM C615 covers granite dimension stone; ASTM C97 reports absorption and bulk specific gravity; ASTM C170 reports compressive strength; and ASTM C880 reports flexural strength. These tests measure different risks, so one report cannot replace the others.
3. Approve shop drawings showing each tile’s checked finished size, joint positions, openings, thresholds, levels, edge details, and installation orientation. Compare them with the final substrate survey; plaster, waterproofing, screed, adhesive, and trims can change the available dimension.
4. Require a mock-up panel using the specified adhesive, substrate colour, curing conditions, grout, and finish. Check shade, lippage, adhesive shadowing, moisture marks, and translucency before production. Then dry-lay the delivered tiles, correct major substrate humps or hollows instead of compensating with adhesive, and confirm high-low transitions before fixing.
Frequently asked questions
When should you measure the installation area for granite tiles?
Measure after screed, waterproofing, plaster, and fixed edge trims are complete, then recheck before fabrication.
What should a granite tile schedule include?
Include tile reference numbers, finished dimensions, quantities, orientation, edge details, openings, and the locations shown on the plan.
How do you calculate granite tile quantities?
Calculate the finished installation area, add a practical allowance for cuts and replacements, and confirm the required tile thickness and finished level.
What must be coordinated before granite tiles are fabricated?
Coordinate site readiness, substrate levels, delivery access, installation dates, shop drawings, stone approval, and the installer’s layout controls.
