Finish Consistency and Your Architectural Materials Supplier

A finish that looks perfect in the approved sample can look subtly wrong across a whole building if the material arrives in two different production runs, or if a stone slab for the second bathroom comes from a different block. Consistency is one of the least visible parts of specifying finishes, and one of the places a good architectural materials supplier earns its keep.

This post is for architects, designers and builders in Bellingham, WA who want the floor in the lobby to match the floor in the hallway, and the countertop in unit one to match unit six.

Shade, caliber and lot numbers in tile

Tile is manufactured in production runs, and each run can differ slightly in color and sometimes in size. Manufacturers mark boxes with lot or batch codes to track this.

• Shade refers to color variation between runs. Two lots of the same named color can sit side by side and look slightly different, especially in large open areas.
• Caliber or size variation affects grout joints. Mixing calibers can make joints uneven.
• Shade variation ratings on product data sheets describe how much piece-to-piece variation is intended within a single lot. A tile designed with high variation will look deliberately varied; a low-variation tile will show any lot difference more clearly.

The practical rule: order everything for a continuous area from a single lot, and record the lot number.

Natural stone slabs vary by block

Granite, marble and quartzite are cut from quarried blocks, and every slab is different. Slabs cut from the same block, often called sequential or bookmatched slabs, look related. Slabs from different blocks, even under the same trade name, can look quite different.

For projects with several countertops in the same stone, specify that the slabs should come from the same block where possible, and approve actual slabs or full-slab images rather than a small sample. If the project is phased, discuss with your supplier whether it is realistic to hold matching material or whether a later phase should expect some variation.

Quartz and engineered surfaces

Engineered quartz is far more consistent than natural stone, which is one reason designers specify it across multiple units. It is not perfectly uniform, though. Veined designs vary in how the veining falls across each slab, and production batches can differ slightly. For a large or multi-unit job, ask whether slabs can come from the same batch and review how veining will be laid out at seams.

Porcelain slabs, such as Bedrosians Magnifica, raise similar questions: consistent color, but pattern placement still matters.

Flooring deserves the same attention. Vinyl plank, laminate and engineered hardwood are also produced in runs, and a second order of the same color can differ slightly in tone or in the mix of board patterns. On a large open floor plan that flows from an entry through a great room and down a hall, that difference shows. Order the whole floor at once, and have the installer draw from several boxes at a time so any variation is spread evenly rather than concentrated in one room.

Order enough, once

Most consistency problems trace back to under-ordering. A project runs short, and the top-up order comes from a new lot. To avoid it:

• Calculate quantities from final measurements, not early estimates.
• Include overage suited to the layout. Diagonal, herringbone and patterned installs waste more.
• Add attic stock for future repairs. On commercial and multi-unit work, owners often want a set quantity held back.
• Order all material for a continuous area together.

Phased projects and reorders

When a project is built in phases, or an owner plans to finish a basement later, consistency needs a plan.

1. Record manufacturer, series, color, size, finish and lot for every finish, on the finish schedule and in closeout documents.
2. Decide whether to purchase later-phase material up front and store it, or accept possible variation.
3. If buying later, request samples from the current lot and compare them to installed material before ordering.
4. Consider natural breaks, such as doorways or transitions, as places where a lot change is least noticeable.

What to ask your architectural materials supplier

When you send a finish schedule for a multi-room or multi-unit project, ask:

• Can all material for each finish come from a single lot or batch?
• What is the shade variation rating for each tile, and how does it read at scale?
• For stone, can slabs be selected from the same block?
• If this color is discontinued mid-project, what are the closest alternatives?
• How should lot and batch information be recorded on delivery paperwork?

Manufacturers such as Daltile, Florida Tile and Caesarstone publish product data that helps answer some of these, and we can help with the rest for items we carry.

If you are specifying finishes for a project in Bellingham, send your finish schedule to [email protected] or call (360) 255-8377. Browse the full range of manufacturers from the Forma Material home page.