Resinous floors rarely fail inside a layer, which is why the specification should cover one tested system from one manufacturer rather than a list of products.
For architects, engineers and owners who write or approve Division 09 floor specifications, the most consequential choice is often not which product to use. It is whether the floor is specified as one tested system or assembled from individual products that were never qualified together.
This article covers why floors fail between layers, what a system specification includes, how substitutions break systems and what owners gain from single-source responsibility. For the broader challenge of choosing performance criteria, see Why Specifying Floor Coating Projects Is Difficult.
A resinous floor system is the full assembly installed over the slab. It typically includes a primer, one or more body coats, broadcast aggregate, a grout coat, a topcoat, integral cove base and the patching and crack repair materials beneath them.
Each layer has a job, and each one depends on the layer below it for bond. The system is only as reliable as the weakest interface between those layers.
Floors rarely fail in the middle of a layer. Field investigations far more often trace the problem to an interface, such as a bond line between coats, a patch or a termination (an observation from field experience rather than a measured statistic).
Common interface problems include:
Each of these can pass a quick look at installation and appear months later as delamination, blistering, cracking or discoloration. The products involved may each be sound, but the combination was never tested.
A system specification describes the whole assembly and makes one manufacturer responsible for it. Most MasterFormat Section 09 67 23 Resinous Flooring guide specifications already include single-source language, and it should survive into the final document.
A sample excerpt:
"Primary resinous flooring materials, including primers, body coats, broadcast aggregates, grout coats, topcoats and cove base materials, shall be produced or supplied by a single manufacturer. Patching, crack repair and joint materials shall be as recommended in writing by that manufacturer."
Beyond that clause, a complete system specification typically includes:
Most mixed systems are not designed that way. They are created during bidding and installation, one product at a time, when a contractor proposes a faster primer, a topcoat from another line or a local patching product.
A product-level "or equal" clause makes this easy. A stronger approach accepts substitutions only as complete systems, with the same documentation required of the basis of design:
Under this approach, a request to change one layer is treated as a request to change the system. Manufacturer literature is the quickest check, since floor coating data sheets typically list the primers and topcoats each product is designed to work with.
The most direct benefit to owners is accountability. When one manufacturer supplies the system and one approved installer applies it, there is one place to go if something goes wrong, and fewer opportunities for each party to point at another.
There is also a long-term benefit. When record documents identify a specific system, the facility knows what is on the floor, what it can be recoated with and what preparation is needed. A floor built from mixed products leaves the next project team guessing.
Tnemec publishes its flooring as defined systems that list the primer, base or body coats with quartz or flake broadcast, grout coat, finish coat and optional cove base. Its flooring guide asks that systems be reviewed with a Tnemec representative before final selection.
Products used across those systems include Tnemec Series N222 Deco-Tread, a Modified Polyamine Epoxy that Tnemec lists for use as a primer, broadcast coat, grout coat and topcoat. Tnemec Series N242 Ultra-Tread S is a Polyurethane Modified Concrete topping, and Tnemec Series 256 ExcellaThane is a Modified Aliphatic Polyaspartic finish coat.
Each product page lists the primers and topcoats the product is designed to work with.
A single-source system specification, backed by system-level test data, a full-thickness mockup, a qualified installer and a single warranty, keeps the interfaces between layers under one manufacturer's responsibility. We recommend treating any substitution as a change to the whole system.
Specify the floor, not the products.
The following conditions are to be confirmed in the field with the applicable test before a system is finalized:
We are happy to help. Contact a High Performance Coating Consultant in your region to review your project conditions and specification.