The Commercial Flooring Coordination SOP

Purpose

On a commercial job the flooring sub is the last trade in and the first one blamed. The schedule is already compressed, and many subcontracts treat installation as acceptance of the substrate. This SOP guarantees that before a single box is opened, the shop has approved submittals, a written moisture report the general contractor (GC) has received, confirmed building conditions, a clear work area, and an agreed protection plan through turnover. Without it, the shop installs on a wet slab under construction heat, the floor fails in month three, and the paper trail shows the shop accepted the conditions.

It owns the coordination with the GC. The installation technique, and how commercial work differs from residential on the floor itself, belongs to 'Commercial Flooring: What Changes From Residential'.

Scope

Covers: commercial and light commercial work installed under a GC or construction manager: tenant improvements, offices, clinics, retail, multifamily common areas, schools. Resilient (LVT, sheet, rubber), carpet tile and broadloom, and tile, wherever the shop is a subcontractor on someone else's schedule.

Does not cover: the moisture test procedure itself ('How to Run an In-Situ RH Test on a Slab' and 'Slab Moisture Testing for Flooring' own it), demolition of existing flooring ('The Old Floor Removal and Disposal SOP'), protection on a residential job ('The Flooring Job Site Protection SOP'), or the punch walk with an end customer ('The Flooring Final Walkthrough and Care SOP'). Direct-to-owner commercial work with no GC uses this SOP with the owner's facility manager in the GC column.

Roles and responsibilities

The handoff that breaks most often is the last one. The superintendent says "the area is yours" in passing; this SOP requires it in writing.

Procedure

1. Read the spec and build the submittal set. Pull the flooring spec sections (commonly in Division 09) and list every required submittal: product data, samples, the adhesive and primer, the maker's installation instructions, moisture limits, maintenance data, warranty, and any testing the spec assigns to the flooring contractor. Acceptance: every listed item is in the set, each product data sheet names the adhesive by its own sheet, and the PM has logged the submittal date. Wrong looks like a substitution the spec does not allow, or an adhesive whose moisture limit is lower than what the spec assumes; stop and send a request for information (RFI) before submitting, not after the slab tests high. No site hazard here, but a missed spec requirement is the most expensive single error in this procedure.

2. Hold for approved submittals. Order nothing until the submittals come back approved or approved as noted, and incorporate every note. Acceptance: a returned stamp marked approved or approved as noted, filed with the job, notes transferred to the crew's install sheet. Wrong looks like "revise and resubmit" or no response by the date the order must be placed to hold the schedule; the PM sends a written notice of the lead-time impact to the GC the same day and does not order on a verbal approval. Stock ordered on a verbal approval that later comes back rejected is the shop's loss.

3. Confirm building conditions before testing. The crew lead or tester visits and records: building closed in (roof on, exterior doors and glazing installed), permanent HVAC running, and the space at the temperature and humidity it will see in service. ASTM F2170 requires the slab and the air space to be at service conditions for at least 48 hours before RH readings, in substance; check the edition the spec names. Acceptance: thermometer-hygrometer readings at slab level inside the maker's stated range, and the superintendent confirming permanent HVAC (not portable heaters) has run continuously. Wrong looks like temporary propane or diesel heaters, open window rough-openings, or HVAC that cycles off at night; stop, do not test, and send a written notice that testing cannot begin. Combustion heaters in an enclosed space are a carbon monoxide hazard: carry a personal CO monitor on any visit where they are running, and leave the space if it alarms.

4. Test and report moisture in writing. Run the test method the spec or the flooring maker requires: ASTM F2170 in-situ RH with probes, or ASTM F1869 calcium chloride where the maker accepts it, at the frequency the standard sets (three tests for the first 1,000 square feet and one per additional 1,000). A handheld meter reading is a survey, never the acceptance test. Acceptance: every reading at or under the flooring and adhesive maker's limit, and a signed report with locations, depths, readings and the limit in the GC's hands. Wrong looks like any single reading over the limit; stop, send the report with the failing location marked, and propose the options in writing (wait and retest, or a moisture mitigation system the flooring maker accepts). Drilling probe holes in concrete releases respirable crystalline silica: use a drill with a vacuum shroud or wet method under your written exposure control plan per 29 CFR 1926.1153.

5. Confirm the substrate is ready, not just dry. Check flatness to the maker's tolerance (see 'Floor Flatness Tolerances by Floor Type'), patching, curing compounds or sealers on the slab surface, and joints. Acceptance: flatness within tolerance, no curing compound where the adhesive maker forbids it, joints identified for honoring or filling per the spec. Wrong looks like a sealed or cured surface, ridges over tolerance, or cracks the spec does not address; stop that area and send an RFI with photos. Grinding off compound or highs is silica-generating work under the same 1926.1153 plan, with a shroud and HEPA vacuum, never dry sweeping.

6. Get the area released in writing. The superintendent releases each area to flooring by room or grid line, confirming other trades are out: ceiling grid and tile done, paint complete including final coats, plumbing and electrical trims done or protected. Acceptance: a written release (email or signed form) naming the rooms and the date, and a walk with the crew lead showing no ladders, lifts or carts staged in the area. Wrong looks like another trade still working overhead or a paint crew planning a final coat after flooring; stop that area. A ladder or scissor lift rolled across fresh adhesive is a floor failure; a person on a lift overhead while your crew kneels below is a struck-by hazard, and nobody works under an elevated lift.

7. Set occupied and after-hours rules before work starts. For occupied buildings, agree in writing on work hours, egress routes kept open, adhesive and odor controls, and who notifies tenants. Acceptance: a written schedule naming the hours and the exits that stay clear, and ventilation running whenever adhesive is open. Wrong looks like an exit corridor blocked by staged material or tenants arriving to fresh adhesive in a closed suite; stop and re-stage. Solvent-bearing adhesives and primers are a flammable and inhalation hazard: follow the SDS, keep ignition sources out, and never store opened containers in a vehicle cab.

8. Install, logging conditions daily. The crew installs per the maker's instructions and logs, each day: temperature and humidity at floor level, areas installed, adhesive lot numbers, and any condition change. Acceptance: one log entry per day per area, conditions inside the maker's range every day. Wrong looks like HVAC shut off over a weekend or a new leak; stop installing in that area and notify the PM, who notifies the GC in writing.

9. Protect until turnover and hand the protection to the GC. Lay protection compatible with the material and adhesive cure (breathable protection, not plastic sheeting over fresh adhesive), post the cure time before rolling loads, and hand off in writing. Acceptance: protection continuous over every finished area, the superintendent's signature on the handoff with the date. Wrong looks like rolling loads or other trades before the adhesive's stated cure; stop and notify. After handoff, damage is the GC's to trace, which is only true if the handoff is on paper.

The record this produces

One job folder per project, kept for the life of the warranty:

• Submittal log: item, date sent, date returned, stamp, notes incorporated.
• Conditions and moisture report: date, HVAC status, temperature and humidity at slab level, test method, each location and reading against the limit, tester's signature, date sent to the GC.
• Notices: every written notice of a condition, delay or RFI, with the GC's response.
• Area releases and protection handoffs: rooms, dates, names.
• Daily logs: conditions, areas, adhesive lots.

The PM reads it during the job. The person who reads it later is whoever handles a claim in year two, and the moisture report and area release are the two documents that decide whether the shop pays for the floor.

Worked pass

A 4,000-square-foot clinic tenant improvement: glue-down LVT in exam rooms and corridors, carpet tile in offices. The adhesive's limit is 85 percent RH by F2170 (illustrative; read your adhesive's data sheet).

Step 3 did its job: no testing under propane heat, which also loads the air with combustion moisture, and the written notice moved the nine-day delay onto the GC's schedule rather than the shop's. Step 4 then failed on one probe. Five of six readings were under 85; probe 5 at 91 was over by 6 points, near the joint where the addition met the original slab. Taking the stop rule, the PM sent the report that day with two options: wait and retest that zone, or apply a mitigation system the LVT maker accepts over that bay. The GC chose the mitigation for the bay because the clinic had an opening date. The crew installed elsewhere while that zone was treated, then installed the bay after the mitigation maker's cure.

The propane heaters were a CO exposure on the first visit and the tester wore a monitor, which is why that clause sits in step 3. Installing elsewhere while one zone was on hold only worked because step 6 released areas by room; a single whole-floor release would have let the bay be laid with the rest.

References

• ASTM F2170, Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes, and ASTM F1869 (calcium chloride), in the edition the project spec names.
• 29 CFR 1926.1153, Respirable Crystalline Silica (construction).
• See related: Commercial Flooring: What Changes From Residential; How to Run an In-Situ RH Test on a Slab; Slab Moisture Testing for Flooring.
• See related: Floor Flatness Tolerances by Floor Type; The Flooring Job Site Protection SOP.
• Flooring and adhesive manufacturers' installation instructions and moisture limits.