Curing Compound Spec Checklist for Specifiers

Most curing sections are short, and most curing disputes come from what they leave out: no rate, no film check, no word on flooring. This checklist pulls the requirements from published guide specs, federal and municipal, so you can write the section or review a submittal against it. Each item names the spec it comes from.

Where does curing compound go in MasterFormat?

Curing sits under 03 39 00 Concrete Curing. The Mile High Flood District’s Section 03 39 00 is a typical standalone section covering compound, moist curing and sheet curing. Manufacturer guide specs, such as W.R. Meadows’ guide spec for 1100, use 03 39 23 Membrane Concrete Curing.

Federal work is different. UFGS 03 30 00 Cast-in-Place Concrete (February 2019, Change 10 of August 2025) superseded UFGS 03 39 00.00 10, so curing now lives in the 03 30 00 curing article. Older office masters may still use 03390, the five-digit number on Lambert’s 1999 guide spec.

What should the curing compound spec require?

Require a named standard with type and class, a VOC limit, a rate, timing, weather limits, a curing period, and rules for surfaces that get a finish. The table lists each item and a published spec that already says it, so you can copy the intent and edit the numbers.

The UFGS adds two duration rules worth copying: 10 days for retaining walls, pavement and chimneys, and Type III cement at one fourth of the portland cement period but never less than 72 hours.

How do you set the VOC line?

Write the limit for the place the job is, not a national number. The W.R. Meadows guide spec cites 350 g/L under the US EPA architectural coatings rule. In the South Coast district, Rule 1113 caps curing compounds at 100 g/L, with 350 g/L allowed only on roadways and bridges, not curbs, sidewalks or driveways.

Ask for the number in writing. UFGS 03 30 00 requires a certification showing the VOC content of each curing compound. For limits by state and district, see the curing compound VOC limits table.

Which ACI documents should the spec cite?

Cite one curing spec to govern and stick to it. The ACI SPEC-308.1-23 preview says not to use it with ACI 301 or ACI 350.5 unless the contract documents state that 308.1 governs the curing work. It also has its own submittals article (1.5).

That matters because UFGS 03 30 00 points curing materials to both ACI 301 Section 5 and ACI SPEC 308.1 Section 2. If your office master does the same, add a line naming the document that governs. The ACI 308 summary covers what changed in the 2023 spec and the 2026 guide.

What should a curing compound submittal include?

Ask for five things: product data, application instructions, VOC certification, the SDS, and the finish maker’s acceptance where a finish follows. Most published sections stop at the first two. Deer Park’s Item 526 asks for the vendor’s data and the manufacturer’s recommended method of application.

• Product data: standard, type and class printed on the sheet, and the solids and chemistry.
• Application instructions: rate per coat, number of coats, equipment, and temperature limits.
• VOC certification: content in g/L for the product as delivered.
• Safety data sheet: UFGS requires SDS for regulated materials on site each shift.
• Finish acceptance: letter from the flooring, coating or sealer maker, or a removal plan.

How do you review a curing compound submittal?

Check the data sheet against the spec line by line, and reject anything that does not print the standard and class. A product that says “meets C309” with no type or class has not told you enough. These checks catch most problems:

1. Standard and class match. C309 Class A or B and C1315 Class A, B or C mean different things, so check the letter against the right standard.
2. Type matches the use. White Type 2 on exposed paving in sun; clear or dyed where appearance matters.
3. Rate is not lighter than tested. The C309 test rate is 200 ft²/gal; C1315 Type I is tested at 300 ft²/gal.
4. VOC is under the local limit.
5. Cold limit fits the schedule. Water-based products often stop at 40°F (4°C).
6. Finish compatibility is in writing for every area that gets flooring, coating or sealer.
7. Dissipation time fits the schedule. One water-based C309 product starts breaking down after about 4 weeks and takes another 3 to 5 weeks to dissipate, per W.R. Meadows.

How do you verify the curing compound in the field?

Check the rate and check the film. Deer Park’s Item 526 makes the contractor provide a way to control and check the application rate, then has the engineer inspect treated areas with a few drops of water. Water that beads means a film is there; water that darkens or soaks in means there is none.

Where the film is missing, the same spec calls for another coat right away and a higher rate until the area is uniformly covered. Add these field items to your section:

• Spray after the free surface water is gone, then recoat any area hit by rain before the film dries.
• Two coats at right angles, which MHFD’s section requires for sprayed compound.
• Compound agitated just before and continuously during application, per Iowa DOT Section 4105.
• No product from a lot that has frozen.

What should the spec say about floors that get a finish?

Keep compound off those floors or name how it comes off. UFGS 03 30 00 bars membrane compound where coverings will be bonded and calls for moist curing under liquid hardeners, sealers and epoxy. The Lambert guide spec allows compound under floor coverings only if the floor covering maker recommends it.

W.R. Meadows’ notes say to get the flooring maker’s approval over a resin compound and run a small test application. For bond testing, removal and moisture testing, see curing compound and flooring.

If the approved product does not match the slab’s finish

Fix the paperwork before the slab is poured if you can. Mark the curing plan by area: compound on exterior flatwork, moist or sheet curing on floors getting adhesive, coatings or hardeners. Then ask for a revised submittal for the floor areas only.

If the slab is already sprayed, get the flooring maker’s position in writing, run a bond test with the job adhesive, and plan for removal if it fails. Record the rate, date and weather of each pour so the next dispute has facts behind it.