With today’s construction schedules, we see this issue time and time again: the job site isn’t acclimated when it’s time to install the flooring. For various reasons, critical conditions aren’t always met. Sometimes, the HVAC system hasn’t been turned on. Other times, the space isn’t finished, or essential components aren’t even on-site yet. There may also be cases where utility hookups aren’t completed, or worse, not all doors and windows are in place. Does this really pose a problem for flooring installation? In short, yes.

Every flooring manufacturer, regardless of flooring type, clearly states in their installation instructions that spaces must be acclimated as a prerequisite for installation. Many go so far as to require that the permanent HVAC system be operational. What’s behind this requirement? There are several reasons.

First, concrete slab moisture tests for flooring installations can only be conducted in spaces acclimated to service conditions. While we won’t delve into concrete moisture testing here, the simple fact is that to obtain moisture test results recognized by flooring or adhesive manufacturers (in case of a failure), the tests must be done according to ASTM standards. These standards specify that spaces must be acclimated, and this acclimation must be achieved at least 48 hours before testing begins.

Second, many types of flooring can shrink or expand with environmental changes. Anything with a vinyl component is especially susceptible. This is why materials like LVT, LVP, VCT, sheet vinyl, carpet tile, and other flooring types must be acclimated for about 48 hours before installation. For instance, if LVP is installed in a cool space, and the temperature is later raised to a comfortable level, the planks may expand, causing peaks where they press together. Conversely, if LVP is installed during summer in an unacclimated space, and the area is then cooled to a comfortable level, the planks may shrink, creating gaps.

A third factor is adhesive performance. Cold temperatures can inhibit adhesive curing, which, at best, slows down installation. In the worst case, the adhesive may not cure properly at all. On the other hand, hot temperatures can speed up adhesive curing. While some flooring may adhere well, if the installer isn’t careful, some sections may be installed over adhesive that has already set, preventing a strong bond.

Finally, there’s the issue of dew point. We encountered this earlier this year on a project. While the job site wasn’t acclimated with permanent HVAC, we felt comfortable proceeding since it was early summer, and we anticipated generally acceptable temperatures. However, we had an unexpectedly hot weekend followed by much cooler nights. The result? Condensation formed on the slabs, leading to installation issues.

So yes, site acclimation prior to flooring installation is critical and should be carefully considered in construction scheduling.

For more information, contact us today!