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Acclimation CalculatorWood Acclimation Time Estimator

Estimate how long wood must acclimate to its installation environment before fitting. Calculate the target EMC, the MC gap to close, and the days of on-site conditioning needed to prevent post-installation movement.

Target EMC from ClimateMC Gap AnalysisDays to AcclimateFlooring + FurniturePDF Report
ACC

Acclimation Calculator

Wood Acclimation Time Estimator

Installation Environment
deg C

Target indoor temperature of the space.

% RH

Expected service humidity of the room.

Wood Details

Affects diffusion/acclimation speed.

%

As-delivered moisture content.

mm

Thicker boards acclimate slower.

OK
Acclimation Analysis Results
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% EMC
Target EMC
-
% MC gap
MC to Close
-
days
Acclimation Days
-
status
Readiness
FactorValueDetail
Acclimation Calculation
About Acclimation Calculator
Acclimation (or conditioning) is the process of letting wood reach moisture equilibrium with its final installation environment before it is fitted. Skipping this step is the number one cause of flooring gaps, cupping, buckling and furniture joint failure. This tool calculates the target EMC for the room, how far the wood's current MC is from that target, and how many days of on-site acclimation are needed.
Where Is This Used?
Flooring InstallationFurniture DeliverySite CarpentryInterior Fit-OutJoinery WorkshopsInstaller Checklists
Formulas Used
Target EMC from room T and RH (Hailwood-Horrobin)MC gap = | Current wood MC - Target EMC |Acclimation days ~ base x thickness_factor x gap_factor x airflow_factorThicker boards and poor airflow increase the time sharplyReady when wood MC is within ~1-2% of room EMC
Frequently Asked Questions
How long should flooring acclimate before installation?
It depends on the MC gap, not a fixed number of days. The old rule of 3 days is often wrong. If delivered flooring is at 8% MC and the room EMC is 8%, almost no acclimation is needed. If there is a 4-5% gap, solid wood can need 2-3 weeks. This tool gives a realistic estimate from your actual numbers.
Why must I acclimate to the room, not the warehouse?
Wood always moves toward the EMC of wherever it ends up. If you acclimate in a humid warehouse then install in a dry AC room, the wood will keep shrinking after installation and gap or crack. Always condition wood in the actual room, at its normal operating temperature and humidity, with the HVAC running.
Does stickering really speed up acclimation?
Dramatically. Wood exchanges moisture through its surfaces. Boards stacked flat or left boxed only expose the top, so they acclimate slowly and unevenly. Stickering (thin spacers between every layer) exposes all faces to air, cutting acclimation time substantially and giving uniform moisture - this tool factors that in.
ResourcesView the formulasFormula Library
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