Expansion Gap Calculator
Analyzing regional climate data...
Recommended Acclimation
—
Indoor %RH midpoint for this climate
🌍 Outdoor RH
—
Annual Min to Max Deviation
💡 Pro Tip: Hardwood floors are typically laid lengthwise down the long axis of the room. This determines the expansion space across the room's width.
🏠 Indoor Expansion Scenarios
* Assumes flooring was installed once acclimated to the midpoint of the goal %RH range.OPTIMAL
Heat, A/C & Humidity Control
Heat, A/C & Humidity Control
—
Total Expansion: —
MODERATE
Occasional humidifier/dehumidifier use + typical temp management
Occasional humidifier/dehumidifier use + typical temp management
—
Total Expansion: —
HEAT & A/C ONLY
No Humidity Control
No Humidity Control
—
Total Expansion: —
HEAT ONLY
No Summer A/C
No Summer A/C
—
Total Expansion: —
💡 Gaps shown in large text are "Per Side" (50% of Total Expansion).
🎞️ Gap Visualization
Visualizing the required "breathing room" filled with grey foam gasket between the stud wall and the floor edge.
SUBFLOOR
FLOORING ➔
STUD
DRYWALL
(1/2")
(1/2")
BASEBOARD
(3/4")
(3/4")
QTR ROUND
(1/2")
(1/2")
FOAM GASKET
0.00" Gap
Simulation Notice: This tool is a mathematical simulation based on regional climate
averages and wood species coefficients. It is intended for estimation and planning purposes only and does
not account for specific construction details. This model assumes a temperature of 72°F and stabilized
moisture content. Consult with professionals for final recommendations.
Disclaimer: Final expansion space determinations will be made on site and by the customer and should factor in both expansion and contraction given different scenarios.