Airtightness Performance
We target an Equivalent Leakage Area (C value) of 0.5 cm²/m² or less, with a formal airtightness test conducted.
To enhance airtightness, we take the following measures:

• Apply 100mm-wide airtight tape around windows and ventilation ducts

• Fill gaps between the sill plate and foundation with spray polyurethane foam

• Install a pre-applied airtight membrane to improve sealing performance at key junctions