"Weatherising" Natural Recordings by Native Speakers
weatherizing (note: similar to "weatherising")
noun
The process of making a building or structure more airtight or resistant to air leakage, especially in order to conserve energy or improve its thermal insulation.
It can also refer to the act of sealing gaps or cracks in doors, windows, and joints to prevent air leakage and heat loss.
Example: "The homeowner undertook various weatherizing measures to make her old house more energy-efficient."
You can also use the spelling "weatherising" in British English, but "weatherizing" is more commonly used in American English.