If the vents were sealed properly, ducts usually stay clean, but replacing your furnace filter after the job is a smart, cheap precaution. If your Waterloo home was built before the mid-1980s, we recommend asbestos testing first ($300-$500), since disturbing a positive ceiling could put fibres into the air system, and that would need specialist cleanup. Removal is $4.50/sqft unpainted, $6.50/sqft latex-painted and $7.50/sqft oil-base. A 300 sqft ceiling at $4.50 is export const FAQ_ANSWERS: FAQAnswer[] = [,350. Questions? Call (519) 729-7394. Waterloo popcorn ceiling removal · Full Ontario cost guide · See our Google reviews