Ontario Commercial Sealants is an Ottawa firm whose team of caulking and firestopping specialists works on precast concrete, windows, panels and door openings, including at height using swing stages, lifts and climbers. Its published scope runs from structural glazing to mechanical penetration firestopping. The firm is registered with the Commission de la construction du Quebec, allowing it to deliver firestopping and caulking projects in both Ontario and Quebec, and appears on the FCIA Canadian member register.