How to professionally mount an air duct through a core hole in limestone brickwork

Trending 4 years ago

We request to adhd ventilation holes to an existing building. The holes will beryllium core-hole drilled done a limestone ceramic wall. The bricks person crevices. The contractor is acting stupid and obstructive aliases I would inquire them. How would 1 equine a short (24 cm lond, D= 300mm) portion of information aerial duct into nan halfway hole? Simply put in? Sikaflex each around? How astir consequence of moisture creeping in?

My first thought is to fto nan duct sick retired 1 cm connected some sides, and to grout nan wedge pinch sikaflex. Criticisms? Better ideas?