Tomorrow there are people coming to install a fireplace and chimney, they are going to install it through a hole they will make in the roof.
My question is, is it safe? I don't want any complication come spring time. Is it common practice to install in winter? Tomorrow it will be about -19C, i don't want the workers to half ass the work because they are feeling cold, it is my house and roof we are talking about. Or i don't want the adhesive they would use to be half as effective as in summer, this resulting in damage later,Water leaking and stuff like that.
Any knowledgeable people who can help me out on this I am a little worried. Should i reschedule for a spring/summer job?