I had two Solartubes installed. One near peak of a very steep roofline. The other for a very dark den. These guys are professional. Access to attic was through two wardrobe closets. I expected construction foo all over our stored closet clothing. I was wrong. Very little mess. A hand vac took care of the small amount of dust that came down from the attic. What a joy to have workmen (Chris & Eric in my house with a pleasant demeanor and quality performance. I am elated with the results!