Living in a northern climate can create some shadowing on certain north facing roof lines depending on they're pitch. The other reason is for build up of ice and snow in some prone areas, in some areas North of Toronto 24" or more of snow or more can build up on roof tops. Our latitude in the Toronto area is about 44 degrees, to maximize the amount of light input into the dome assembly Solatube developed turret extensions. These fabricated collars raise the height of the dome and are available in 4", 6", 12", 24" and 48" increments. I had a couple of installations with photos where I used these extension turrets that performed very well extending above the shadow line created by the obstructions.
48" extension turret with dome above level of A/C unit. Due South is to the right of the A/C unit
24" extension turret with dome installed above upper level roof line. In this home the shadowing what quite extensive with the split level roof casting a long shadow.
