Masonry chimneys should extend above the roof(Categories: Roofing, Chimney & Fireplace) •   2 feet higher than the roof where it penetrates the roof. •   1 foot higher than anything within 10 feet. •   3 feet higher than any point in the roof. •   3 feet higher than anything within 5 feet. •  3 feet higher than the roof where it penetrates the roof.