Stack of Bricks on a Rooftop
Puzzle 6 of Soft Things Piece of Cake Pack
Question is: Stack of Bricks on a Rooftop
and the answer is: CHIMNEY
Word Meaning:
CHIMNEY — A vertical tube or hollow column used to emit environmentally polluting gaseous and solid matter (including but not limited to by-products of burning carbon- or hydrocarbon-based fuels); a flue.
Definitions from Wiktionary.