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it is the roof that is what on the top a roof
I have a roof on top of my house
it is on top of a house
Put an electric......something on top of it.
A house has a roof on top it.
Roof.
ground or base
Lots of possibilities, but a simple one is to imagine a child's drawing of a house. This will usually consist of a square (or rectangular) "house" part with a triangular roof on top. If the roof is steep enough, it will have an acute angle at the top. The two base angles (sides of the house) will be 90 deg and the two angles where the walls meet the roof will be obtuse.
The top of the house had a ridge on it.Our house has a ridge on the top of the roof.
It means the shelter (the roof/top) of the house
I might be wrong to whoever reads this, but I think a house-top carpenter is a person who replaces or makes the roof of a house. The carpenter might build the trusses that hold up the roof. A roofer is the person who puts the roof covering (tar paper, shingles, etc.) on top of the trusses.
Above the top floor of your house and under the roof.