Appears 4 times in the Quran.
16:26 قَدْ مَكَرَ ٱلَّذِينَ مِن قَبْلِهِمْ فَأَتَى ٱللَّهُ بُنْيَٰنَهُم مِّنَ ٱلْقَوَاعِدِ فَخَرَّ عَلَيْهِمُ ٱلسَّقْفُ مِن فَوْقِهِمْ وَأَتَىٰهُمُ ٱلْعَذَابُ مِنْ حَيْثُ لَا يَشْعُرُونَ
Those before them did indeed devise plans, but Allah demolished their building from the foundations, so the roof fell down on them from above them, and the punishment came to them from whence they did not perceive.
And We have made the heaven a guarded canopy and (yet) they turn aside from its signs.
43:33 وَلَوْلَآ أَن يَكُونَ ٱلنَّاسُ أُمَّةً وَٰحِدَةً لَّجَعَلْنَا لِمَن يَكْفُرُ بِٱلرَّحْمَٰنِ لِبُيُوتِهِمْ سُقُفًا مِّن فِضَّةٍ وَمَعَارِجَ عَلَيْهَا يَظْهَرُونَ
And were it not that all people had been a single nation, We would certainly have assigned to those who disbelieve in the Beneficent Allah (to make) of silver the roofs of their houses and the stairs by which they ascend.
And the elevated canopy