You couldn't lift a single shingle on it
He’s suggesting that you couldn’t achieve what he’s already accomplished, much less raising his own kids better then he has, (in his opinion).
In the previous line, he said he’ll ‘raise the roof’. He’s continuing that metaphor, and saying you (other rappers) can’t lift a single shingle on it (reach my level of success). Also, shingles are usually put on roofs.
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