Why are half of my basement walls are not insulated and should I add insulation?

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Why are half of my basement walls are not insulated and should I add insulation?

Jake Morel Published: Dec. 28, 2020, 8:58 p.m.Last updated: Jan. 6, 2021, 8:05 p.m.

The top half of the walls have pink fibre glass insulation covered with clear plastic and a black plastic border nailed into the concrete but the bottom half of the walls are left uninsulated. I have a wood framed 2x4 wall an inch off the concrete. How should I insulate the bottom before putting up drywall? Thanks

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