The process of installing furring strips (thin wooden or metal strips) to level surfaces or create space between walls and finished surfaces in construction.
From 'furring' (possibly from Old French fourrer, meaning to line or stuff) with variant spelling 'firring.' Construction terminology that became standardized in building trades.
Firring is invisible but crucial—carpenters install these thin strips behind drywall to fix uneven walls or create air gaps, and without proper firring, walls will look wavy.
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