Parallel
Leviticus 14:42
Rahlfs Septuagint (1935) · Berean Standard Bible
καὶ λήμψονται λίθους ἀπεξυσμένους ἑτέρους καὶ ἀντιθήσουσιν ἀντὶ τῶν λίθων καὶ χοῦν ἕτερον λήμψονται καὶ ἐξαλείψουσιν τὴν οἰκίαν
So different stones must be obtained to replace the contaminated ones, as well as additional mortar to replaster the house.