DIY SPC overlay over old tiles only succeeds with three critical pre-install checks: secure tiles with no hollow sounds, floor flatness within 3mm over 2m, and fully degreased, dust-free surfaces. Add a thin moisture barrier, reserve 8–10mm expansion gaps, stagger plank seams and use transition strips for doorways. Avoid forced hammering and unaddressed damp substrates to prevent creaking, warping and broken lock joints for long-lasting floor performance.
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