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Identify hollow tiles by tapping lightly with a rubber mallet or small wooden dowel.
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Use blue painters’ tape to mark the area and take a picture for future proof of where you have injected and repaired the floor.
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Drill into the grout joint with 4 to 8 injector holes around the loose tiles.
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Drill slightly below the tile being careful not to drill into the edges of the tile.
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Do not drill into the sub-floor.
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Vacuum or shop vac each hole, tapping gently to loosen debris.
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Cut tip to desired size if using the 10 oz tube. (Otherwise fill your refillable caulk gun with adhesive from the gallon size).
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Using a standard or refillable caulking gun, insert cut tip into injector hole.
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Apply light pressure while keeping tip off of the sub-floor and squeeze slowly.
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If a hole is blocked, move on to the next hole and inject until you see the adhesive come up through the other holes.
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If no adhesive comes up, check with rubber mallet to make sure the sound is solid.
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Clean up with warm water using a damp sponge or rag.
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Place weighted objects such as buckets of water on the injected area and allow 12 to 24 hours drying time.
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Re-fill injected holes with matching caulk or grout.
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By injecting your tile floor you have saved a lot of money!