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Hi, I’m renovating my new home and pulled up the flooring to reveal a gap between the concrete floor and front door sweep. It goes through to outside, as I can feel a draught and seen bugs crawl through, so I’d like to patch it before laying new floor. I thought to fill it with Ardit rapid repair mortar, but I understand that a (costly) damp proof membrane is required before applying the mortar on direct to earth sub floor. Could you please let me know my options? Thanks for your time.
Welcome to the Bunnings Workshop community @Deerose. It's brilliant to have you join us, and many thanks for your question about filling a gap.
The Ardit rapid repair mortar will be fine. It's a cement-based product similar to the concrete you're repairing. In this circumstance, a membrane is not required. You could also use Earl's 1kg Concremate Expanding Cement.
Remember to pick up a scraper to apply the product and smooth the surface of it afterwards.
Please let me know if you have any questions.
Mitchell
