ChippyMal
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Hi Martin, The firm I'm with still uses t&g floorboards and solid (breeze block) internal walls (traditional builders) we fix them using 50 mm lost-heads dovetail nailed for preference. I think if I was going to sand it etc; I would try and hire a power-cleat type nailer that does secret nailing through the tongue. you would also need to hire a floorboard cramp to pull them together. Worth making a nice job of it!!!
Mal
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