Hi, I have removed the sliding door between dining room and conservatory, but with the 20mm insulation and underfloor heating mats, there will be approx 30-35mm height difference between the two floors. I want to lay the same laminate through both rooms with as seamless a threshold as possible, and increasing the height in the dining room isn't an option as it'll mean the same problem at kitchen and living room thresholds. Any ideas? I can only find threshold bars with up to 20mm rebate online. Pleas help!