Insulated floating floor support

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20 Jan 2026
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Hi all,

I am levelling off a few concrete pads into 1 level area, new kitchen/diner inside/outside space, and have seen online that my new internal floating floor needs support along the door threshold.

The make up from bottom to top; SLC, DPM, 50mm PIR insulation board, slip layer, 22mm chipboard glued together, and finally some Stone Plastic Composite click lay tiles.

I have an approximately 6m threshold for some slide and turn external doors that I want to have a flush threshold. My question is how should the batten be fixed in place along this threshold? right next to it? With some insulation between it and the threshold? And air gap?

My current plan is to use packers to get the batten to the correct height and level, then screwing it to the concrete, and pour the slc so it flows up to it underneath (to kind of use as a depth guide too). Should I fix it to the aluminium threshold too? Or would this be a bad idea due to the differing thermal expansion between materials? Maybe a high flex silicone?

Feels like I didn't type threshold enough, so here's another, threshold.

Many thanks
 

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