Exterior wall water supply lines

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oldplaceinannapolis

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I am reworking my kitchen and would like to use a wall mounted kitchen faucet on an exterior wall. Currently the copper supply lines are coming in along the sub-flooring, resting in a 'channel' formed by a gap in the finished flooring (all this under the line of cabinets). They then turn up within the sink base as usual to serve the deck mounted faucet.
The climate in coastal Maryland is relative mild but it can be cold in the winter and I am wondering about freezing if I use a wall mounted faucet.
To protect the lines when they are necessarily in the wall cavity coming up to the new faucet, do I just insulate behind them? Must that space be vented with room air for further protection?
Should I leave the lines as they are along the floor then have them dive into the wall only at the last? That seems sloppy but bringing them into the kitchen entirely within the exterior wall would increase the area vulnerable to freezing.
There is no access from below (9" unheated crawl space).
 

Terry

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Any pipes in an outside wall should have insulation on the cold side, none on the warm side.
I don't see a problem leaving the pipes under the cabinet kick space and then entering the wall above that.
 
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