Delta-MS 5 ft x 65.6 ft (328 SqFt/Roll) Brown Foundation Waterproofing Mat

https://www.amazon.com/Cosella-Dorken-Delta-MS-Foundation-Waterproofing/dp/B076H8R821 This type of stuff is what i was thinking, but again I'm NOT an expert, I have no idea if thats a good application for it (and it likely isn't, its for like below grade foundation basements and crawl spaces) but what i mean to say is that there needs to be a drainage plane for any water behind so it doesn't freeze and bust the mortar again.