Is Damp proofing interior of garage foundation walls required? – GreenBuildingAdvisor

I’m building an addition for a client and the concrete contractor let me know damp proofing the interior of the garage foundation walls is required by code. I looked at the code and it doesn’t specify whether to dampproof the outside or inside. I’ve seen this done on the inside of another garage in a different town in the same state (MA) and it didn’t make sense to me. Could someone please explain why the garage foundation should not get dampproofed on the outside just like the rest of the house foundation?

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Start free trial