Old Attic Insulation: Should You Remove It or Just Add More on Top?

By Terence | August 29, 2026

TL;DR: Sometimes you can top up old insulation and save yourself a lot of money. But if you’ve got vermiculite, rodent contamination, mould, or water damage up there, removal is non-negotiable. Here’s how to tell the difference. I was doing an attic assessment in a Scarborough bungalow last spring — one of those solid 1950s…