Product Guide Lightweight Concrete Roof Insulation Concrete tiles being installed to insulate a roof from the sun in Haikou City, Hainan Province, China Photo: Anna Frodesiak. License: Public domain. Behind the recommendations Related articles Behind the recommendations Related articles Lightweight Concrete Roof Insulation Foamed or aerated concrete roof insulation that protects other insulating and waterproofing layers More about Lightweight Concrete Roof Insulation Can We Replace Foam Insulation? There are a lot of reasons to avoid foam, but its high performance can make it a hard habit to kick, as designers are finding out. Low-Slope Roofing: Prospects Looking Up Polystyrene Insulation: Does It Belong in a Green Building?