Step-by-step guideIntermediateMedium risk

Insulating Your Attic: A Practical Guide

Air-seal first, insulate second: how attic insulation actually saves money, what R-value to target, and the safety rules around recessed lights and flues.

Tom Beaudry9 min readUpdated November 2, 2026Tech review: Marcus Oyelaran

References & review

Reviewed by HomeCraft Academy editorial team

Calculators for this project

Insulation Calculator

Batt or roll packages for a target R-value.