Exterior Insulation

Step-by-step guides, tested in real houses.

A worker in gloves blowing loose-fill insulation across attic joist bays, a wooden depth ruler standing in the fill

Top Up Attic Insulation to R-49 the Right Way

A step-by-step guide to topping up attic insulation: air-seal first, install baffles, choose blown-in over batts, and verify depth with rulers every ten feet.