Attic Ventilation Myths: What Portland Homeowners Get Wrong
The default answer to attic moisture problems is always ‘add more ventilation.’ Building science says that’s usually wrong. Here’s a plain-language breakdown of the 10 most persistent myths about attic ventilation — written for Portland, Oregon and Southwest Washington homeowners.
Night Sky Radiational Cooling: Why Portland’s Clear Winter Nights Are Rotting Your Roof From the Inside
On a clear 43°F October night in Portland, frost is forming on rooftops — and moisture is condensing inside perfectly-vented attics. The cause is night sky radiational cooling, one of the most important and least understood factors affecting roof health in the Pacific Northwest.
The Hidden Air Leaks That Are Destroying Your Attic (And How to Find Them)
Before spending money on attic ventilation, answer this first: where is the moisture actually coming from? In most Portland area homes, the answer is conditioned air leaking upward through dozens of hidden gaps and bypasses. Here’s a complete guide to where they are and what they do.