Roofing Journal

Pacific Northwest Roofing Intelligence.

Technical writing on Portland's specific roofing challenges โ€” moss biology, ecoroof requirements, seismic risk, and material performance in Oregon's climate. Biology-first, no filler.

Featured Article
Mossy cedar shake roof Portland Oregon
Pacific NW Roofing

Why Portland Roofs Grow Moss: The Biology of Biofilm Growth and What Actually Stops It

Portland averages 144 rainy days annually. Biofilm on north-facing surfaces is nearly inevitable without active management. Understanding what actually works โ€” not what's marketed โ€” requires understanding the biology behind what's growing on your roof.

May 8, 2025 ยท 11 min read

Read Article โ†’
Portland ecoroof green roof system
Green Roofing

Portland's Ecoroof Program: Requirements, Waterproofing, and What the City Actually Delivers

The BES incentive program offers real financial upside โ€” but the waterproofing and structural loading specs are more demanding than most contractors realize.

April 19, 2025 ยท 13 min read

Read Article โ†’
Cascadia seismic tile roofing Oregon risk
Structural Risk

Cascadia Subduction Zone and Heavy Roof Risk in Oregon

Why tile and slate are seismic risks on Oregon pre-1995 wood-frame buildings โ€” and what a licensed PE review actually involves and costs.

March 31, 2025 ยท 10 min read

Read Article โ†’
๐Ÿ“
Coming June 2026

Portland's Wind-Driven Rain Problem: Why Eave and Valley Flashing Standards for Oregon Exceed National Code

Oregon's prevailing southwest winds create a wind-driven rain exposure condition that standard flashing specifications don't address. Coming next.

In Production
Topics
Moss Biology Ecoroof Seismic Risk Cedar Shake Oregon Climate Commercial Flat Roof Metal Roofing
Stay Current

New articles monthly.
No marketing. No spam.

Portland-specific roofing science, delivered when we publish. Typically one article per month.

Unsubscribe anytime.

Why This Journal Exists

We Write What
We Actually Do.

Every protocol described in the Orchard Journal is deployed in our service programs. We don't publish generic Pacific Northwest roofing advice โ€” we publish the engineering rationale behind the specific decisions our teams make on every project.

If you read a Orchard Journal article and then schedule an inspection, the inspector who visits your property will use the exact protocols described in that article. The writing is documentation of practice โ€” not a content marketing program.

Schedule Inspection โ†’
๐Ÿ”ฌ

Biology-First Approach

We start with the biology or physics of the problem before discussing solutions. Moss grows because of specific conditions โ€” fix the conditions, not just the symptom.

๐Ÿ“

Portland-Specific Only

We don't adapt national roofing advice to Portland. Every article is written for the specific climate, vegetation, seismic context, and building stock of the Pacific Northwest.

๐Ÿ“‹

Cited and Verifiable

Claims reference DOGAMI publications, Oregon State extension research, BES documentation, and ASTM/ARMA standards โ€” not contractor opinion or anecdote.