Why Mold Grew Inside Door Frames, Thresholds, and Structural Transitions
The places meant for movement often held the most friction.
I never questioned door frames.
They felt solid, functional, and finished — parts of the house designed to separate rooms cleanly and reliably.
By this point, I already understood where mold hid in my home, how it followed framing gaps and boundary transitions, and how it could linger behind finished details that looked complete. Doorways showed me how often environments collide in one narrow space.
The door worked — the environment around it didn’t settle.
Where spaces meet, conditions rarely stay still.
Why Door Frames and Thresholds Behave Differently
Doorways experience constant change.
They open and close, separating heated and unheated areas, conditioned and unconditioned spaces, indoor and outdoor air.
That movement creates pressure shifts that quietly pull moisture into surrounding materials.
Repeated transition creates ongoing adjustment, not balance.
I didn’t realize how much the doorway was always negotiating.
The Transition Points I Never Thought to Look At
The pattern appeared where materials met.
Exterior door frames. Bathroom thresholds. Doors leading to garages, basements, or rarely used rooms.
Many of these overlapped with what I had already seen in larger transition spaces and near foundation-level edges.
Mold followed friction points, not traffic.
How Doorway Conditions Changed the Way Rooms Felt
I didn’t notice the frame itself.
I noticed certain rooms feeling different once the door was opened — air that felt heavier, cooler, or harder to settle into.
That mirrored what I had already experienced when I realized conditions could move with air pathways, not just stay where they formed.
My body reacted to what crossed the threshold.
The shift happened the moment the door moved.
What Shifted When I Stopped Trusting Transitions
I stopped assuming that functional meant neutral.
I started noticing where rooms connected, how often doors stayed closed, and which transitions always felt off.
This understanding built naturally on what I had already learned about areas that rarely fully reset.
Awareness came from noticing where environments crossed paths.