Composite Decking Expansion & Contraction: Miters, Butt Joints & Breaker Boards Explained - The Deckheads Podcast

Are your mitered deck joints opening up after installation? You're not alone — it's one of the #1 callback reasons for deck builders. In this episode of The Deckheads Podcast we break down everything you need to know about managing joints in composite and PVC decking.

🔧 WHAT WE COVER:

Why composite and PVC decking expands and contracts more than you'd expect

Mitered joints vs. butt joints — which to use and when

The "day 1 vs. day 100" rule for choosing your jointing method

When miters are acceptable (hint: keep it under 12 feet)

How to use breaker boards to define "rooms" and hide expansion

Fascia corners — why you should avoid mitering fascia, and what to do instead

Gap Cap: a new product that solves fascia corner and picture-frame joints

Why you must follow manufacturer gapping instructions to keep your warranty

How to protect yourself when a homeowner insists on a risky installation

🇨🇦 GAP CAP IN CANADA: We're the official Canadian distributor for Gap Cap. Canadian stock is landing soon — we'll be able to ship anywhere in the country. Builders and dealers: reach out about wholesale pricing.