Donuts (Post Spacers)
Definition
When installing vinyl-over-steel fence posts — where a vinyl decorative sleeve is placed over a steel structural post — plastic spacers (trade-named ‘donuts’) are placed onto the steel post at multiple intervals before the vinyl sleeve is installed. These spacers fill the annular gap between the inner steel post and the outer vinyl sleeve, preventing the sleeve from shifting or migrating on the post. Without spacers, the vinyl sleeve moves freely on the steel post — causing wobble, squeaking in wind, and eventually base cracking. Their presence is a mark of proper vinyl installation. Their absence is a sign of a rushed installation.
Frequently Asked Questions
Why Donuts (Post Spacers) Matters
Post spacers are a trade detail invisible to homeowners but consequential for fence performance. Customers who understand this detail can ask the right question when evaluating contractors — 'Do you use post spacers on vinyl installations?' — and use the answer to gauge installer quality.
How Thrive Fencing Uses It
Thrive uses post spacers in all vinyl-over-steel post installations as standard practice.