The #1 Sizing Rule: Don't Size It "Exact"
A common mistake is matching the guide size to the piling diameter. In real-world conditions, that can lead to sticking and uneven wear.
A better rule of thumb is to go one size up so the dock moves freely but stays guided.
Typical Sizing Examples (Rule-of-Thumb)
- ~8" piling → choose a ~10" pile guide
- ~10" piling → choose a ~12" pile guide
- ~12" piling → choose a ~14" pile guide
- ~14" piling → choose a ~16" pile guide
Why the Extra Clearance Helps
Piles rarely stay perfectly “factory-sized” forever. Clearance matters because:
- Wood pilings can swell
- Marine growth can build up
- Docks and pilings can shift slightly under load and waves
All of that can turn a “perfect fit” into a jam!
How to Measure Your Piling (The Easy Way)
- Measure the outside diameter of the piling
- Measure in a couple spots (piles can vary)
- Use the largest measurement
- Round up and apply the one-size-up rule
Example: If your piling measures about 9.75", treat it like a 10" piling and size up accordingly.
Roller vs. Non-Roller: Which Pile Guide Should You Choose?
Pile Guides with Rollers
Rollers reduce friction during vertical travel, which can help in areas with:
- Bigger water level swings
- Higher wake / wave action
- Frequent movement
Dock Builders Supply offers pile hoop assemblies with integrated rollers, designed to guide smoothly along pilings while water levels change.
The 12" Pile Hoop Assembly with Roller is designed for 9"-10" diameter pilings and includes the deck plate, roller, and removable hoop.
Non-Roller (Rub Plate / Fixed Contact) Styles
These are often a solid, simple choice where movement is moderate and you want fewer moving parts (and less maintenance).