Outdoor shower posts come in two dominant materials: pressure-treated cedar and stainless steel. Both can last decades. Both have real weaknesses. This comparison covers longevity, cost, installation, aesthetics, and which conditions favour one over the other.
Cedar: Natural and Affordable
Cedar is the default choice — widely available, easy to work with, and naturally resistant to rot and insects. A 4x4 cedar post runs $15–30 depending on length, a fraction of stainless steel. Service life above grade is 15–25 years with proper maintenance. The limitation is moisture: a shower post is wet every day, and constant wetting at the base combined with concrete contact accelerates decay even in naturally durable wood. Annual oiling with a penetrating exterior finish slows this significantly. For post installation, see our guide to setting a pressure-treated shower post.
Stainless Steel: Industrial and Permanent
A stainless steel post — 2-inch or 3-inch square or round tube in 304 or 316 grade — will not rot, crack, or warp. In coastal environments where cedar shows corrosion-related issues within a decade, stainless is the clearly superior structural choice. 316 grade is specified for marine environments; 304 is adequate inland. Cost: $120–300 per post depending on diameter and grade. Installation requires a base plate and concrete footing anchor or surface-mount hardware — more precision than setting a wood post.
Longevity
Cedar: 15–25 years in ideal conditions. Stainless steel: 40-plus years, effectively indefinite in most inland environments. The gap widens in high-humidity, coastal, or high-UV environments where cedar maintenance becomes demanding and hardware corrodes quickly.
Cost Over Time
Cedar wins on material cost: $15–30 versus $120–300. Over 30 years, factor in annual maintenance and eventual cedar replacement — the lifecycle cost gap narrows considerably. A cedar post replaced once and a stainless post never replaced often come within $100–200 of each other at 30 years.
Aesthetics and Hardware
Cedar reads as natural and warm — it fits garden settings, matches wood walls, and weathers to silver-grey without treatment. Stainless is clean and modern; it suits contemporary architecture and polished tile walls. Hardware is easier to attach to wood — any screw or lag bolt works directly. Stainless tube requires drilled and tapped holes or clamp-style mounting hardware; most quality outdoor fixture manufacturers offer clamp kits for round and square steel tube. For fixture specifics, see our outdoor shower fixtures and hardware guide.
Verdict
Cedar is the right choice for inland builds, garden-aesthetic projects, and DIY builders who want a lower-cost, easier-to-work-with material. Stainless steel is worth the investment for coastal environments, contemporary designs, or permanent installations where a 40-plus year service life justifies the upfront cost.
Frequently Asked Questions
- How long does a cedar shower post last outdoors?
- A cedar post oiled annually and set in a well-drained concrete footing typically lasts 15–25 years. Constant moisture and neglected maintenance shorten this to 8–12 years.
- What grade of stainless steel is best for an outdoor shower post?
- 316 grade for coastal or marine environments — it resists chloride corrosion. 304 grade is adequate inland and costs slightly less.
- Can I attach standard shower fixtures to a stainless steel post?
- Yes, with drilled and tapped holes or clamp-style mounting hardware. Most quality outdoor shower hardware manufacturers offer both attachment methods.
- Is the extra cost of stainless steel worth it?
- In coastal environments or for permanent high-end installations, yes. For inland builds with proper cedar maintenance, cedar delivers good value at a fraction of the cost.