Should I stain both sides of a fence?

Yes, ideally both sides should be stained for maximum protection. Water can penetrate from either side, causing rot. If you can only access one side, prioritise the weather-facing side (usually west or south). Staining both sides doubles the paint needed but significantly extends the fence's lifespan — from 5-10 years to 15-20 years with regular maintenance.

Why do fence posts absorb more stain?

Fence posts, especially the end-grain (cut top), absorb roughly 2× more stain than smooth panel faces. End grain exposes the wood's open cell structure, acting like tiny straws that soak up preservative. This is actually beneficial — posts are the most vulnerable part of a fence (ground contact, exposed tops), so extra stain penetration protects them where it matters most.

How many coats of fence stain should I apply?

Two coats are recommended for best protection. Apply the first coat liberally, let it soak in for 24 hours, then apply the second coat. For new or untreated timber, the first coat will absorb heavily. Some products like creosote substitute are designed as single-coat applications. Always check the product's data sheet for recommended coats.

What is the best time to stain a fence?

Late spring to early autumn is ideal — when temperatures are above 10°C with no rain forecast for 24 hours. Avoid staining in direct hot sun (causes too-rapid drying) or when frost is expected. Early morning is best as you have all day for drying. Never stain wet wood — the moisture prevents stain penetration and causes peeling.

How often should I re-stain a fence?

Standard fence stain needs reapplication every 2-3 years. Premium products like Cuprinol Ducksback claim 5 years between coats. Creosote substitutes last 3-5 years. The south and west sides of a fence weather faster and may need more frequent treatment. If water no longer beads on the surface, it's time to re-stain.

TradeCalculator

Fence Staining Calculator — Panels, Posts & Both Sides

Calculate fence stain or preserver quantities. Covers both sides, post faces, and end-grain soaking for accurate estimates.

Fence Length

Total linear metres of fence

Fence Height

Standard fence: 1.8m (6ft)

Number of Posts

Typically every 1.8-2.4m

Post Height (above ground)

Stain Type

Determines coverage rate

Number of Coats

2 coats recommended

Price Per Tin (optional)

Tin Size

Standard 5L tins

Stain both sides of fence

Recommended for maximum protection

How We Calculate This

This calculator works out fence stain quantities by calculating panel area (both sides if applicable), post surface area (all 4 faces), and end-grain absorption.

The formula

Panel area = Length × Height × Sides (1 or 2)

Post area = Posts × Height × 0.075m × 4 faces

End-grain = Posts × 0.075² m² × 2.0 soak factor

Stain (L) = (Total area × Coats ÷ Coverage) × Wastage

For example, 15m fence at 1.8m high, both sides, 9 posts: Panels = 15 × 1.8 × 2 = 54 m². Posts = 9 × 1.8 × 0.075 × 4 = 4.9 m². Total = ~59 m². At 6 m²/L × 2 coats = 19.7 L + 10% = ~22 L (5 × 5L tins).

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.