# Pressure-Treated vs. Composite Decking: Which Is Right for Calgary?

Published: 2026-06-20
Tags: decks, materials, calgary

Pressure-treated vs composite decking compared for Calgary homes: cost, maintenance, lifespan, and how chinooks affect each material.

It's the first big decision on every deck project: pressure-treated wood or composite? There's no universal answer — but there is a right answer *for your yard, your budget, and how many weekends you want to spend holding a stain brush*. Here's an honest comparison from a builder who works with both.

## Upfront Cost

**Pressure-treated (PT) lumber** is the value champion. For the same-sized deck, PT typically runs 30–50% less than composite once installed.

**Composite decking** (Trex, TimberTech, and similar) costs more up front — the boards themselves run several times the price of PT — but railings, fasteners, and framing costs stay comparable.

## Maintenance Reality

This is where the decision usually gets made:

- **PT decks need staining or sealing** roughly every 2–4 years in Calgary's climate. Skip it and boards grey, crack, and cup. That's real recurring cost: either your weekends or $800–$1,500 per treatment.
- **Composite needs soap and water.** No staining, no sealing, ever. Dirt washes off; colour is manufactured all the way through the board.

Over a 15-year horizon, the total cost of ownership often converges — you pay either in upfront materials or in ongoing maintenance.

## How Calgary Weather Treats Each Material

Our chinook cycles deserve special mention. Going from deep freeze to plus-double-digits and back stresses materials through constant expansion and contraction.

- **PT wood** handles the cycles well when properly sealed — the sealer is doing the moisture management, so keeping up with it matters.
- **Composite** is dimensionally stable and doesn't rot, but dark-coloured composites get genuinely hot in direct summer sun and can show thermal expansion gaps if installed without proper spacing (a builder issue, not a material issue).

## Lifespan

- Well-maintained PT deck: **15–25 years**
- Quality composite deck: **25–30+ years**, often backed by lengthy manufacturer warranties

## The Honest Decision Guide

**Choose pressure-treated if:** budget is the priority, you don't mind periodic maintenance, or you love the look of real wood and plan to restain anyway.

**Choose composite if:** you want zero maintenance, plan to stay in the home long-term, or the deck gets full sun and hard use.

## One More Option: Hybrid

Many of our favourite builds use **PT framing with composite surface boards** — you get structural lumber where it's hidden and low-maintenance composite where your bare feet go. It's often the best-value compromise.

Still torn? During a free estimate we walk both options against your actual yard and budget — [reach out](/contact/) and we'll bring samples.

[Limacher Contracting](https://www.limachercontracting.com)