Don’t Replace Your Front Door
Until You Read This
Steel, fiberglass, or wood — the material your entry door is made of quietly determines how much heat you lose, how much you spend on energy, and how soon you’ll need to do it all over again. Here’s the honest breakdown.
Your front door might be the most overlooked energy leak in your home
Most homeowners replace their entry door because it’s ugly, warped, or stuck. Very few think about what that door is doing — or failing to do — for their home’s thermal envelope every single winter. That’s a mistake that costs real money.
According to Natural Resources Canada, a poorly insulated or aged exterior door can account for up to 11% of a home’s total heat loss. In a Canadian winter where your furnace is running hard, that’s not a rounding error. It’s a meaningful drain on your heating bill, your comfort, and the long-term performance of your building envelope.
The good news is that a front door replacement is one of the faster-payback upgrades you can make. The tricky part is knowing which material is actually worth it — because steel, fiberglass, and wood each tell a very different story when you put them side by side.
“The door you choose today will either pay you back in comfort and savings, or quietly cost you for the next 20 years. The difference between materials isn’t cosmetic — it’s thermal.”
Five reasons the right door changes your home’s performance
Before we get into the materials, it’s worth understanding what a modern energy-efficient entry door actually does differently from a 15- or 20-year-old unit — regardless of what it’s made of.
Modern doors have real insulation — old ones often don’t
Older steel doors often used cheap polystyrene board as filler. Modern steel and fiberglass doors use injected high-density polyurethane foam, which delivers dramatically higher R-values per inch and maintains performance for decades without settling or compressing.
Four-sided compression seals stop drafts completely
Current generation entry doors use compression weatherstripping on all four sides of the frame. Combined with adjustable multi-point locking hardware, they create a full perimeter air seal that older single-point latches simply can’t match.
Thermally broken thresholds eliminate floor-level cold transfer
Modern doors feature thermally broken aluminum thresholds with adjustable seals that close off the gap between door and floor, stopping both drafts and moisture infiltration at the most vulnerable point.
Door glass has caught up to window technology
Modern door glass uses argon-filled double-pane units with low-e coatings, dramatically improving the overall door system’s U-factor compared to the single-pane and early double-pane inserts common in older doors.
The frame is as important as the door slab itself
Modern door frame systems include insulated jambs, foam-injected rough openings, and thermal break technology that treats the entire assembly as a single thermal unit rather than just a slab in a hole.
Steel Entry Doors — Modern strength, honest tradeoffs
Steel doors have dominated the Canadian entry door market for decades. They’re durable, affordable relative to fiberglass, and deliver a clean, contemporary look that works well across a wide range of home styles. The best modern examples — including Novatech’s steel lineup — are genuinely impressive thermal performers.
Uno steel door with Azur glass insert and full-height sidelights. A clean modern configuration that maximises natural light while keeping the confident feel and thermal performance of a steel slab.
The key variable in a steel door’s energy performance is its core. A polyurethane-injected steel slab (rather than a polystyrene board insert) can achieve R-values in the R-8 to R-12 range, putting it well ahead of most solid wood alternatives.
Vogue is bold and modern — excellent with accents and high-contrast finishes. Vogue 2 accent in matte gold for a premium contrast. The solid panel configuration maximises the door’s insulated core with no glass heat loss.
🔬 Novatech Steel Doors — Built for Canadian Winters
Novatech’s steel entry doors use high-density polyurethane foam cores, triple-point compression locking for air sealing, and thermally broken thresholds — all manufactured to Canadian energy performance standards. Explore steel doors →
Energy-efficient, durable, and design-flexible
- Polyurethane core delivers strong thermal performance
- Resists denting, warping, and seasonal movement
- Excellent security — difficult to kick in
- Wide range of glass, finishes, and sidelight layouts
- Lower cost than equivalent fiberglass
- Holds paint well for long-term colour consistency
- Thermal bridging at steel edges conducts cold inward
- Cannot be stained — paint only
- Prone to surface dents from hard impact
- May show rust at cut edges if coating is damaged
For homeowners who want a strong, modern-looking entry door with proven longevity and a wide range of glass and colour options, steel remains an excellent choice. Browse ECO Glass steel entry doors →
Fiberglass Entry Doors — The clear thermal winner
Fiberglass entry doors are the premium choice, and the performance data justifies the price. Fiberglass is a non-conducting material — it doesn’t transfer heat the way steel does, eliminating thermal bridging at the edges and through the face. When you combine that with a high-density polyurethane foam core, you get door assembly R-values that can reach R-15 in premium configurations.
Modern Chevron fiberglass door with full-height sidelights on both sides. A dramatic, design-forward entry that would require constant repainting and risk warping if built in wood — in fiberglass, it’s a low-maintenance, high-performance installation.
🌿 Novatech Fiberglass — Engineered for Canadian Climates
Novatech’s fiberglass exterior doors feature reinforced internal structures, polyurethane foam cores, and triple-point locking. Their wood-grain textures accept stain realistically — wood look, zero wood maintenance. Explore fiberglass doors →
Highest thermal performance, lowest lifetime maintenance
- No thermal bridging — fiberglass doesn’t conduct heat
- Highest R-values of any door material
- Can be stained or painted, including realistic wood grain
- Won’t rot, warp, swell, or support mould
- Exceptional dimensional stability in freeze-thaw cycles
- 20–25 year manufacturer warranties typical
- Higher upfront cost than steel
- Stain colour depth varies by texture quality
- Very large impacts can chip the surface
For homeowners who want a wood-look entry door that won’t demand the upkeep of real wood — or who are replacing a drafty old door and want the best available thermal performance — ECO Glass fiberglass doors are worth a close look.
Wood Entry Doors — Beautiful, but honest about their limits
Wood entry doors are the emotional choice — there’s genuinely nothing that looks quite like a well-crafted mahogany or oak front door on a traditional home. But it’s worth being clear-eyed about what wood offers and what it doesn’t.
A solid wood door has a measured R-value of approximately R-2 to R-3 depending on species and thickness. That’s substantially lower than both steel and fiberglass. Wood also expands and contracts significantly with seasonal moisture and temperature changes — meaning seals degrade faster, the door can stick or develop gaps, and weatherstripping needs more frequent attention.
⚠️ The Wood Door Maintenance Reality
A premium wood entry door requires repainting or restaining every 2–5 years to protect against moisture infiltration. In Canadian climates, an unmaintained wood door can begin to show splits, delamination, or rot at the base within 8–12 years. Factor the full lifetime cost into any comparison — not just the purchase price.
Timeless character, higher ongoing commitment
- Authentic, irreplaceable natural appearance
- Can be refinished and restored over time
- Strong character for heritage and traditional homes
- Tactile warmth that synthetic materials can’t fully replicate
- Lowest R-value of all three materials
- Expands and contracts — seals degrade faster
- Requires refinishing every 2–5 years
- Vulnerable to rot at base without proper maintenance
- Highest lifetime maintenance cost of any option
Steel vs. Fiberglass vs. Wood — The full picture
Here’s how the three materials stack up across the metrics that actually matter to a Canadian homeowner making a long-term door investment.
| Metric | Steel (Novatech) | Fiberglass (Novatech) | Solid Wood |
|---|---|---|---|
| R-Value Range | R-5 to R-12 Good | R-8 to R-15 Best | R-2 to R-3 Poor |
| Thermal Bridging | Moderate (steel edges) | None (non-conductor) | Low–Moderate |
| Weatherstripping Life | Very Good | Excellent | Fair (seasonal movement) |
| Finish Options | Paint only Limited | Stain or paint Most flexible | Stain or paint Full range |
| Rot / Moisture Resistance | Excellent | Excellent | Poor–Fair |
| Security | Excellent | Very Good | Good |
| Maintenance Frequency | Low 5–10 yrs | Very Low 10+ yrs | High 2–5 yrs |
| Typical Lifespan | 20–40 years | 30–50 years | 15–30 years Variable |
| Upfront Cost | Most affordable | Premium | Wide range |
| Best Canadian Climate For | All zones | All zones | Milder, drier climates |
Which door should you actually choose?
The right answer depends on your priorities, your home’s style, and your budget — but here’s our honest guidance after fitting hundreds of entry doors across the GTA and surrounding regions.
Choose fiberglass if energy performance is your primary goal
If you’re replacing an old, drafty door and want the upgrade that will deliver the most meaningful improvement to your home’s thermal envelope — choose fiberglass. The combination of no thermal bridging, high-density foam core, and exceptional dimensional stability makes it the strongest thermal performer of the three materials. Browse fiberglass entry doors at ECO Glass →
Choose steel if you want strong performance at a more accessible price
A modern polyurethane-core steel door like the Novatech lineup offers excellent energy performance — measurably better than wood, and close to fiberglass in many real-world scenarios. If your budget doesn’t stretch to fiberglass, or if you specifically want a clean contemporary look with bold colour options and the confident feel of a heavy steel slab, steel is the right call. Browse steel entry doors at ECO Glass Windows And Doors →
Wood: only if aesthetics genuinely outweigh practicality
Wood has irreplaceable visual appeal, particularly on heritage homes. If authentic appearance and the ability to truly refinish and restore the door over decades are priorities — and you’re fully committed to the maintenance schedule — a quality wood door can be the right choice. But go in with eyes open.
“In a Canadian climate, the question isn’t just ‘what does this door look like today?’ It’s ‘how is this door performing in January 2036?’ That’s where fiberglass and steel earn their keep.”
Whatever material you choose, the quality of installation matters as much as the product. See the full doors range and talk to our team about what’s right for your home.
Get an honest assessment — no pressure, no guesswork
We’ll help you choose the right door for your home, your climate zone, and your budget. Steel, fiberglass, or anything in between — we’ll give you a straight answer.
Frequently Asked Questions
A poorly insulated entry door can account for up to 11% of a home’s total heat loss. Older wood doors and uninsulated steel slabs are the worst offenders, while modern insulated fiberglass and polyurethane-core steel doors dramatically reduce that figure.
For Canadian climates, aim for a minimum of R-5 in any new door. A standard steel door with polyurethane foam core achieves R-5 to R-12. A premium Novatech fiberglass door can reach R-8 to R-15 depending on thickness and configuration. The higher the better, especially in zones 5–7 (most of Ontario, Quebec, and the Prairies).
Generally yes. Fiberglass doesn’t conduct heat the way steel does, eliminating thermal bridging at the door edge. Coupled with a polyurethane foam core, fiberglass consistently outperforms steel in measured U-factor and overall thermal resistance. In practice, a top-tier steel door comes close — but a comparable fiberglass unit usually holds an edge in cold-climate thermal performance.
A quality fiberglass entry door handles extreme freeze-thaw cycles without warping, rotting, or requiring repainting. Most quality fiberglass doors carry 10–25 year warranties and can realistically last 30–50 years with basic maintenance — primarily hardware lubrication and occasional cleaning.
Replacing a drafty 20-year-old wood or steel door with a modern insulated fiberglass unit can reduce door-related heat loss by 50–75%, typically yielding a payback of 5–10 years through energy savings alone — before accounting for reduced maintenance costs and improved comfort.
Yes — Novatech is a leading Canadian door manufacturer producing both steel and fiberglass entry doors with high-density polyurethane foam cores, triple-point locking systems, and thermally broken thresholds, all optimized for Canadian energy performance standards. ECO Glass Windows And Doors carries Novatech’s full lineup. View our door collection →