Every new-door customer asks me about insulation. The salespeople at the big-box retailers have done a thorough job convincing everyone that R-18 is the floor and R-32 is the ceiling and you're irresponsible if you don't buy at the top.

Here's the honest version: for most Richmond garages, R-value matters less than the marketing says, and a couple of things that nobody mentions matter more.

What R-value actually means

R-value measures thermal resistance — how well an insulating material blocks heat transfer. Higher R = better insulation. Standard residential garage door insulation grades in 2026:

R-value testing is done on the panel material itself, in a lab, at the centre of the panel. It is not the R-value of the assembled door. The assembled door has gaps at the panel hinges, gaps at the perimeter weather stripping, and gaps at the bottom seal. Those gaps reduce the effective R-value substantially.

The trade has a separate measurement called U-factor (or sometimes "whole-door U-value") that accounts for the assembly. It's harder to find in marketing materials because it makes the marketing numbers look worse.

What Richmond's climate actually demands

Richmond's heating degree days (HDD), the standard measure of how much heating a building needs, average around 2,800 per year at YVR weather station. For context:

Richmond is one of the mildest climates in Canada. Our coldest typical winter low is around -7°C, and even that happens for maybe 5–10 days a year. Most January nights bottom out at +1°C to +3°C.

For a detached unheated garage in Richmond, the temperature differential between inside and outside in winter is small enough that R-value differences between R-12 and R-32 are mostly invisible on the heating bill. The garage isn't being heated. Heat loss through the door doesn't show up in the budget because there's no heat to lose.

For an attached garage in Richmond, the door matters more — but the connection between the garage and the heated space is the interior wall and door, not the garage door. A well-insulated interior wall makes the garage door insulation largely irrelevant.

For an attached, heated garage (workshop space, gym, finished room, EV charging in winter): now R-value matters. Now the math actually works.

The three real reasons to buy an insulated door

1. Noise reduction. This is the under-marketed benefit. An R-18 insulated door is meaningfully quieter than an R-6 single-skin door, both for the noise of the door operating (the foam dampens the panel resonance) and for noise transmitted through the door from outside. If you live near No. 3 Road, near Bridgeport Road, near the airport approach (Sea Island, parts of Burkeville, west Steveston), or near any of Richmond's truck routes, the noise reduction alone is worth the upgrade.

2. Heated garages, workshops, gyms. If you're heating the space, you want R-16 minimum. R-18 is the sensible Richmond ceiling. R-25+ is for Calgary, not for us.

3. Durability. Steel-foam-steel sandwich doors are physically stronger and more impact-resistant than single-skin doors. They take a basketball or a backed-up car better. They warp less in heat. In a Richmond summer, an un-insulated south-facing single-skin door can warp visibly. An insulated sandwich door rarely does.

What I actually recommend by use case

The frame question

R-value on the panels is half the story. The frame — the perimeter stops and weather stripping — is the other half. Most builder-grade doors have an uninsulated steel frame around an insulated panel. The frame is a thermal bridge: heat moves through the frame even though the panels are insulated.

Premium doors use a "thermal break" frame, where the inner and outer steel surfaces of the frame are separated by a non-conductive material (usually a hard plastic or thermoset polymer). Thermal-break frames improve whole-door U-factor by 12–25% compared to bridged frames at the same panel R-value.

If you're paying for R-18 panels, the thermal-break frame is worth the extra. If you're paying for R-12 panels, the thermal-break frame is overkill.

The window question

Windows in garage doors reduce R-value dramatically. A 16x7 double door with four standard windows in the top section loses roughly 15–25% of its effective whole-door R-value vs. the same door without windows.

If you want windows for aesthetics: get them, accept the trade-off, and don't pay extra for the highest R-value panels — the windows will undo the benefit. If you want serious insulation: skip the windows, or pay for double-pane insulated glass inserts (which closes most of the gap but costs an extra $385–$745 per window).

The Richmond-specific failure mode I see

Insulated doors fail differently than non-insulated doors. The most common failure I see in Richmond:

Delamination. The foam core separates from one of the steel skins. The door starts to bow, the panel rattles, and rainwater can sometimes get inside the panel and rust the inner steel skin from inside out. This happens to lower-quality insulated doors after about 12–18 years in Richmond's humid climate.

Higher-quality manufacturers (Clopay, Garaga, Wayne Dalton premium lines) use better adhesives and don't delaminate. Lower-quality builder-grade insulated doors from generic offshore manufacturers do.

The buying lesson: if you're going to pay for insulation, pay for the brand-name door. Generic-imported insulated panels are worse than no insulation in Richmond's climate over a 20-year life.

Cost reality check (2026, Lower Mainland CAD) - Single residential door, non-insulated single-skin, installed: $1,650–$2,495 - Single residential door, R-12 insulated, installed: $2,195–$2,985 - Single residential door, R-18 insulated with thermal break, installed: $2,685–$3,685 - Double residential door, non-insulated, installed: $2,495–$3,795 - Double residential door, R-12 insulated, installed: $2,985–$4,185 - Double residential door, R-18 insulated with thermal break, installed: $3,485–$5,685 - Premium R-22 with double-pane windows, installed: $4,485–$7,285 - Insulated panel replacement (single panel only, mid-door delamination): $485–$885

A specific Hamilton call

A family on Wiltshire Place near the Fraser River in Hamilton called me last year about new doors. The house is a 2003 build with two single-car garage doors side-by-side. Both original. Both non-insulated. The garage is attached, unheated, with a bedroom directly above one of them.

The wife wanted R-18 on both. The husband had been told by a friend that "you don't need insulation in Vancouver." Both of them were partly right and partly wrong.

I recommended R-18 on the door under the bedroom, R-12 on the other one. The R-18 cost $385 more than the R-12 — but the noise reduction is what they actually paid for, because the door operates at 6:15 a.m. when somebody leaves for work. The R-12 on the second door is plenty for a Richmond detached-feeling space.

They went with my recommendation. The wife reported back two months later that she could no longer hear the door from upstairs. The husband reported that the heating bill didn't change at all. Both of these things are correct outcomes.

The R-18 on the noisy side bought peace. The R-12 on the other side bought construction quality without paying for thermal performance they didn't need.

That's the post.

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