Does rigid foam suit a Dieppe garage door?

Rigid foam insulation panels are a practical and effective choice for insulating a Dieppe garage door, and they're one of the most popular DIY upgrades for NB homeowners looking to take the edge off a cold garage in winter.

The most common approach is EPS (expanded polystyrene) foam board — the white beadboard panels available at any NB building supply store. You cut panels to fit each door section using a utility knife and straightedge, then friction-fit or adhesive-bond them into the recessed frames on the back of the door. A 1.5-inch EPS panel gives you roughly R-6, and a 2-inch panel gets you to about R-8. That's not going to turn your garage into a heated living space, but it meaningfully reduces heat loss and makes the garage noticeably warmer on those -20°C Dieppe mornings. XPS (extruded polystyrene — the pink or blue board) is a step up in performance at R-5 per inch and handles moisture better, which matters in Dieppe's coastal environment where humidity and condensation on cold surfaces are real concerns.

For a typical two-car garage door (16 feet wide by 7 feet tall), you're looking at roughly $80–$200 in materials depending on foam type and thickness. Pre-cut garage door insulation kits are also available at big box stores and come with foil-faced foam panels and tape — these are a convenient option if you'd rather not cut panels yourself, though they tend to be thinner (R-4 to R-6) than what you can achieve with a custom cut.

A few things to keep in mind for Dieppe specifically. Coastal communities along the Petitcodiac and the Bay of Fundy corridor see persistent wind and higher humidity than inland NB — this means your garage door is likely working harder than average against infiltration. Foam panels address conductive heat loss through the door itself, but they do nothing for the air gaps around the door perimeter. Pair your foam upgrade with new weatherstripping on all four sides of the door and a good door bottom seal — this combination will do far more for comfort and energy savings than foam alone.

Also worth noting: adding foam panels increases the weight of the door, which can put extra strain on the springs and opener. Most standard residential garage doors handle the added weight of foam panels without issue, but if your opener is already struggling or your springs are old, have them inspected before adding insulation. A door that's out of balance after insulating can wear out the opener motor prematurely.

This is a solid DIY project — no permits required, no professional needed, and the tools are minimal (utility knife, tape measure, straight edge, gloves). Most homeowners complete a single-car door in an afternoon and a double door in a day. If you're also considering insulating the garage walls and ceiling to create a more usable heated workspace, that's where a professional insulation contractor adds real value — particularly for spray foam on the rim joists and ceiling, or blown-in for the ceiling cavity above.

If you're planning a broader garage insulation project in Dieppe, New Brunswick Insulation can match you with a local contractor for a free estimate — find insulation professionals in your area through the New Brunswick Construction Network directory at newbrunswickconstructionnetwork.com/directory?category=insulation.