Insulated Garage Doors

Insulation Is Not Really About Heat

People ask whether an insulated door is worth it when the garage is not heated. In Long Beach the honest answer is that the heat argument is the weakest of the three reasons to buy one.

Reason One: Stiffness

An insulated section is a sandwich. Two steel skins with a core between them, and where that core is foamed in place it bonds to both skins and turns the section into a structural panel.

That stiffness is why insulated doors hold their shape over years of cycling, resist denting better, and do not flex at the corner the way a hollow section does. On a wide double door it is the difference between a door that stays square and one that gradually does not.

Reason Two: Noise

A hollow steel section is a drum. Every roller passing a joint, every bump in the track, resonates through it.

A solid core damps that. Combined with sealed nylon rollers it is the single biggest change you can make to how a garage door sounds from inside the house, which matters if there is a bedroom above.

Reason Three: Temperature

Real, but modest here compared with a cold climate. An attached garage shares a wall with the house, and a converted garage used as a gym, workshop or office is genuinely more usable with an insulated door on it. West-facing garages in summer benefit most.

Polystyrene or Polyurethane

Polystyrene is rigid panels cut and fitted between the skins. Cheaper, adequate insulation, but the panel is not bonded so the section gets less structural benefit.

Polyurethane is foamed in place, expands to fill the cavity and bonds to both skins. Better insulation for the same thickness, and much stiffer. It costs more and it is the better door.

On R-Values

Manufacturers quote R-values and they are not always measured the same way. Some quote the value of the insulation material alone rather than the assembly, which flatters the number.

Compare like with like, and treat a very high figure on a thin section with some suspicion. For most Long Beach homes the difference between a mid and high R-value matters far less than whether the core is bonded.

The Weight Consequence

An insulated door is heavier. That is not a drawback, but it does mean the springs have to be sized to the new weight rather than reused, and an older opener may need its force settings retuned. Both are part of a proper install.

Call Celtichearts at (562) 387-9741.