What are the downsides of roller garage doors?

The downsides of roller garage doors include lower insulation, higher cost, limited design options, and maintenance issues compared to sectional overhead doors. Roller garage doors, which roll up into compact coil above opening like window shutter, are popular in UK and for commercial use, but have downsides. First, insulation is poor, roller doors are typically single-layer steel or aluminum slats with little insulation, R-value 2 to 4, versus sectional doors with polyurethane foam R-12 to R-18, making roller doors less energy efficient for Canada and cold climates, leading to higher heating costs. Second, cost is higher for insulated roller doors, with good insulated roller costing 2,000 to 4,000 dollars versus 1,200 to 2,500 for sectional. Third, design options limited, roller doors come in few colors and no carriage house or raised panel designs, looking industrial rather than decorative, reducing curb appeal. Fourth, security can be lower as thin slats can be forced, though some have locks. Fifth, repair is difficult, if one slat damaged, whole curtain may need replacement. Sixth, headroom requires space for coil box, which can reduce clearance. Seventh, noise, roller doors can be noisy when rolling. So downsides of roller garage doors are poor insulation making them bad for cold climate, limited aesthetic choices, higher cost for insulated version, and difficult repairs, making sectional overhead doors better for most homes in Canada and US where insulation and curb appeal matter.