Tips · 4 min read
If your sliding door works fine in the morning but becomes difficult to open in the afternoon, you are not imagining it. Thermal expansion is a real phenomenon that affects aluminum door frames in South Florida's intense heat — and it is more pronounced here than almost anywhere else in the U.S.
Aluminum expands when heated. On a 95°F South Florida afternoon, a west-facing aluminum door frame exposed to direct sun can reach surface temperatures of 140–160°F. At those temperatures, the frame expands enough to put pressure on the glass panel and the track, creating binding friction.
It's probably heat if: The door slides easily in the morning and early evening but sticks in the afternoon. The problem is more pronounced in summer than winter.
It's probably hardware if: The door is stiff all day, makes grinding noises, or the difficulty has been worsening over months. This points to worn rollers or track damage that needs repair.
If thermal expansion is the cause, a technician can adjust the roller height to create slightly more clearance in the track — reducing binding during peak heat. This adjustment takes 15–20 minutes. If rollers are worn, we replace them with marine-grade hardware and perform the same adjustment.