https://squareblogs.net/sledsl....eep7/7-simple-secret
Bifold Door Seal Repair The bifold door is a great addition to any house however, it needs proper installation and maintenance in order to function properly. This includes a thorough integrity inspection, lubrication and a report of any problems to avoid them in the future. Bifold doors are designed slightly smaller than their frames in order to prevent sticking. Unfortunately, this can also lead to air leaking in through the gap. Install a weather seal to fix this problem. Seals that ha