Have an existing porch and wish to add three season functionality? We offer ExpanseTM porch enclosures for homeowners just like you. Retractable screen technology provides protection from bugs and other outside elements while enjoying top and bottom ventilation. The dual sash panels are uniquely designed to optimize natural airflow and comfort. Easy to operate, the retractable panels simply disappear when closed. Do-it-yourself or we can do the installation for you.