Sheds have pre-treated wood inside. We have 29 gauge paneling and aluminum paneling sheds. 25 year limited warranty on floor system. 20 year limited warranty on aluminum siding and life time warranty against rust. 25 year limited warranty on steel siding and 10 year limited warranty against paint chipping and fading. 5 year limited warranty factory workmanship. Carports and Steel Buildings 12 gauge steel legs and 29 gauge steel roof. 25 year warranty on structures. Certified for wind ratings of up to 150 mph. Available in sizes up to 40' wide. Highest quality buildings offered.