bridges? They were not to protect a traveler, his
horse, or a load of hay. Covered bridges were not to
protect a horse from shying at the sight of running
water. Used as a haven from storms they may also have
served as a romantic stop for a couple coming home from a
Bridges were covered to protect the wood. Preservatives for wood were not available; once they did exist it essentially eliminated the need for covered bridges.
Plank floor, truss bottom chords and floor beams require treatment if it is known that these members will be alternately wet and dry from road traffic. As in buildings with roof cover, preservative treatment should not be a normal requirement in covered bridges.