On Apr 2, 6:05 am, (Herb and Eneva) wrote:
I have a wooden deck. open on all sides and covered with a v groove
tin roof. When the weather is damp I get drops of water forming on the
underside of the roof and then dropping on the deck furniture. What
causes this and how can I prevent it? Thanks for any reply

The cause is condensation on the metal surface.

The solution is not necessarily simple if it is an open space -- what
is needed is either sufficient air movement or warmth below the roof
to keep it above condensation temperature (dewpoint) or dry the area.
If the roof had sufficient slope, could make it run to the lower edge
possibly, but w/ a shallow slope there's not much of a way to cause
that without having a collection system -- or, of course, move to a
drier climate.