wait until the rain stops (several days acording to forcast) and timber has dried or go ahead and replace the felt in the gaps between the showers. Basically I'm concerned that if I nail into the wet, and therefore swollen, wood, once the sun comes out and dries it the nails will be loose. Inside getting pretty sodden, but the floor is varnished so that's of less concern.
If I do wait, is it worth treating the exposed wood while I'm at it - shed was a kit and treatment minimal.
TIA
Marshal