Count your blessings southern seacrafters

[bigeasy1]

Originally Posted by oldfielder

One thing I learned about propane heaters last winter redoing an 18 foot Steiger deck and stringers is that they create quite a bit of vapor, so depending on what you are doing just keep an eye on that. Depending on the dew point, temp, etc,once you turn them off you can actually create a situation where you create enough vapor inside your structure that you will get condensate once you shut the heater down.
It was more important when painting than when glassing.

Yup,you got that right.
A good friend of mine finished off a 30' South Shore down east boat in Maine in a beautiful structure that he built.He glued up several large bows out of 1x3's (like trusses),installed them on top of a 4' high knee wall,and then had the entire structure shrink wrapped.Even had an aluminum storm door for entrance.It was huge space.
He heated it with an old warm air furnace,with flexible ducting that he could move where ever the heat was needed.

The first time he fired it up, it was thumbs up,then after a while in the cold Maine temps with the heat from the furnace warming the interior,it basically started raining inside,from the large amount of condensation.
He had to make a rain catcher out of more shrink plastic hung about a foot from the top cover which directed the water out of the building.