Tarp: a new strategy

When I left here on August 9th, I knew I wasn't going to be down at the site for almost three weeks, and fearing the weight of the water on the tarp again I decided to try a new strategy.  This time I left the holes in the roof tarp so any pooling water would be able to drain.  I put a second tarp on the floor that would catch any water and direct it out the door.  Brilliant, right?  Not quite.

Looked pretty good on arrival... tarp still nice and tight:

Inside, everything appeared to work as planned.  The bit of pooling water had drained down onto the floor tarp and overflowed out the door onto the ground.

But when I peeled up the floor tarp I found this... a wet, slippery mess.

I'm not sure how the water got under the floor tarp, but the water on top had not let any air in so it had been sitting there wet for days or maybe even weeks. The plywood floor was soft and spongy in parts, and the liquid on top was thick and slippery like vegetable oil.  I'm not sure why it was slippery... maybe something leeching from the wood?

So, in the end it seems letting the wood get wet then dry would have been a better option than having the tarp on the floor which ended up preventing the floor from drying.  A good lesson as I move towards installing the building envelope... water WILL get in, one way or another.  Best thing you can do is allow it a way to dry.