We planned to use roofing felt over the T&G for the roof. This area is not quite as concerning for me since we should be able to get it covered pretty quick. My biggest area of concern is the left wing of the timberframe over the dining room and kitchen. This part of the timberframe is the single story section. We have to get the T&G down then build an entire second story + roof on this area before its protected. Not to mention running any electrical and mechanicals between floors before we can lay subfloor and start building the second floor.