If I attach a rope to two distant rafters and use it as clothesline, would this put excess pressure on the rafters? This is a roof over a deck. I thought it could be handy on a rainy day, but not sure if there is anything I need to consider first.
That would depend on whose clothes you're hanging, Paul Bunyan's or King Kong's??
No, that type of load on the rafters would not pose a problem. You could screw two eye bolts into the bottom of the rafters and tie your clothesline to them or put hooks on he end of the clothesline and then hook it through the eye bolts for easy removal.