Originally Posted by mattd2
So did you have more boil off than expected? If this is the case I'd top up with plain water as you would more likely hit you OG target than adding extrat wort. Would seem about right too - 74 *4.2 / 5 = 62
Thanks to all for all of the replies. To answer the above, I ended up with more boil off than expected. My initial question was for future batches in case this happens again.
I'm now also wondering if I collect extra sparge water to put aside until after the boil and I don't boil that extra sparge water for an hour, but use it to top off in my fermenter if I will get DMS in my brew?
Based on the above with my future batches I'm leaning towards topping off with a little spring water if my gravity is high enough.