Re: using tarp under tent in winter necessary?

I never use a groundsheet under any tent in snow camping, I tried it and found that snow trapped between it and the tent floor can melt and thus make pools of water which can penetrate your floor and make your tent wet.

I always use a "footprint" under my four tents and usually an ID groundsheet in my Kifaru 8-man tipi. I own two Hilleberg and two Integral Designs tents and at the cost of these, I am going to use the GS to protect them.