I just added on a room and getting ready to insulate. The old part of the
house has R-11, both walls and ceiling. What is the recommended insulation
these days for putting between 2 x 4's? Part of the roof for the new room
includes what was a porch and has only 2 x 4's, not 2 x 6's. Also, will
ceiling tile provide more R value than drywall?

Bob