Improving isolation in the attic

Progress:
On Friday they put some isolation mats on top of some of the ventilation pipes in the attic - to reduce the loss of heat that has caused a serious problem with icicles (snow melting on the roof even at outside tempereatures well below zero).

I was therefore frustrated when I noticed that there was water dripping from the icicles today, even when the outside temperature was -2C.

• Are the ventilation pipes still leaving too much heat/energy on it's way through the attic....  
• Or, do we now leak heat through the openings in the ceiling isolation that had to be made to get fresh air into each room - and pull exhaust air out of each room?             

I will send the ventilation team a report and hope that they have more actions up their sleeves.