Posted: 24/02/2014 at 06:50
I agree, in my long experience of ivy it will not re-attach - this is what happens to ivy and it will grow again from the base.
You're fortunate that it happened this way and peeled off - many times the combination of wind and the weight of the ivy will bring a wall down.
Cut the ivy back at the base and use the opportunity to do any repairs to the wall that are necessary - this will prolong its life and enable it to cope with the weight of future growths of ivy for many years to come.
This is an opportunity - grasp it