We have an accessory building under construction with a sloped roof 8′ to 10′ pitch (2/12) and a metal roof was installed, including a blueskin ice and water shield. The back of the roof has a 12″ overhang, the sides and front are 24″ – all water slopes to the back. 

We are now in winter in Southern Ontario and our materials were delayed so set to put on the soffit/fascia and eaves (and siding) next week. The soffit is not vented due to the ‘hot roof’.

The interior of the building has rafters that were not closed off during framing at the front and back. The roof has R31 closed cell spray foam front to back in the interior and they used batts at the edges as the backing to this since there was no blocking in the framing.

So, now with winter, I’m seeing icicles on the edge of the roof. There is no insulation there as it is outside the building. Is there something we should/can do, like add insulation to that 12″ section? Something else? I’ve also seen those de-icing cables, so perhaps that’s the easiest solution.

Edit to add: we don’t have any heating yet and have had a block heater going at about 12 to 15 degrees C on average for the interior for the work happening in there.

Thank you