Foam sheets on underside of this ceiling to stop ice dams?
One room on the east side of the building has a cathedral ceiling with NO insulation. The ceiling is made from 2x6 T&G spanning 8 Ft on center, with the ends supported by walls and the center by a truss. The other rooms have an attic.
We would like to add insulation to the underside of the cathedral ceiling and are considering:
a) Two layers of 2”polyiso
b) Two layers of ¾ polyiso
c) 1x6 carsiding
(1) Do I nail the first layer to the ceiling or then to each other to hold in place?
(2) Should I use canned foam (what type) to seal the edges?
(3) Should I tape the seams on each layer or just the final layer(metal faced tape)?
(4) How should the carsiding will be mounted under the foam
1x4 screwed to the ceiling through the foam or
2x6 24 on center and along the walls ( creates a thermal bridge but gives a way to mount lights)
(5) how can I mount lights and fans?
Any help would be appreciated
this building is a nature center in SE WI.
and are faced with high energy costs and ice dams.
Posted Wed, 01/08/2014 - 18:33
Edited Thu, 01/09/2014 - 12:27
Other Questions in Energy efficiency and durability