We have 2 areas on our siding that are bowing. Directly above these areas on the roof are exhaust vents. We have noticed they have ice at times and wonder if this is causing our problem. The vents go through the attic and we think they are fine but why is there ice forming outside? How is the warm air getting out to create this? Also why does it appear to be affecting the siding and the wood under it to bow outward?
Need some help