The property was originally a one room workers’ cottage (19’x28′) built around the 1860s in Milwaukee. In 2014 the home was poorly renovated. A cathedral ceiling was created in the original one-room structure and a rear addition (20’x20′) was added with a flat ceiling and attic space above. The gable roof has a ridge vent but there are no soffits and very little overhang to add soffits.
The rear addition shingles curl and fall-off because the attic is too hot. The original section has a cathedral ceiling and does not have the curling issue.
We can only vent to one end of the rear addition because the other gable end connects to the cathedral ceiling of the original section of the home.
Welcome any recommendations to properly vent the rear addition.
Replies
Soffit vents are key so the air can flow in the soffit and out the ridge. If you have curled shingles it sounds like you need a roof anyway so when you tear it off add soffit vents and baffles inside the attic space so air can flow below the roof deck. Maybe you can sister rafter tails onto the existing rafters so you can create a bigger soffit. There are many Fine Homebuilding articles about soffit vents and venting.
Alternately there are unvented roof assemblies created by using spray foam on the underside of the roof decking. It's not my favorite choice, but there are many roofs built like that out there. Spray foam is expensive but it would save you carpentry work.