R 50 is a common option.
Post and beam roof insulation.
Add more insulation underneath the existing ceiling wood then install a vapor retarder retarder not barrier.
Higher r values can be obtained with an additional layer of insulation.
Remove the roofing materials and install 4 8 inches of rigid foam insulation board above the roof decking then new roof sheathing over that then new roofing materials.
There are several ways to insulate the frame.
A smart membrane not poly sheeting then cover that up with drywall.
Material prices can range from as little as a 1 0 per square foot to as much as 5 00 per square foot.
The panels are called sip s structural insulated panels.
2 beveled interior finish blocking included for placement above plate beams between rafter bays.
Normally the insulation is either built up above 2x ceiling roof decking that is installed on top of the trusses or sips structural insulated panels are installed on top of the timbers the range of insulation is dependent on the thickness of the sips or of the built up insulation.
Your total cost will depend on the type of insulation you use.
Blankets of insulation post frame buildings are one of the easiest buildings to insulate because of the characteristics of the structure.
This structure consists of large vertical posts set in.
To the right is a picture of a typical wall roof system.
Stress skin panels are used to carry loads and also insulate roofs.