What R-value do I need for cathedral ceiling?
In Climate Zones 4, 5, 6, 7, and 8, most prescriptive building codes require ceiling insulation to have a minimum R-value of R-49.
What R-value do I need for vaulted ceiling?
R-30
In moderate climates, insulation with R-19 or R-30 thermal values is often sufficient. In colder regions, builders install ceiling insulation with thermal values up to R-49.
What is the best way to insulate a cathedral ceiling?
In general, closed-cell foam is the best choice for unvented cathedral ceilings. It is also one of the most expensive, and most building inspectors will not allow it to be left uncovered (for fire-code reasons). Foil-faced iso-board can be cost-effective insulation for finished attics and cathedral ceilings.
What is the best insulation for vaulted ceilings?
Most home contractors would probably tell you that the best insulation to use for a vaulted ceiling is fiberglass insulation. The main reasons are that fiberglass is one of the most inexpensive types of insulation that you can purchase, and fiberglass batts are relatively easy to install in vaulted ceilings.
What insulation is required for a vaulted ceiling?
Thankfully, when it comes to your vaulted ceiling insulation requirements, there’s a new innovation on the market: spray foam insulation. This multi-purpose product is ideal for vaulted ceilings, as it can be sprayed and applied straight onto the roof between rafters.
What insulation do you use for a vaulted ceiling?
Should a cathedral ceiling be insulated?
Cathedral ceilings are beautiful, but they must be properly insulated to keep ceiling temperatures closer to room temperatures. To do this, the cathedral ceiling must be built with space between the roof deck and your home’s ceiling for adequate insulation and ventilation.
Should cathedral ceilings be vented?
Ice dams may cause water to flow laterally underneath a steep-slope roof covering and eventually enter a building’s interior. For these reasons, cathedral ceilings should be ventilated. Ventilation is the movement of air to reduce heat and/or moisture accumulation between buildings’ interiors and exteriors.
Can cathedral ceiling insulated?
Cathedral ceilings built using 2 x 12 roof rafters allow enough space for the fiberglass batt insulation and a 1.5″ gap for ventilation. Note: Most experts agree that closed-cell foam is best for unvented cathedral ceilings while vented cathedral ceilings can be insulated with less expensive open-cell foam.