The 2012 International Residential Code IRC allows the construction of unvented attics and cathedral ceilings but includes specific design requirements. To meet durability goals in most applications the airtightness must be provided by a continuous membranepreferably adhered to the top surface of the structural roof deck and under rigid insulation that provides condensation control.
Unvented R60 Osb Sheathing Cellulose Insulation Sheathing
The International Residential Code allows the construction of unvented attics and cathedral ceilings but includes specific design requirements.
Unvented cathedral ceiling insulation. If installed properly it will create an effective air and vapor barrier to keep interior moisture away from the roof sheathing where it can condense and cause problems. This application extends the thermal envelope to include the attic space increasing the energy efficiency of the building and decreasing the potential for moisture problems. Note however that this approach requires deep rafters or scabbed-on 2x4s to add depth.
Un-Vented Hot Roof. A vented assembly with fiberglass or mineral wool insulation. If you dont want to use SIPs or nailbase there are four basic approaches.
Unvented attics also known as conditioned or cathedralized attics are created by applying insulation directly to the underside of the roof deck and omitting or sealing all ventilation paths against air leakage soffits ridge and gable vents. Other Cathedral Ceiling Insulation Tips Tips for insulating a cathedral ceiling take care to seal ceiling penetrations such as around light fixtures or. Ice and Water Shield.
One major benefit of an unvented attic is that mechanical equipment and ducts located in traditional. This is the traditional way to insulate a cathedral ceiling. Minimum of felt paper should be installed as the primary water barrier under the roofing.
Code pushes the envelope - IECC vs IRCIBC. Cathedral ceilings which are constructed using 212 roof joists allow sufficient space for the fiberglass batt insulation and a gap of 15 for ventilation. Control rain In any roof assembly an underlayment eg.
Foil-faced iso-board can be cost-effective insulation for finished attics and cathedral ceilings. When framing the roof of a cathedral ceiling use 2 x 10 lumber for the roof rafters. In unvented cathedral ceilings GreenFiber Stabilized Insulation or GreenFiber Loose-Fill Insulation is Dry Dense-Packed over an air impermeable insulation as prescribed per IRC 2009.
The short answer is that the use of vapor barriers with spray foam in unvented cathedral ceilings is complicated and controversial so there is no definitive answer. All unvented attic and cathedral ceiling designs must provide for either a very high degree of airtightness or avoidance of condensation due to warming of cold surfaces. On roofs that are too difficult to vent a second-best solution is to remove the shingles or.
Closed-cell medium-density spray polyurethane foam ccSPF insulation can be used to create an unvented roof assembly for any climate zone. The insulation must be in direct contact with the sheathing. Unvented spray-applied Insulation.
It is also one of the most expensive and most building inspectors will not allow it to be left uncovered for fire-code reasons. Just have a contractor install spray foam insulation and you will be much happier with an efficient insulation that actually works and controls moisture. In general closed-cell foam is the best choice for unvented cathedral ceilings.
Dont bother with energy wasting venting. Cathedral ceilings GreenFiber Stabilized Insulation or GreenFiber Loose-Fill Insulation is Dry Dense-Packed to a minimum density of 35 lbft3 561 kgm3. By installing SPF insulation spray in place insulation in lieu of mineral fiber insulation in the joist cavity of a flat roof or between rafters of a cathedral ceiling the assembly may perform the same as or better than that of a typical one and venting can be shown to be unnecessary.
In this post we will show that while the ProPink Unvented Insulation System may provide a safe roof in zones 2B 3B if we instead combine dense fiberglass insulation batts or densepacked with INTELLO smart vapor retarder and airtight membrane we can make safe and robust unvented roofs in climate zone 6. 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. The general consensus is that open-cell spray foam is not a good choice here in cold climates.
The insulation must be in direct contact with the sheathing. The extra depth of traditional 2. The illustration shows an assembly with R-38 insulation which is enough insulation for Climate Zones 1 2 or 3.
Regarding the roof insulation closed-cell foam is the best product to use for an unvented cathedral ceiling. Unvented attics are constructed with insulation installed above or below the roof sheathing. 5-12 inches can be filled or almost filled with 12 pound open cell foam or you can go with 3 to 4 inches of 2 pound closed cell foam.
Unvented attics are constructed with insulation installed above or below the roof sheathing. Unvented roof assemblies should be insulated either with air-impermeable insulation rigid foam or spray polyurethane foam or with a combination of foam and air-permeable insulation.
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