Insulatiion Required For A Hot Roof

Insulation level are specified by r value.

Insulatiion required for a hot roof. If you have been considering a new roof installation looking into adding insulation to your home or are planning to build a new house you may have heard people talk about hot roof and cold roof systems. Box out light fixtures. While some try to do this with fiberglass or cellulose their efforts are for naught and quite simply it is not allowed by any legitimate building code out there. Water is insulation s enemy.

Browse product options or contact your local insulfoam rep to help you quickly pick the best products to simplify your building envelope needs and fit your project budget all with one supplier. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. The higher the r value the better the thermal performance of the insulation. R value is a measure of insulation s ability to resist heat traveling through it.

Measure the area needing insulation. Minimum insulation r value requirements non residential above roof deck. Iecc 2015 requirements by climate zone 3. Cold deck or cold roof is where the insulation is below the roof deck and the associated joists.

Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense. Pa302 2 ceilings without attic spaces n1102 2 2 r402 2 2. However you may not be familiar with these concepts particularly what they mean and the pros and cons of each. If your current insulation is only 5 inches deep you ll need to add seven inches of insulation to achieve the 12 inch r 38 rating.

See the department of energy s doe ranges for recommended levels of insulation below. A hot roof is one where there is no ventilation required as the insulation is directly attached to the roof sheathing. The benefits of a conditioned attic. Typically a gap will have to be left for ventilation because this is a cold area.

Where the design of the roof ceiling assembly does not allow sufficient space for the required insulation such as cathedral ceilings the minimum required insulation for such roof ceiling assemblies shall be r 30. Calculate additional insulation needed. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies.

R 38 is the industry standard and the minimum thickness for r 38 is 12 inches.