Insulatiion Required For A Hot Roof

See the department of energy s doe ranges for recommended levels of insulation below.

Insulatiion required for a hot roof.

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. 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. 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. Water is insulation s enemy.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. R value is a measure of insulation s ability to resist heat traveling through it. Box out light fixtures. 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.

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. Cold deck or cold roof is where the insulation is below the roof deck and the associated joists. 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. Iecc 2015 requirements by climate zone 3.

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. However you may not be familiar with these concepts particularly what they mean and the pros and cons of each. Insulation level are specified by r value. Calculate additional insulation needed.

Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be. A hot roof is one where there is no ventilation required as the insulation is directly attached to the roof sheathing. The higher the r value the better the thermal performance of the insulation. R 38 is the industry standard and the minimum thickness for r 38 is 12 inches.

Typically a gap will have to be left for ventilation because this is a cold area. The benefits of a conditioned attic. Measure the depth of your current insulation. Minimum insulation r value requirements non residential above roof deck.

Pa302 2 ceilings without attic spaces n1102 2 2 r402 2 2.