Insulatiion Required For A Hot Roof

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.

Insulatiion required for a hot roof.

Minimum insulation r value requirements non residential above roof deck. 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. 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. See the department of energy s doe ranges for recommended levels of insulation below.

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. Box out light fixtures. R value is a measure of insulation s ability to resist heat traveling through it. The higher the r value the better the thermal performance of the insulation.

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. Insulation level are specified by r value. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. 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.

However you may not be familiar with these concepts particularly what they mean and the pros and cons of each. Typically a gap will have to be left for ventilation because this is a cold area. R 38 is the industry standard and the minimum thickness for r 38 is 12 inches. 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.

Measure the area needing insulation. Cold deck or cold roof is where the insulation is below the roof deck and the associated joists. Pa302 2 ceilings without attic spaces n1102 2 2 r402 2 2. 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.

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. Calculate additional insulation needed. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Iecc 2015 requirements by climate zone 3.

Measure the depth of your current insulation.