Insulatiion Required For A Hot Roof

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.

Insulatiion required for a hot roof.

Measure the depth of your current insulation. Water is insulation s enemy. Cold deck or cold roof is where the insulation is below the roof deck and the associated joists. R 38 is the industry standard and the minimum thickness for r 38 is 12 inches.

However you may not be familiar with these concepts particularly what they mean and the pros and cons of each. Calculate additional insulation needed. Pa302 2 ceilings without attic spaces n1102 2 2 r402 2 2. See the department of energy s doe ranges for recommended levels of insulation below.

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. 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. Measure the area needing insulation. Insulation level are specified by r value.

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. Typically a gap will have to be left for ventilation because this is a cold area. 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.

The benefits of a conditioned attic. The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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. 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.

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. R value is a measure of insulation s ability to resist heat traveling through it. 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. Minimum insulation r value requirements non residential above roof deck.

Box out light fixtures.