Flat Roof Insulation Requirements

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.

Flat roof insulation requirements.

The insulation may be fully or partially bonded to the vapour control layer or laid loose. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. How much ventilation does a flat roof need. If the insulation has a sufficiently high vapour resistance a separate vapour control layer may not be required and the.

Laying flat roof insulation as a rule any roof with a pitch below 10 is classified as a flat roof. Hot roofs have the roof deck then insulation then the roofing material. Attic space enclosed rafter or joist space above normally occupied and conditioned interior space assemblies as an economical arrangement of roofing and insulation materials. In most cases there will not be a loft in a building that features flat roofing.

Continuous insulation zones ashrae 90 1 ashrae 189 1 igcc ibc iecc 2004 2007 2010 2013 2016 2009 2011 2014 2012 2015 2009 2012 2015 0 25 1 15 20 2 15 20 25 3 15 20 25 4 15 20 302535 5 15 20 302535 6 15 20 3035 7 15 20 3540 25 8 20 3540 25 minimum r value non residential above roof deck. Insulation requirements for roofs are therefore spread across ibc chapters 12 13 and 15. The answer depends on the type of roof you have. Where insulation is mechanically fixed the fixings must be of sufficient length to.

It is top quality and the most cost effective product for your flat roof. Applicable roofing assemblies designers may view unvented attic i e. This means that your approach to insulation will differ from a standard pitched roof. Cold roofs have insulation beneath the roof deck which is beneath the roofing material.

A note to consider before construction. While expensive the best insulation is polyiso rigid foam. For a 1 inch board equivalent of 6 r value. From there the flat roof system you choose will determine the materials you apply.

A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. Any type of roof from tpo to epdm can be either hot or cold. You can expect to pay about 55 100 sq ft. It depends on where the insulation is installed.

We recommend having at least 20 r value worth of material for optimal energy efficiency. Consider geography budget and use for the roof to determine the best option. 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. A cold roof or hot roof.