Flat Roof Insulation Requirements

From there the flat roof system you choose will determine the materials you apply.

Flat roof insulation requirements.

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. There must be a slope of 1 80 part h of the building regulations regarding drainage state that water should drain to one or two edges waterproofing should extend up the adjacent walls at least. This means that your approach to insulation will differ from a standard pitched roof.

If insulation is installed below the flat roof deck this is called a cold roof. Consider geography budget and use for the roof to determine the best option. Hot roofs have the roof deck then insulation then the roofing material. We recommend having at least 20 r value worth of material for optimal energy efficiency.

Attic space enclosed rafter or joist space above normally occupied and conditioned interior space assemblies as an economical arrangement of roofing and insulation materials. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. Insulation requirements for roofs are therefore spread across ibc chapters 12 13 and 15. The answer depends on the type of roof you have.

The insulation may be fully or partially bonded to the vapour control layer or laid loose. Applicable roofing assemblies designers may view unvented attic i e. 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 international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.

See the department of energy s doe ranges for recommended levels of insulation below. Laying flat roof insulation as a rule any roof with a pitch below 10 is classified as a flat roof. 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. If the insulation has a sufficiently high vapour resistance a separate vapour control layer may not be required and the.

For a 1 inch board equivalent of 6 r value. Any type of roof from tpo to epdm can be either hot or cold. Where insulation is mechanically fixed the fixings must be of sufficient length to. A cold roof or hot roof.

It is top quality and the most cost effective product for your flat roof. It depends on where the insulation is installed. While expensive the best insulation is polyiso rigid foam. A note to consider before construction.