C402 2 roof assembly exception 2 allows a 1 inch insulation thickness variation 4 0 prescriptive r value slope 1 4 12 low point 1 less insulation allowed.
Iecc 2015 roof insulation.
Roof replacements shall comply with section c402 1 3 c402 1 4 c402 1 5 or c407 where the existing roof assembly is part of the building thermal envelope and contains insulation entirely above the roof deck.
Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope.
R value based method of section c402 1 3 u c and f factor based method of section c402 1 4.
For roofing replacements it is necessary to look at the ibc.
The iecc 2015 and ashrae 90 1 2013 have the most stringent envelope requirements based on conditioned space and non residential space.
Specific insulation requirements of section c402 2.
In previous versions of the iecc code and ashrae 90 1 standard it was easier to obtain lower insulation values in the roof and walls of metal buildings.
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.
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.
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.
877 775 1769 hunterpanels com 0716 iecc 2015 sec.
Specific insulation requirements of section c402 2 thermal requirements of either.
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.
Iecc 2015 and ashrae 90 1 2013 have the most stringent envelope requirements based on conditioned space and non residential space this means that for the most part contractors will need to use banded liner systems or long tab banded systems in order to meet the stricter insulation requirements.
Each year about 2 5 billion square feet of roof coverings are installed on existing buildings.
Average wall and roof u factor 0 200 in climate zones 1 5 and 0 120 in climate zones 6 8 comply with the roof solar reflectance and thermal.
Roofing specific requirements of iecc 2015 may 18 2017 6 arizona roofing contractors association webinar low energy buildings are exempted those with a peak design rate of energy usage less than 3 4 btu h ft2 10 7 w m2 or 1 0 watt per square foot 10 7 w m2 of floor area for space.
Existing buildings requirements are sprinkled throughout the i codes.
