Exterior Wall Insulation Code

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.

Exterior wall insulation code.

When you are insulating two by four 2x4 and two by six 2x6 framed exterior walls and want to use fiberglass insulation what thickness is best the question becomes all more critical because of the permanent nature of wall assemblies and wall insulation. As with attics or anywhere else in your home adding more layers of insulation to your exterior walls is key to having a higher r value and better thermal performance. The 2015 iecc. Under the 2015 iecc requirements there are more prescriptive wall insulation requirements that include continuous exterior insulation.

Once the insulation is in the wall and sealed up with drywall it is not easy to change out. When designing and building an exterior wall using spray foam insulation you need to take into account code related to. Wall insulation whenever exterior siding is removed on an. Section n1102 1 local codes based on irc 2012.

Section n1102 1 spray foam code local codes based on irc 2009. 2015 code requires walls to be insulated with a minimum of r 20 or r 13 5 13 5 means r 13 cavity insulation plus r 5 insulated sheathing. Add r5 insulative wall sheathing beneath the new siding. Per the 2015 iecc section r104 inspections construction or work for which a permit is required is subject to inspection.

Add r5 to r6 insulative wall sheathing beneath the new. How are insulation materials affected by the code. As an alternative the code allows for a cavity insulation value of r 13 if a continuous board or foam insulation of minimum r 5 is used as a supplement. 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.

This is significant because conventional fiberglass batt insulation is not able to achieve r 20 in a 2 x 6 wall. What you need to know. Section r316 local codes based on irc 2012. Exterior wall insulation value has been increased from r 19 to r 20.

The ontario building code act gives both contractors and homeowners a baseline that ensures safe and comfortable interiors. Each of those points is further qualified for example walls must prevent moisture condensation on the interior side during the winter. If structural sheathing covers 40 or less of the exterior continuous insulation r value shall be permitted to be reduced by no more than r 3 in the locations where structural sheathing is used. Construction or work is to remain accessible and exposed for inspection purposes until approved in some instances inspections can be difficult to examine especially if the insulation is drilled and filled on the existing exterior side of the walls.

Seal gaps around windows and doors with spray foam insulation.