0 Helpful?

Difference between Climate Zone 5 and 4 Marine

We are working on a 5 story wood framing over concrete podium senior living facility in Thornton, Illinois. I am trying to understand the difference between Climate Zone 5 and Zone 4 Marine.

Looking at the Blog Post on this website, "Calculating the Minimum Thickness of Rigid Foam Sheathing", the table on the second page lists the recommendations for Foam Sheathing Thickness, and there is a considerable difference between the Climate Zone 4 Marine, and Climate Zone 5? But, each map I have looked at shows that Cook County, Illinois is both/the zones are the same?

Any feedback would be great.

Thank you

Asked by Andrew Buck
Posted Jul 1, 2014 10:44 AM ET


2 Answers

Select your preferred way to display the comments and click "Save settings" to activate your changes.

First of all, you are correct that Illinois is in two climate zones. The northern half of the state is in Climate Zone 5A, and the southern half of the state is in Climate Zone 4A (not Zone 4 Marine).

I will post an image below to help you decide whether you are building in Climate Zone 4 or Zone 5.


Climate zone map for Illinois - 2.jpg
Answered by Martin Holladay
Posted Jul 1, 2014 11:11 AM ET


Here is the link to the Climate Zone Map for the entire country:
Climate Zone Map.

Answered by Martin Holladay
Posted Jul 1, 2014 11:14 AM ET

Other Questions in Energy efficiency and durability

Manual J, D, S

In Mechanicals | Asked by Kasey Doggett | Jul 25, 17

Curious on thoughts about insulation on a new house.

In General questions | Asked by user-6782048 | Jul 25, 17

Indoor Humidity Levels - Magnitude of Risk and Solutions

In Energy efficiency and durability | Asked by Patrick McCombe | Jul 25, 17

Vented dryer depressurization and it's effects on radon levels?

In Mechanicals | Asked by Calum Wilde | Jul 24, 17
Register for a free account and join the conversation

Get a free account and join the conversation!
Become a GBA PRO!