Replies

1. Expert Member
   Dana Dorsett | Nov 12, 2018 04:28pm | #1

   Most siding can be installed over 2" foam on 24" o.c. AF stud framing, but most will require 1x furring through-screwed to the studs with timber screws, penetrating the studs by at 1.5" or more. Some vinyl siding products aren't design to be readily compatible with 24" o.c. fastener spacing, but most siding types can be mounted on 24" o.c. furring.

   There are purpose designed EIFS (faux-stucco on foam) siding solutions that would not need the furring.

1. 
   Coop54 | Nov 12, 2018 05:02pm | #2

   Dana, sorry I forgot the furring strips. I wanted to use LP Smartside but. everything I have read requires 16"oc. I will contact Diamond Kote and see what they require.
   Thanks!

2. GBA Editor
   Martin Holladay | Nov 13, 2018 05:36am | #3

   Coop,
   You may want to check out an old Q&A thread on this issue: "Fiber cement siding over furring strips."

   Here's a relevant section from my comment on that thread:

   Hardie instructions permit the installation of their [fiber-cement siding] products on framing that is spaced 24 inches on center. The company also provides instructions for installations over furring strips.

   Here are links to two relevant documents:

   HardiePlank Lap Siding installation instructions

   Applying James Hardie Siding over Continuous Insulation and Non-Nailable Substrates

3. 
   Coop54 | Nov 13, 2018 02:44pm | #4

   Thanks Martin, not a big fan of fiber-cement siding.
   I did get a response from LP Smart side and they have changed their instructions recently to include AF stud framing with up to 4" of styrofoam!