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Foam Insulation board behind siding.

Posted on by Elite Home Exteriors NW

Greenspan Fanfold Foam Insulation weather Barrier

Can You Install Foam Insulation Board behind James Hardie Plank Fiber Cement Siding, Vinyl Siding or Cedar Siding?

It’s very common to install foam insulation board over the subwall before siding is installed. This does help with energy efficiency and approved per manufacturer guidelines.

James Hardie and other siding manufactures allow up to 2” of foam backer to be installed. Remember when you are adding foam, you are building out away from the walls. Sometimes this can cause siding and window trim to stick out past the window frame. Contact us for more advice on what size foam board you should have installed.

Dow Foam Board can increase the R- Value of the wall by up to 20% and is made from Polystyrene. 2” Dow Foam has a maximum R- Value of 10 (4’x8’ sheet 2” thick).

Contact us for a FREE inspection and to get an opinion on your exterior envelope condition.

WA 360-605-9030
OR 971-978-8775

Elite Home Exteriors NW Warranty –
Elite Home Exteriors NW also includes a LIFETIME Labor warranty to any Full Home or Full wall reside because we install all products to Manufacturer Guidelines and state building code. Committed to Quality Rain or Shine!

Vinyl Siding Foam Insulation Board Installation Contractor



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