Article 1038005 of alt.home.repair:
Path: news.misty.com!not-for-mail
From: nicksanspam@ece.villanova.edu
Newsgroups: alt.home.repair
Subject: Re: Rigid Insulation (Pink sheet stuff) vs. True Board Type 1 (White 
	Stuff)
Date: 7 Aug 2008 15:28:03 -0400
Organization: Villanova University
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Xref: news.misty.com alt.home.repair:1038005

ransley  <Mark_Ransley@yahoo.com> wrote:

>Lean yourself, google, white is uaualy R 3"

Open cell white beadboard is about R4 per inch.

>foil faced polyisocyanurate R 7.2"...

That's about R11, with still air on both sides.

Nick