Can I make my own foil faced insulation?

Take a close look at most the so called "foil" lined rigid foam boards. You'll notice they are nothing more than aluminum painted paper. For all I know, the silver looking stuff might just be silver paint. One thing for sure, it's not aluminum foil - and THAT is what you need. Silver painted plastic or foam doesn't do crap. So, to answer your question, "yes" you would have a more effective product buying the rigid foam and then wrapping it with sheets of aluminum foil. And, the way to buy aluminum foil on the cheap is to get it from restaurant supply companies. Their foil comes in wider and longer rolls (often a slightly thicker foil sheet than what is in supermarkets) and it costs way less per foot than buying it from a supermarket. That's what I did. Good luck!

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Like @keshlam said, a quick search online will tell you what you need to know...

Seems like SilverGlo is a product designed by the Dr. Energy Saver company, which also was the company behind the video you saw. Apparently, this product is simply rigid foam board of the Expanded Polystyrene variety (EPS), covered with their radiant barrier facing. EPS actually has the lowest R-value of all the foam board types.

See: Dr. Energy Saver Rigid Foam Wall Insulation

If you want something with higher R-value, try using one of the other foam board types, like polyisocyanurate or Extruded Polystyrene (XPS). Polyisocyanurate usually comes faced with foil on both sides. You can easily find both at big box stores in a variety of thicknesses.

As for 3" thickness, they might not carry, but you can always stack and glue/mechanically fasten smaller thicknesses up to the thickness you require.

I would also check local distributors/contractor oriented stores that sell to consumers. They may have better pricing and also delivery services. From personal experience, a 4ft by 8ft standard sheet of rigid foam board does not fit inside the small SUVs (RAV4/CRV etc) they make nowadays...

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