The really kewl thing about aerogels is their dual function; light transmission plus super insulating; the ability to engineer walls that transmit outdoor light and are highly insulated.  Unfortunately, their cost is a killer, and the fact you pretty much need to custom design, engineer and construct using bulk aerogel product presents multiple challenges.

Mike K,

Stop with the aerogel love affair.  Sure it looks kewl, but its stoooopid expensive.  It has no utility in residential or commercial building construction.

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I have reclaimed/recycled foam board insulation for 50-70 percent less than new material, My material is in good usable condition-retains r levels and is economic and environmentally friendly.

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I looked at aerogel for about 10 minutes until the costs were known.  The thought of interior insulation was also one I had toyed with for years.  It’s room by room at reasonable pace as opposed to the entire bloody house.  It is just not a very good way to insulate.  Can’t insulate the floor joists, or the wall connections, or where the showers and plumbing are.
What do they say, super-insulating on the outside is the worst way to do it, except when you compare it to all the other options.  If they could squeeze the insulation into a thinner cross section, we might have been able to save on the window jamb extensions.

As for the look of the house, I’ve seen one done this way in Concord, Mass and it looks great.  If you didn’t know, you wouldn’t guess.  Don’t hold me responsible for the color, I was out-voted.

External insulation allows the mass of the external walls and roof to store heat and to reduce temperature swings, also it avoids a reduction in living space.  This is a standard approach used to reach Passive House standard energy usage in retrofits.  For certification the Passive House standard requires energy usage for space heating to be below 15 kWh per metre per annum.  This is 90-95% lower energy usage than typical buildings.

but what if you used just better insulation inside, like an aerogel or that foil backed stuff with air pockets. I just wonder which would work better for teh buck. either way, you have some retrofitting to do.

MIke,

Aerogels are kewl to play with, but from a cost perspective they’re ridiculous.  They have no economic viability in residential construction.