DIYbanter - View Single Post

Frank[_13_]

On 7/8/2010 7:21 PM, wrote:
On Jul 8, 7:13 pm, wrote:
The front of my house faces the evening sun.
When it's 100 outside, the brown front door is 184 degrees F.
Stuck a square of white insulation board in front of the door.
It got up to 107 degrees.
The light-gray house is at 164 degrees.
I started thinking about painting the front of the house white.
Did some online research and found mention of paint that's highly
reflective in both visible and IR parts of the spectrum,
but nothing on where to buy it.

Most info was about coatings for roofing.

There's even some ceramic sphere additive that claims to
cut solar heat gain to near zero. Seems like if this worked
as well as they claim, it'd be everywhere. Went to big-box
stores and dedicated paint stores. Nobody heard of it.

Will repainting the front of the house buy me anything?
The walls are R19 and the windows are low-E R3.3-ish with SHGC of .3.
Door is fiberglass r5-ish.

Reflective paint recommendations?

Thanks, mike

the ceramic spheres are very costly since they are a realtive of space
shuttle tiles.

white paint will get you less heat gain in summer, but cut winter heat
gain too.....

you could reside adding a layer of foam insulation between the
existing siding and new siding, plus no more painting

foam board is around R6 or R7 per inch.

so you could double your wall insulation

The glass spheres are only a couple of dollars a pound.
Not sure I'd want to paint my door with them as it would look like a
road sign when headlights hit it at night.