Did you read the specs for that stuff?? Applying over asphalt shingles, 4 coats
required at 50 sqft per gallon! Assuming your average 2000 sq foot house has at
least 2500 sq feet of roof, you'd need at least 200 gallons to cover the roof.
I don't know what Home Depot sells that stuff for, but I'd bet it's far less
expensive and more reliable to just reroof with a lighter share of shingle.
In my case, I have 1400 sq. ft of living area . I think initially, it
would take alot to cover the roof but repeat coats in the future
should be far less cause the pores of the shingles would have been
filled . I like the idea of the highly reflective pure white
elastomeric paint to reduce the temperature of the roof deck, attic,
and hence interior.
I bet it is a lot cheaper in bulk. Bulk as in drums, not 5g pails.
Something like that, before I pulled the trigger, I'd at least call the
local commercial roofing houses, and see what they would charge,
assuming they will even stoop to residential work. IIRC, commonly used
to stretch the life of membrane flat roofs. On a shingle roof, I imagine
it would make stripping the roof a living bitch when the time comes.
Like the other guy said, I'd also price out a conventional tearoff and
replace with 30 year shingles in a light color. If the locals would not
call you a freak, I'd also price a metal roof- those can be had in white
or off-white.
snipped-for-privacy@gmail.com wrote the following:
I used Henry Solarflex 287 SF roof paint (also sold at HD) to paint my
400 sq ft sunroom's black shingles white.
It's been a few years now and it is still white.
http://www.henry.com/fileadmin/pdf/current/tds/HE287SF_techdata.pdf
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