Roof Colour and reflective finishes

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Roof Colour and reflective finishes

Postby karlajensen » Fri Jan 28, 2011 12:19 am

Got a quote for the you beaut heat reflecting paint today.
$5K

did some reading....
a nice white surface is within a few percent of any such finish, including ceramic or nano paints.
Solargaurd and several other brandss have primerless white finishes at bunnings for a little over $10 a litre
I got one with lifetime warranty not to crack peel or do anything else 6L should do 90m2.

Did the edges tonight will spray the main body of it 5am Saturday morning.
It will get a baptism of fire with forecasted 40deg + later that day.

I must say it looks promising, with just a little head torch the reflection is far greater than the gal.

Anyway as its cheaper than a couple of bags of fatt batts and i've got mountains of those in there it would certainly be worth a shot
8E + 8W + 8Nth Garage CMS2000-1 with ~4500W in 3 strings of 8.
Fronius Galvo 3.0 inverter with ~6.6kW panels
12x ZNShine + 12x 180W Solarfuns both NW + ZNShine 12x190 facing SE.
Edwards Solar Hot water


Luck Favours the well prepared.
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Re: Roof Colour and reflective finishes

Postby Tracker » Wed Mar 09, 2011 7:56 am

.
Thanks for pointing out the not so obvious.

I find it funny that some will offer elaborate and dramatically expensive solutions to simple problems.
More funny, is the number of folk who believe the rot or perhaps, have the funds to waste on the expensive solution.

What ever happened to the old "Silver-Frost" that we used to paint on the roof.. That bright silver reflective paint.
Plain Gal reverts to a pretty dull gray and hence absorbs the heat..

I wonder how a WHITE tile roof would look !
..
.
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Re: Roof Colour and reflective finishes

Postby bpratt » Wed Mar 09, 2011 11:36 am

Tracker wrote:.
Thanks for pointing out the not so obvious.

I find it funny that some will offer elaborate and dramatically expensive solutions to simple problems.
More funny, is the number of folk who believe the rot or perhaps, have the funds to waste on the expensive solution.

What ever happened to the old "Silver-Frost" that we used to paint on the roof.. That bright silver reflective paint.
Plain Gal reverts to a pretty dull gray and hence absorbs the heat..

I wonder how a WHITE tile roof would look !
..
.


A white zincalume doesn't look too bad on our white hardiplank house. Yes, it almost 'glows in the dark' when you look at it of a daytime. :)

Plain Gal and plain zincalume both go to a dull gray, albeit the zincalume keeps its brightness for a lot longer than plain gal.

Just driving around the streets you see people with colourbond roofing in dark colours, and you wonder what it costs to keep their house cool on a sunny day.
Kaco 6600
26 x Trina Honey 250w panels. (wish I could work out how to upload to pvoutput.org)

New house build :-
http://bandlnewhomebuild.blogspot.com

My weather station :-
http://jimboombaweather.com
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Re: Roof Colour and reflective finishes

Postby karlajensen » Thu Mar 10, 2011 3:15 pm

I have seen a tile roof painted white and although it caught my eye immediately, it didnt look bad.
would all depend on where you had it.
In Melbourne inder a shady tree the moss growing on it might not look too great after a couple of years

Here's the latest nearmap link to my place, as you can see I'm getting there slowly as time and weather conditions permit (no good painting it when the roof is at 80degC)
http://www.nearmap.com/?ll=-31.94974,11 ... d=20110215

from the inside the result is encouraging with the unpainted bits too hot to hold hand on for long and painted bit is just warm.

all up will be about $100 in paint to do the easy access bits that aren't too visible from the street.
Reluctant to paint the Nth facing bit as I have lots of panels to mask up :?

karl
8E + 8W + 8Nth Garage CMS2000-1 with ~4500W in 3 strings of 8.
Fronius Galvo 3.0 inverter with ~6.6kW panels
12x ZNShine + 12x 180W Solarfuns both NW + ZNShine 12x190 facing SE.
Edwards Solar Hot water


Luck Favours the well prepared.
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Re: Roof Colour and reflective finishes

Postby variflex » Fri Mar 11, 2011 11:58 am

Certainly not short of panels on that roof there, makes my 12 panels look amature
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Re: Roof Colour and reflective finishes

Postby karlajensen » Sat Mar 12, 2011 9:51 pm

12 is a good start -well done.

I'd love another couple of KW but the rules in WA limit inverters s to 5KW hence it requires me to throw a perfectly good inverter and replace it with a 3KW unit and just another 7 panels.

Doesnt look like the missus will approve that purchase anytime soon...... :?
8E + 8W + 8Nth Garage CMS2000-1 with ~4500W in 3 strings of 8.
Fronius Galvo 3.0 inverter with ~6.6kW panels
12x ZNShine + 12x 180W Solarfuns both NW + ZNShine 12x190 facing SE.
Edwards Solar Hot water


Luck Favours the well prepared.
User avatar
karlajensen
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Posts: 1346
Joined: Tue Oct 13, 2009 9:30 am
Location: Perth


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