How should I paint my roof white?

I see that Prof Chu says we should paint our roofs white to help combat climate change.
We have a 1930s semi with a normal pitches roof with dark grey concrete tiles on it. It sure does get hot in the loft during the summer.
Any recommendations as to what I can use to paint (I assume) the tiles white?
Guy -- --------------------------------------------------------------------- Guy Dawson@SMTP - snipped-for-privacy@cuillin.org.uk // ICBM - 6.15.16W 57.12.23N 986M 4.4>5.4 4.4>5.4 4.4>5.4 The Reality Check's in the Post! 4.4>5.4 4.4>5.4
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I would start by making sure your loft insulation is up to spec. That helps summer and winter.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
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Andrew Gabriel wrote:

Already done.
Guy -- --------------------------------------------------------------------- Guy Dawson@SMTP - snipped-for-privacy@cuillin.org.uk // ICBM - 6.15.16W 57.12.23N 986M 4.4>5.4 4.4>5.4 4.4>5.4 The Reality Check's in the Post! 4.4>5.4 4.4>5.4
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Guy Dawson wrote:

You need insulation between the rafters if you want the loft cool in summer.
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Stuart Noble wrote:

It's not so much the keeping the loft cool but the reflection of sunlight back into space to avoid heating the atmosphere.
Prof Chu's point is that a lot of solar heating is caused by building being heated by the sun and radiating the heat back into the atmosphere.
If the sunlight could be reflected back into space by white surfaces then we'd help slow global warming.
http://www.climateark.org/shared/reader/welcome.aspx?linkid 8556
Guy -- -------------------------------------------------------------------- Guy Dawson I.T. Manager Crossflight Ltd snipped-for-privacy@crossflight.co.uk
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Guy Dawson wrote:

White tarmac too maybe.
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Stuart Noble wrote:

That's also suggested!
Guy -- -------------------------------------------------------------------- Guy Dawson I.T. Manager Crossflight Ltd snipped-for-privacy@crossflight.co.uk
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On Thu, 28 May 2009 11:05:49 GMT, Stuart Noble wrote:

With black lines?
--
Peter.
You don't understand Newton's Third Law of Motion?
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On Thu, 28 May 2009 13:57:15 +0100, PeterC

A negative point against the idea would be having to repaint all the Zebra crossings.
G.Harman
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On Thu, 28 May 2009 17:07:44 +0100, snipped-for-privacy@yahoo.co.uk wrote:

yeah - white and black.
--
Peter.
You don't understand Newton's Third Law of Motion?
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--
> >>>> Guy Dawson =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0I.T. Manager =A0 =
=A0 =A0 =A0 =A0 =A0 =A0Crossflight Ltd
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Stuart Noble wrote:

HTF are you going to keep that clean? :-)
--
Dave - The Medway Handyman
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The Medway Handyman wrote:

Pressure washer with a *long* hose powered by a solar panel pointed at all the white roof tops. ;-)
--
Cheers,

John.

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John Rumm wrote:

Long hose no probs, how big a panel we gonna need for a 2.9kW induction motor?
--
Dave - The Medway Handyman
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The Medway Handyman wrote:

The size of a small village ought to do it! (or one could sue John Prescott as a "pair'a'bollock" reflector)
--
Cheers,

John.

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Guy Dawson wrote:

I want to paint all my trees white. Is this what god invented birdshit for?
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On Thu, 28 May 2009 09:33:59 +0100, The Natural Philosopher wrote:

Hmm, so I'm already doing my bit by having so many silver birch?
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Guy Dawson wrote:

Whitewash is traditional. Its basically chalk in glue, and gradually washes off in winter. If you want it to last longer then diluted lime putty, but it needs 2 or 3 coats. In principle you could use masonry paint, but then you'd have to actually get up there and make sure there was no splash or overpaint. The lime paints thats not a problem with, any spill is just hosed off, and a floor brush can be used for painting.
NT
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Guy Dawson wrote:

Well, you could try googling for "roof tile paint"
e.g. http://www.nwepaints.co.uk/acatalog/RoofingBitumenCoatings.html
or even "solar reflective paint"
e.g. http://www.paco-systems.co.uk/pdfs/solarref.pdf
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// ICBM - 6.15.16W 57.12.23N 986M

I'm always wary of solar reflective paints which are a grey.
For good reflectivity, they ought to at least start out white.
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