On 4 Mar, 10:38, NT wrote:
On Mar 4, 12:59 am, Bill wrote:



In message , The Medway
Handyman writes

One of the worst things you can do with an asbestos roof is to
pressure wash it. Now that really does loosen the fibres up!

With respect - bollox!

http://www.aic.org.uk/asbestos_cement.htm

Cleaning Asbestos Cement Roofs.

This should only be carried out if it can not be avoided, moss and
lichens although some may think them unsightly are not normally
detrimental. Asbestos cement is very fragile and so the recommendations
in HSG 33 Health and safety in roof work (1998) must be followed.

Do not clean by dry scrapping or by pressure washing, both can produce
dangerous quantities of free asbestos fibres. Either:

* Use remote cleaning. This technique involves skilled operatives
using units with enclosed rotary cleaning heads and high-pressure water
jets, the filtering of the water run off and the disposal of the filter
waste as asbestos waste. It should only be carried out by skilled
specialist contractors.
* Cleaning with surface biocides. The biocides are applied with
low-pressure sprays or as washes. The roof is then left for the moss and
lichen to die, when it can be gently brushed from the roof with soft
brushes. It is important that the roof is kept wet during the brushing
and the waste is carefully collected placed in plastic bags and disposed
of as asbestos waste.

How credible is that? The claim that moss from an asbestos cement
roof, which remains undamaged by moss growth, must be treated like
asbestos for disposal.

Not only that but they want asbestos disposal companies to do your
roof cleaning! I think we can see where that site's coming from.

NT

£1 a minute "advice" line that's where from :)

" Director General A M Hutchinson FIoR"

WTF is "FIoR" anyone?

JimK