[Plankton]

What's your preference for cleaning slate roof tiles? light moss with lichen and algae here and there.
Pressure washer with turbo nozzle!
Pressure washer with 12" fsc
Hypo then brush and rinse
DDAC
Or other

[Splash & dash]

We have recently done two cottages with natural slate roofs with algy growth very green and lichens growing on them some moss but not heavy growth ,sprayed with hypo mix let it dwell for 40 muinets then light rub with hot wfp came up like new customers were delighted , typically I forgot to take photos , must say that the hypo did turn some bits of metal deposits in the slate brown but over a few weeks it had gone a more natural colour , was thinking of treating the spots with that Benz stuff to restore it but customers were happy with the results

[Plankton]

Cleaning slate today and no joy with the hypo, roof is actually covered in lichen so it's not going to shift. I'm not keen on using the small fsc on this job and I never quoted to pressure clean it, so relying on the anti fungal wash to take care of it.

[M Roberts]

Cleaning slate today and no joy with the hypo, roof is actually covered in lichen so it's not going to shift. I'm not keen on using the small fsc on this job and I never quoted to pressure clean it, so relying on the anti fungal wash to take care of it.

It will take care of it but may have to wait 6-12 mths 

[Kev Martin]

Cleaning slate today and no joy with the hypo, roof is actually covered in lichen so it's not going to shift. I'm not keen on using the small fsc on this job and I never quoted to pressure clean it, so relying on the anti fungal wash to take care of it.

It will take care of it but may have to wait 6-12 mths 

That’s not true, our spray and walk away works a lot quicker than that Mike

[M Roberts]

Cleaning slate today and no joy with the hypo, roof is actually covered in lichen so it's not going to shift. I'm not keen on using the small fsc on this job and I never quoted to pressure clean it, so relying on the anti fungal wash to take care of it.

It will take care of it but may have to wait 6-12 mths 

That’s not true, our spray and walk away works a lot quicker than that Mike

Yes it is true depending on the wash you use


Taken from Algoclear pro - 'The speed of cleansing is by and large in relation to the site exposure. It varies typically
between 9 to 12 months on grainy substrates. Some coin size lichen take over a year to drop. In the meantime as the
cleansing progresses the original colour of the roof material reappears.'   

Just a note look what they have stated back to original colour, which is nonsense it will be what ever colour is left after years of erosion .

Currently temps are just above freezing its not going to be above 5 deg until Sunday with rain forecast, if your product works at these low temps with these conditions can you send me a sample to test 

[Smudger]

you need to go HOT!

Darran

[Plankton]

Fecking hypo was freezing up after it ran onto the flat roof. No wonder my hands were cold and needed heating up on the pw exhaust.
The antifungal wash looses it's effectiveness below 4c so feck knows when I'll get it on.
Pressure washing will sort it out but it's something I want to avoid on this old roof.

[Aqua Power Solutions]

Low pressure and heat will sort this out
Also at this time of year the surface temperature will be too cold for hypo to have an immediate effect
Ed

[Plankton]

Cleaning part of the building today and noticed "a Gaffer" having a scout about the rear section of roof I've to clean... Nothing was mentioned to me but after a couple of workers had been up later I asked what was going on. Turns out there's a leak!
So I ask the gaffer if it's OK for me to continue my work on that area and he says it's just a small drip. (I had done half of it yesterday)
The overly cautious approach that I have can sometimes pay off, imagine I had blasted it with the pw instead and as someone has moved into that part of the building I would most likely be on the receiving end of a bill.

[M Roberts]

Cleaning part of the building today and noticed "a Gaffer" having a scout about the rear section of roof I've to clean... Nothing was mentioned to me but after a couple of workers had been up later I asked what was going on. Turns out there's a leak!
So I ask the gaffer if it's OK for me to continue my work on that area and he says it's just a small drip. (I had done half of it yesterday)
The overly cautious approach that I have can sometimes pay off, imagine I had blasted it with the pw instead and as someone has moved into that part of the building I would most likely be on the receiving end of a bill.

did you inspect loft prior to clean ?

[Smudger]

if cleaning the correct way i.e... from the ridge down even with pressure washing you wouldn't get a leak unless the tiles are broken or missing  - when you applied the 'soft wash' where were you standing ? and did you fire the water up the roof ??

Darran

[Plankton]

There's no loft or attic space as it's a conversion. Roofer's going tomorrow to sort some tiles but the lady came out after I had rinsed down a gable end which sits above her flat roof and water had entered via the extractor fan. Turns out the roofer was asked by a worker to do tighten a fitting and wouldn't so it got left!
Just got the anti fungal to go on but the leak was described as "pouring in" from the occupier to just a drip from the gaffer which need a wipe with a cloth.
Don't know why they have moved in with all the work still being carried out and apparently there not happy with a few things. (wouldn't be fair to repeat the description I heard)