Concrete tiled roof renovation

[ian_uk1975]

Getting my 1970s house rendered and cedar cladded for that contemporary look. When it's done, the house should look transformed, except the roof which is covered in moss, lichen and algae...



I've considered having the roof jet washed and treated, but research suggests this is a bad idea?

I don't want the expense of retiling the roof as the existing tiles are fine, just unsightly. Once the rest of the house has been spruced-up and looking like new, the roof will stand-out like a sore thumb.

Is there any acceptable way of refurbishing the existing tiles to remove the years of built-up dirt and fungus short of replacing the tiles? The house is a very large 4-bed detached with a detached double garage, so I would guess retiling the whole lot would be thousands (£5k-£10k?)

[toohuge]

A strong acid will literally disintegrate all of the grim and moss etc.... however I would be hesitant to do this as the moss / other crude may be keeping your roof from leaking!

We use acid a lot to clean concrete on driveways / around pools etc and it works very well.

[Laurel Green]

I'd be hesitant to jet-wash the tiles for fear of water playing havoc with the HI-FI.

[AW10]

Be careful with pressure washing concrete tiles; the tiles are probably coloured only on the outside and the pressure washing may remove some of the colour leaving some grey patches showing.

[allnighter]

OP! You do realise that "Home Cinema & Hi-Fi" has nothing to do with Home renovation, building, asbestos, concrete tiled roofs, jet-washing them, painting walls etc... I mean you would not pop in to your local Currys to buy a bag of cement would you?

[wolfracesonic]

^ +1 there is no comma between 'Home' and 'Cinema'. I wouldn't take acid anywhere near the tiles BTW, it will kill the moss but also attack the tiles. Try something like this Fungicidal wash leave it to dwell, then pressure wash, in downward direction with the nozzle on a fan setting