just jet wash it every couple years, if the water has no where to go you will get moss or algae
 
but be careful with the pressure washer. too much can wash sand from under the slabs and make them wobbly.
 
good some paving diy done in my garden, used pavement slabs from sidewalk down the road when they got resurfaced with asphalt.
picked up a van load for free, road work guys were happy we saved them loading the lot into the skip.
i brush it with a bucket of water and a broom every now and then and thats it.
 
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By concrete pressed type, do you mean pattern imprinted concrete? If so you obviously don't have to worry about washing sand away when pressure washing it as there isn't any. Have a look at the paving expert website/book, by Tony McCormack he knows his stuff.

Paving Expert - Sealants for Paving
 
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i'm thinking of the 2" of sand under the slabs. different if the slabs are cemented in place.
 
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ring DNO. they'll come and seal it for you. :19:
 
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Don't bother jet washing or sealing.

Every few years you can "wash" them by spraying them with red label hypochlorite, brings them back to new.
 
will this not kill my grass?

I don't know but i'll find out. You would only spray it on with a watering can and then scour it with a yard brush. Farmers use it to wash out dairy parlours. We use it around our house (but we have kerbs) instead of power washing because it washes out the sand from flags and pavers etc
 
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Yes it can kill the grass.

But if you put in on with a weed sprayer on a dry day and just put enough on to wet the patio and let it dry in then it wont damage the grass. It will eat away at the moss over a day or so and clean up the path with no damage. Don't be having the place like a river.
 
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To seal or not to seal paving
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Barry White,
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rapparee,
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