[jay foden]

anyone recommend the best weedkiller  to stop moss and grass and weeds growings in block paving??    just as a change from sealing??   i was told too apply  it straight after cleaning ( before sanding) by someone which is fine but what about the fresh sand in the joints??  its prone to getting allsorts growing in it? 

[drivewasher]

Jay,
Nothing can grow in kiln dried sand it's sterile. Thats the reason block paving is supposed to be re sanded a couple of times a year with freash dry sand.
The elements errode the sand off the drive over weeks to leave a gap in top 1/8 inch this gap in the joint fills with atmospheric dust (soil) and weed seeds and mould spores germinate in it

[jay foden]

well i thought that but moss seems to grow in it easy.

[trevor perry]

a firm called swiss seal sells a weedkiller that stops weeds for 3 years probably worth a try.

[jay foden]

yes i have seen it but a bit pricey, the customers wont fork out. 

[jay foden]

is all kiln dried sand as good as each other? or are some better? is all kiln dried sand sterilised sand? if not where do i get sterilised sand from. i use kiln dried sand from b & Q at the moment for around £2.70 a bag.? is this not good enough.  thanks.

[drivewasher]

Yes its as good as any
Travis perkins rip us off at around £5 bag

[Ian Rochester]

We always spray newly cleaned block paving with Roundup, leave it to dry out, then sand it

[Roger Oakley]

Jay,
Why not offer clients a mainternance plan, go back every say 2-3 months and re-spray with a good weedkiller IE round-up or simular.
Or up sell the sealing.