Are there tiny weeds growing in the cracks? Moss? Nasty black lines where the joins go?
All these are signs that you need to do a bit of maintenance now, before things get out of control.
Why? Because even the best quality block paving is usually only laid on a hardcore and sand base, they are not cemented into place - the reason being that the individual blocks need to be able to move very slightly as cars drive over them, otherwise they would crack: and it also allows drainage of surface water. The edges may well be cemented in place, to stop them drifting apart - but not the main area.
You might think that a bit of mud or moss on the drive is not a problem, or that you don't really mind the odd weed or two: but the problem is that weeds tend to get bigger and bigger until the point where they start to force the blocks apart, leading to all sorts of problems. Also, any plant growth between the blocks will catch any wind-blown debris such as litter, or leaves, instead of letting them blow clean across and away. This material then rots down, creating more organic matter to feed the weeds.
Even a layer of moss along each join will catch water like a sponge, creating a nice planting environment for weeds.
So, what to do? Get yourself a long-handled wire brush, the sort that is sold for cleaning patios and drives. You can do this on your hands and knees, using a daisy grubber or an old kitchen knife, but a long-handled brush really saves the back...
Wait until we've had a few dry days, then start at one corner, facing outwards, and use a to-and-fro scrubbing motion along the join. Annoyingly, most of the best block paved drives are laid in a herringbone pattern, so each join is no more than one and a half blocks long.. so you don't get a chance to build up a good rhythm. Ah well, such is life. Scrub along the join. Take a small step to the left or right - scrub the next join. Take a small step... scrub the next join.. continue until you reach the end.
Change the brush to the other hand, take a half-step backwards, and scrub the join at right angles to the last one you did. Take a small step to the left. Scrub the join....
Continue doing this until you are demented with boredom and can't take it any longer. Put down the scrubbing brush, go and get a normal yard broom or household (outdoor) broom, and sweep up all the loose bits. Then go back and scrub another section.
The reason for starting in a corner and looking outwards is so that you are not treading on all the loose bits, by they way: there's no point scrubbing them off, just to tread them all in again!
Here's one I did this week: the top (right-hand) half has been scrubbed but not swept, and I swept a small strip to make the difference more obvious: can you see where I've been?!
This was quite a large drive, so I did it in instalments over a couple of weeks.
When I'd finally finished, the result was spectacular, it looks just like new!
Having de-mossed and de-weeded it, the final job is to spray it with a residual type of weedkiller (Pathclear is the usual brand name, or something clearly marked "For paths and patios") to help prevent seeds from germinating and starting the cycle all over again.
So there you have it - how to keep your beautiful block paving drive looking like new: once a year, scrub it and sweep it!
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