Posted: 07/06/2015 at 07:44
You will need to weed the bark chippings occasionally - nothing can stop wind-blown seeds coming in and taking root - just an occasional hand-weed or going around with a hoe should do the trick - but you won't get rid of that job completely, no matter how thick you mulch or whatever you mulch with.
I suspect that rubber 'bark chippings' have been invented and made with the interests of the tyre manufacturers to the fore, and not those of gardeners. If they can find ways to 'recycle' petrochemical products (which is what tyres are) it's cheaper for them. Nothing to do with them being 'fit for purpose' as a mulch