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Posted: Thu Oct 11, 2007 9:00 pm
by bobbi o
its a bitumen based emulsion used to make the new layer of tarmac stick to the old.
we tried a concrete acid cleaner today-no joy. my man is back on the job with hot water,ariel soap powder and a scouring pad.his idea not mine,will let you know.
Posted: Thu Oct 11, 2007 11:34 pm
by Dave_L
Petrol will shift it bobbi, nothing else will touch it.
I fear the worst though, that is one hell of a spill.
Posted: Fri Oct 12, 2007 12:16 am
by lutonlagerlout
only 2 words for that bobbi
cat malogan
i know me and a mate some years ago had an idea for covering up dirty tarmac drives with a bitumen paint,which worked well till the weather improved 
we tried everything and nothing really worked ,in the end we used newspaper and elbow grease,just kept rubbing the newspaper back and forward in an abrasive sort of way .took us ages
good luck
LLL
Posted: Fri Oct 12, 2007 1:27 pm
by IanO
A couple of years ago I tried to clean old masonary paint off my wall. Tried everything including scraping, abrasives, paint-remover, etc.
In the end, I bought a sand-blasting attachment for my small Karcher (it is the smallest / least powerful model). It works by having a pipe running off into a bag of jointing sand (it has to be - and remain - completely dry). The water pressure is then mixed with the sand - sucked into the nozzle - and provides a pretty effective grit blast.
Apart from the fuss of keeping the pipe in the bag of sand (on a scaffold tower!) it worked a treat and I have used it since for other cleaning jobs.
I think the attachment was about £50 - for me, money well spent - perhaps this would work here?
Regards
Ian.
Posted: Fri Oct 12, 2007 3:45 pm
by TarmacLady
Try some white spirit -- it's about the only thing that will cut dried asphalt. As above, though, be ready to mop it up, as it won't remove it, but will loosen it a bit.
Alternately, look at the auto supply for something that will lift oil spots off the drive -- it's got chemicals that will break it down and lift it.
Posted: Sun Oct 14, 2007 5:37 pm
by Tony McC
Back to LLL's query about the DPC on my driveway, the paving is about 120mm below DPC, but I'm ties to the gully level on that right hand corner. That is set bang on 150mm down, and even with a new gully fitted we couldn't drop it any further because of the incredibly shallow level of the SW drainage on this property.
I put just 30mm of crossfall on the paving from the front door (extreme left) to the gully, giving me a fall of 1:130, but there is an endfall of around 1:65, so no ponding problems.
Where the drive goes down the side of the house, the drains are so shallow the drive has had to be lifted to 0mm below DPC and I've used a dry area channel to protect my property.
Posted: Sun Oct 14, 2007 7:38 pm
by lutonlagerlout
i was just pulling your leg T, BC in luton let us go 75 mm below dpc if there are linear drains around the wall and if the site dictates it
LLL 