Chip & spray ( handlay)

[loudog]

Hi to all, ive been asked to chip and spray a drive, The drive is just two tracks of concrete about 12mts long each. Is it as easy as to put some tack coat down (60%) i am guessing and lay 10mm chips on top, any advise would be great.
Cheers Chaps

[msh paving]

im not a mackytar expert but tack coat won't stick them ,you need hot tar for them to stick into MSH

[bobbi o]

Colas Leochip and 10mm clean. not for this time of the year-wait till spring.

[Tony McC]

Usually a hot bitumen emulsion used at this time of year. Definitely NOT tack-coat.

I'd pass on this one to a full-time tar'n'chip specialist. It's a messy, messy job that needs specialist kit and plenty of experience.

It's more than a decade since I last looked at a tar'n'chip job, but back then it had to be 150m² or more to be economic, otherwise it was cheaper to do a 20mm overlay.

[loudog]

Thanks for your feedback. Could i use a hot bitchy pot like roofers use, i have plenty of bitumen blocks so couldn't i just heat them up, pour on with can and put chippings on the top, the tracks are about 12 metres long by half metre wide, i coud just do a little at a time so the bitumen doesn't go off, what do you think.
regards

[Tony McC]

Nope - wrong sort of bitumen.

[loudog]

The reason the client wants chip and spray is because it is on a steep slope, and he has it in his head that would be best as his road is done out in it, any other idears i can tell him.

[Tony McC]

Before Simeon jumps in ...resin based surfacing would seem to be the answer

[Dave_L]

Before Simeon jumps in ...resin based surfacing would seem to be the answer

But at a considerable price premium compared to surface dressing!

[Tony McC]

Resin would be significantly more expensive on a larger job, but anything under, say, 50m², there's not much in it. Very, very roughly, 50m² of resin bond would cost around 2 grand. I doubt I'd be able to get a surface dressing gang in for much less than 1500 quid.

[loudog]

Prob will have to go back to the drawing board as this guy doesnt want to spend much, think he has a budget of £500, he doesn't care what it looks like, he just wants a bit of traction on those steep tracks of his

[Tony McC]

Saw cuts and chasing at a alight downhill angle?

[loudog]

Thanks but can you explain a little more on that Tony

[GB_Groundworks]

Add texture to existing concrete by scouring it with a cut off saw and diamond blade.

Use regular intervals and I'd be rigging some kind of jig up to get a consistent depth of cut and use water suppression

[Tony McC]

Sorry - I should have made it clearer.

Make parallel saw cuts approx 25mm apart, and just 6-10mm deep. Allow 100mm or so between each pair of cuts. Direct the cuts so there is a downhill fall.

Then, chisel out (known as 'chasing') the concrete between the parallel cuts. This gives a roughly textured surface that should offer a bit more traction. The reason for ensuring there is a fall should be apparent - you don't want water accumulating in the chased cuts where it will turn to ice.

It's not particularly pretty, but for 500 quid, you're not going to get much else.