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Posted: Tue May 29, 2007 8:01 am
by nelly05
Cheers for looking,
I got some mot put down in the back garden and unfortunately due to one thing and another half the garden didnt get wackered.
With all the rain etc the top level looks just like washed stone.
Do i need to dig it all over to mix the smaller stuff again, is there anything i can add to the top or can i lay another layer of MOT1 over the top. I need some extra in a small area but would it be best to order in a tonne and spread over and re level. The area is about 35m2.
TIA
Regards
Posted: Tue May 29, 2007 12:02 pm
by ski
I would think about spreading wynn dust on the top (when dry), spreading just a few mms, wack it, then spread another few mms. As for digging the whole lot up it would depend on what the mot was going under etc, a little more info may help.
Posted: Tue May 29, 2007 1:31 pm
by nelly05
Cheers for the reply.
The mot is to level up on top of some soil, prior to an indian stone patio being laid, on a full mortar bed.
The patio is foot traffic only, but dont want to lay the mot and then not sort it properly - be a daft waste of time.
Never heard of Wynn dust, and cant find any info on it, how is it supplied, and is there any suppliers in the north west pls
Regards
Posted: Tue May 29, 2007 2:08 pm
by ski
Wynn dust is wynn stone dust, like the fines in type 1, we use it on top of crusher run to seal a farm road or such and its fairly effective. You should be able to find a suitable alternative in your area and I suspect you wont need much. If its only a patio you could put another 50mm of type 1 on top and wack that, provided you can cope with the increased height.
Posted: Tue May 29, 2007 2:48 pm
by nelly05
I think i prefer the dust soloution TBH. If you move the top layer of stone immediately underneath is ok, i just want it to knit the top layer together and prevent all my mortar running away.
Wheres the best place too look - quarries or Builders merchants.
Regards
Posted: Tue May 29, 2007 3:26 pm
by andpartington
would sharp sand have the same effect as the dust i know i have used sand to bulk up the fines in mot and it worked OK 
andy
Posted: Tue May 29, 2007 3:32 pm
by nelly05
@ andy
I had wondered about the grit sand as i saw something on the net, just thought id ask here first. Wasnt sure if it would just compact on tiop rather than work its way through.
We are not having the dryest of weather to do this either, so was hoping it would be a case of cover an area a couple of m2, whack it then get on to the next area.
Regards
Posted: Tue May 29, 2007 7:27 pm
by Stuarty
I think you mean Whindust / Whinstone 
Posted: Sun Jun 03, 2007 10:28 am
by nelly05
Cheers guys.
Was wacking the type 1 tpoday and with it being so dry it was very dusty.
Am i ok to spray some water over it to aid the bonding, and reduce the dust
Regards
Posted: Sun Jun 03, 2007 1:39 pm
by Dave_L
Yes, no problem.
Posted: Mon Jun 11, 2007 6:20 pm
by Tony McC
Ski's "Wynn" is, as Stuarty mentioned, actually "Whin Dust", a sandy grit (or gritty sand) that is a by-product of whinstone quarrying. However, whinstone is more or less unique to NE England and parts of Scotland. It's not found south of, say, Harrogate.
The British Isles are geologically diverse, and there are many aggregates that are specific to particular regions. Just as Whin is archetypical of NE England, Hoggin is restricted (thankfully) to SE England, and Pennant Stone is most commonly used in S.Wales and SW England, while blue limestone or Killaloe slate is unmistakeably Irish.
That's why the industry generally prefers to talk about classes of aggregates, such as Type 1 sub-base or Table D2 sand, as these refer to the required properties rather than the geological source of any given material. A Type 1 granular sub-base can be diorite in Scotland, gritstone in Lancashire, limestone in N.wales, granite in Cornwall or crushed concrete in London. It will (should!) perform the same wherever it is used, even though the type of material is mineralogically different.