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#16
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#18
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Chris French and Helen Johnson wrote:
A standard bricklaying mortar is builders sand and cement. For wide joints in paving, as the OP is using, then I would use a mix of sharp sand (called grit sand in some areas) I disagree - a sharp sand mortar has a coarse visual texture and a variety of colour from the large mixed grains that fight with the texture of the paving slab (beit stone, reconstituted tone or simple concrete) I would ALWAYS us a soft sand and cement mortar for pointing paving. A simple technique I have used in my garden several times is to water the joints well, leave for an hour till the top surface is dry and then brush in ready mixed dry sand cement mortar (kiln dried sand and cement in bags from B&Q: Note the ready dry mix type, not that with a separate bag of cement with semi damp sand) carefully brush all excess off the top surface using a small hand brush and hey presto the residual moisture is drawn up into the dry sand/cement mix and you have a nice neat recessed mortar joint. Tommy of Ground force uses the same technique. Not a technique to use on prestige jobs where the pointing finish is a design element in itself, but more than ok in most general situations - and takes a small fraction of the time wet pointing takes and is far less messy. Good up to a 10mm joint, more and I would suggest a semi dry hand pointing mix pk |
#19
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p.k. wrote:
:: Chris French and Helen Johnson wrote: ::: A standard bricklaying mortar is builders sand and cement. For wide ::: joints in paving, as the OP is using, then I would use a mix of sharp ::: sand (called grit sand in some areas) :: :: I disagree - a sharp sand mortar has a coarse visual texture and a :: variety of colour from the large mixed grains that fight with the :: texture of the paving slab (beit stone, reconstituted tone or simple :: concrete) I would ALWAYS us a soft sand and cement mortar for pointing :: paving. :: I agree. :: A simple technique I have used in my garden several times is to water the :: joints well, leave for an hour till the top surface is dry and then :: brush in ready mixed dry sand cement mortar (kiln dried sand and cement :: in bags from B&Q: Note the ready dry mix type, not that with a separate :: bag of cement with semi damp sand) carefully brush all excess off the :: top surface using a small hand brush and hey presto the residual :: moisture is drawn up into the dry sand/cement mix and you have a nice :: neat recessed mortar joint. Tommy of Ground force uses the same :: technique. :: I think the most telling words in this paragraph are, 'several times'...brush pointing like this is IMV a waste of time, sand and cement. mortar needs to be compressed, I have used this method a few times and it's never lasted more than a few weeks, *unless* you go over it with a jointing tool or trowel and force the mixture down, then sprinkle and brush again to get the rest of the joint filled and trowel down again. to try this yourself, mix a handfull of sand and cement dry and leave it in a bucket - you can crumble it up a fortnight later with your bare hands :: Not a technique to use on prestige jobs where the pointing finish is a :: design element in itself, but more than ok in most general situations - :: and takes a small fraction of the time wet pointing takes and is far :: less messy. Good up to a 10mm joint, more and I would suggest a semi dry :: hand pointing mix It's good up to a 20mm joint if it's done in two or three stages, even this takes a fraction of the time of doing it all 'manually'...to fill a 50mm (deep) X 20 mm (wide) gap takes quite a lot of sand / cement, next time you do it, fill it to the top and then go all over with a thin metal tube or brickies jointer, this will give you another 20mm to fill, once brushed over a second time, this will again drop down with the jointer, about 5 - 10mm but it will be solid all the way down. -- If God had intended us to drink beer, He would have given us stomachs. |
#20
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Phil L wrote:
I think the most telling words in this paragraph are, 'several times'...brush pointing like this is IMV a waste of time, sand and cement. mortar needs to be compressed, I have used this method a few times and it's never lasted more than a few weeks, *unless* you go over it with a jointing tool or trowel and force the mixture down, then sprinkle and brush again to get the rest of the joint filled and trowel down again. I was not clear: Several times, in different locations - the oldest is now 10 years plus, completely sound and regularly pressure washed to try this yourself, mix a handfull of sand and cement dry and leave it in a bucket - you can crumble it up a fortnight later with your bare hands Because the sand is not *dry* and does not flow & compact. The key to the method is to use *kiln dried ready mix* that flows into the cracks and crevices packing just as well (possibly even better than) a semi dry mix well trowelled down. A normal builders sand and cement mixed by hand will not work and will behave as you describe. ( NB I am not talking about block paving kiln dried but the bags of dry ready mix) I does work! pk |
#21
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Phil,
I had already seen this picture http://www.marshalls.co.uk/transform...ry_paving1.jpg in the Marshalls catalogue/website and thought it looked very good but assumed the 'white' colour was achieved using white cement or some sort of dye. I find it difficult to believe that I would get that colour using red building sand and OPC (Ordinary Portland Cement ?). I tried a little 'test' pointing last night using some broken/waste bits of paving and some buff dye , however this morning it still looks like ordinary grey mortar but I think it takes a few days to cure before the dye comes through. I used the www.pavingexpert.com as a guide and tried to do a semi dry mix where you add as little water as possible to get the mortar pliable but not wet enough to stain the paving. You then scatter it over the joint and press it down using a trowel. It seems very difficult to know exactly how dry to keep it though. I thought it was too dry but it still seemed to stain the paving (so I cheated and wiped it off with a slightly damp cloth before striking it with a pointing trowel). I think I'm beginning to be convinced to go with the natural sand/cement mixture, I'll give it a test tonight and see what it looks like after a few days. Has anybody tried using white cement which should mean the pointing ends up the colour of the sand which would be close to the colour of the paving? |
#22
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wrote in message oups.com... I'm in the process of laying a new patio and myself and my partner can't agree on what colour pointing to use. The paving is Marshalls Chancery paving in Honeydew colour which is a buff/blonde/yellowish colour. The design of the paving edges neccessitates a 1-2cm gap between each slab. I think we should go with a dyed dark colour to contrast with the paving but she thinks we should use a buff colour similar to the colour of the paving or use a natural grey mortar colour. Any suggestions? IMHE the dyed pointing eventually fade with time so can become rather a waste of money I would just use bog standard mortar |
#23
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In article ,
p.k. wrote: The key to the method is to use *kiln dried ready mix* that flows into the cracks and crevices packing just as well (possibly even better than) a semi dry mix well trowelled down. A normal builders sand and cement mixed by hand will not work and will behave as you describe. ( NB I am not talking about block paving kiln dried but the bags of dry ready mix) I does work! Totally unnecessary - but I agree about the normal mixtures not working. Unless you collect from the kiln, the sand will have reached ambient humidity by the time you buy it - those bags are NOT airtight. You can trivially make it yourself, in the drier parts of the country and in summer almost everywhere, by simply drying appropriate sand. Builder's sand will produce a normal mortar. If you sieve sharp sand though a kitchen sieve, you will get a fine sand that makes a very porous mix and does not typically set hard. I use that, both because it lets water through and because it is easy to remove if you need access or to relay. You must sieve the sand when it is really dry, and it is the right texture for using for mere sand filling of slab or block joints. You can also get there from builder's sand by washing it - but you end up rejecting most of it. Regards, Nick Maclaren. |
#24
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In message . com,
writes Phil, I had already seen this picture http://www.marshalls.co.uk/transform...ry_paving1.jpg in the Marshalls catalogue/website and thought it looked very good but assumed the 'white' colour was achieved using white cement or some sort of dye. I reckon they probably paint the joints whatever colour they think looks best for the photos..... Much easier than trying to get mortar the 'right' colour -- Chris French |
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