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Posted: Mon Feb 16, 2004 3:43 pm
by mikeal
I am installing 24"X24" concrete tiles for a back patio and may be using polymeric sand for jointing ONLY if it can handle a lite pressure washing.
Any help would be great!
Thnx
Mikeal_s
Posted: Tue Feb 17, 2004 7:33 am
by 84-1093879891
It depends on joint width - the wider the joint, the less likely is a polymeric sand to withstand a high-pressure jet.
Because most polymeric sands (certainly the case with Geo-Fix, which is the most readily acvailable product in the UK) don't bond to the sides of the joint, but bond only to other polymeric grains, there is not a lot of resistance to scour and jet washes.
Personally, I wouldn't use polymeric sand in any joints wider than 3mm, if there was a requirement to regularly wash them down with a pressure hose. However, there are some compounds, such as WJC from Resiblock and Keybond from Marshalls, that can effect a bond between the polymeric sand and the joint sides, which should, in theory at least, improve the bond and increase resistance to scour/jetting.
Posted: Wed Feb 25, 2004 8:35 pm
by Alan Surrey
I used geo-fix on my patio 2 years ago. I use a jet-wash about 3 times a year. Every time I wash it, a bit more pointing erodes. You can now see the marks the jet-wash has left in the pointing joints. I will probably re-point it this summer, using a proper pointing mix at a fraction of the cost!