Sika Maxmix Waterproofer

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20 Jul 2003
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A few weeks ago I rendered a few internal window reveals with sand and cement and water mixed (in the correct proportions) with this waterproofer. I tipped out what was left in the bucket on to a carrier bag and forgot about it. Yesterday morning, for an experiment, I partially submerged a few pieces of various sizes in a tray of water. Most of the material of these pieces were well above the water level. However, by late afternoon, all of the pieces were completely saturated with water. To my surprise. This can't be right can it? I would expect the top of these pieces to remain perfectly dry. Is waterproofing only achieved by closing in the surface, or is this an ineffectual product?
 
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I suppose when a lump of cement mortar, even with added waterproofer in it, is partially "submerged" in water for a time, then that is a totally different situation to the same mix being spread onto a vertical surface where any rain/ moisture etc can run down the wall, and off. Using a top brand like Sika Maxmix for the purpose intended, i'd say that it, and similar products wouldn't be allowed to be on the market if they didn't work,,,,, that's my take on it anyway,,, anyone else got a view?
 
My thoughts exactly roughcaster! Water runs off the wall in beads in a rendered wall which has waterproofer added in the mix..without it absorbs into the render.
 
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Thanks gents. I remain unconvinced. I carried out a similar bag of a fag packet experiment some years ago with an SBR based mix of S/C and I'm pretty sure that didn't allow any water to rise above the water level by absorption. This latest mix would appear to be water resistant rather than waterproof. But not that resistant.
 

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