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    Looking for advice with cement burns

    Gloves. If you get cement on your skin wash it off quickly. Unfortunately cement, when added to water, generates calcium and sodium hydroxide in solution making the pH very high (around 11). At this pH it degrades skin effectively dissolving it. However as the nerve cells dont tend to respond...
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    Slurry mix - ONLY WORKABLE FOR 3 HOURS?

    It says workable for 3 hours so will probably keep til the next day but only if you start mixing it at about 10pm.
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    Porcelain Is Mortar depth CRITICAL????

    No as long as you ensure a full bed and back butter the tiles. Bear in mind though that type 1 is cheaper than mortar so might be cheaper to compact more bedding.
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    Porcelain laid on sand and cement?

    Can't see the need for uncoupling outside. In fact in many cases it would seem counterproductive. Can't see a reason why this should fail anymore than any other install. Looks nice too. Might get a bit slippy though.
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    Amtico - but can we wait 5 months for floor to dry?

    There are lots of options depending on the screed type. Liquid DPMs, fast track moisture suppressants, uncoupling membranes, force dry techniques so it really depends on the screed type as to what you can do.
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    Tile moving and grout breaking

    Hmm… best not get into a debate about anhydrite…
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    Tile moving and grout breaking

    I missed that it hadn’t been primed. That won’t help either depending on the adhesive used of course… (I might have missed that as well)
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    Tile moving and grout breaking

    Your use of the room stat to control the temperature is an in appropriate way to do it. The flow temperature of the water within the screed is the important bit. That can only be controlled at the mixing valve or the boiler. That is why you cannot really control it as finely as 1C per day. Using...
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    Tile moving and grout breaking

    It is not possible on most ufh systems to increase the temperature by 1C. I’m interested to know how you achieved this?
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    White marks on limestone tiles

    I'd say it is efflorescence?
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    Tiles not bonded to floor properly

    No it sounds extraordinarily incorrect. The floor should be dry to below 75% to be suitable for covering. 97% is far too damp
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    Tiles not bonded to floor properly

    97% dry?? What does this mean?
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    Porcelain Tiling To Calcium Sulfate Based Screeds (Revised Dec 2011)

    Simple str sander hire from speedy hire or hss or any decent hire shop. Grinding is too aggressive really. Sand it, vac it
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    Porcelain Tiling To Calcium Sulfate Based Screeds (Revised Dec 2011)

    If your screed is going to crack it will do so when you first run the heating. Do you want the tiles to be in place of this happens. How do you know it to be dry…. You don’t. Floors do funny things especially when fluctuations in temperature occur. You can get cold spots and dew points...
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    Porcelain Tiling To Calcium Sulfate Based Screeds (Revised Dec 2011)

    The rules for underfloor heating are the same for all screeds. It should be cokussiobed and run. If you don’t you run the risk of thermal expansion cracking the screed and the tiles. You say it’s had 3 years to dry… it’s also had 3 years to get wet again. The heating should run through its...
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    Porcelain Tiling To Calcium Sulfate Based Screeds (Revised Dec 2011)

    These are general tiling questions and not to do with calcium sulphate. The UFH must be comissioned and run before tiling. The screed needs to be clean and free from loose friable material and needs to be absorbent. This means lightly abrading with a sander and vacuuming. 600x600 will need to...
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    Porcelain Tiling To Calcium Sulfate Based Screeds (Revised Dec 2011)

    I helped write it so what do you need to know
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    Possible to turn underfloor heating on low while tiling due to cold?

    it is possible but fraught with potenital for danger. Adhesives are designed towork generally in optimal conditions typically at 20C so if the floor is consistently at 20C then you owuld be fine. Trouble is the underfloor heating will cycle based on room emperature unless you over ride the room...
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    Underfloor heating screed with Grano

    Quick answer is no. You need anti shrink admixtures/additives or it'll shrink and fall apart. At 15mm depth you are looking at specialised materials with high plasticity and shrinkage resistance. You could look at something like Gypsol TS-15 screed (shameless sales plug)
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    Self levelling compound on top of 100mm insulation

    Why levelling compound in top of insulation. That's bonkers! If the concern is that it our if level. Put the levelling compound in the concrete underneath...

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