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gypsum

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4Ā·2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall. A massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England. Gypsum also crystallizes as translucent crystals of selenite. It forms as an evaporite mineral and as a hydration product of anhydrite.
The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison.

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  1. A

    My 1st Job Replace damagedGypsum plasterboard with aquapanel in shower enclosure?

    Hello, this is my first post on here, probably one of many I am sure! I am looking for some advice on an issue we are facing with our shower enclosures tiling in a circa 1890s mid terrace house. We recently moved into a house that had recently been refurbished, and fitted with freestanding...
  2. E

    Anhydrite+Ditra+Porcelain - Mapei Primer or not / Keraquick with or without Latex Plus

    Hello Everyone! First time writing here. šŸ˜…Contemplating the horrendous prospect of installing underfloor heating in a fully inhabited house with furniture and belongings now in the garden I have read a ton of posts on this forum and youā€™ve been a marvellous help. So, a zillion thanks ahead of...
  3. R

    How to prime sand and cement rendered walls with the top coat of gypsum plaster removed?

    Afternoon everyone, just after a bit of advice on preparing some walls for ceramic, possibly porcelain (havenā€™t decided yet) wall tiles. Okay so a bit of background information first of all, the gypsum finish plaster on all the walls in my new house is quite poorly adhered in most places, it...
  4. H

    Tilemaster Tilemaster AnhyFix Gypsum-Based Adhesive 20KG Bags For Sale

    10 x 20kg bags of Anhyfix (gypsum adhesive) Ā£100. Available near Portsmouth next week. Pm me if interested. Cheers
  5. F

    Aus Gypsum based poured floor advice

    Hi all new to the forum Advice needed on poured gypsum based floor. First one I've come up against and reading up on them a bit daunting. 80m2 and don't want to screw it up . Under floor heating has been commissioned and the floor has Been down for just short of 6months. I've scrapped most of...
  6. B

    BAL BAL and Gypsum based Screeds

    Have a read of this from BAL https://www.linkedin.com/pulse/solving-anhydrite-problem-philip-jenkins/
  7. D

    Gypsum anhydrate pump screed

    Anybody worked with this screed . What is it like for Laitence good , bad , average . Thanks
  8. F

    Anhydrite / gypsum dust

    does anyone know if it contains silica in any volume ?
  9. Dannym80

    Anhydrite laitence removal

    Yes it's that damned gypsum screed! The builder assured me it's been sanded & laitence removed all bar one room. I'm on site today and they've got a guy using an electric hand sander with 80 grit paper. I don't think that's manly enough, how can I tell if the laitence has been taken down...
  10. D

    Gypsum based adhesives

    I as yet have not been brave enough to use a gypsum based adhesive on an anhydrate screed just wondering has anybody on here used them and if so how they have found them and most importantly any failures.
  11. K

    My 1st Job Gypsum backer board, Mapie grout and soundproofing.

    Hello I never did find a local plumber to advise me - so let's see if this works... I'm hearing that Mapier grout is the very best and there seem to be various kinds.... I'm keen to prevent mould in the kitchen and bathroom. Can anyone vouch for it - or will any grout do? I'd really like to...
  12. V

    Preparation Gypsum screed prep

    Hi all In process of tiling gypsum based screed It's one of the newer screeds that apparently don't need sanding ect The screed has been down a while and customer thought he was running the water through the heating system to help dry But ther must of being an airlock or dodgy thermostat because...
  13. S

    Aus Screed

    pricing up a job, customer stated that it's a concrete floor & very flat. I took the kickers off in the kitchen & im more than certain it's a gypsum screed or top coat. What do you guys think? It had been tiled previously 10 years they were down without issue but customer says that they came up...
  14. J

    Any Idea Where To Find A Sanding Machine For Gypsum In London

    Hi again, So following my misfortune in my Gypsum adventures (by the way many thanks for all the comments): Tiles Coming Off Screed Re-tiling Advice I have now to sand my lovely floor (the main contractor having jumpped off the boat with his packs of plaster leaving me with the Tiler). The...
  15. B

    Anhydrate floor, best adhesive

    We got 144 m2 of anhydrite floor area to tile ,,with 600 ,,600 porcelain tiles to go down on it . We are getting mixed messages as to what adhesive to use , and what sealer to use . So i thought I would consult the Experts on the Tilers forum for some good old professional advice Cheers
  16. Dave

    Tiling to gypsum based substrates/backgrounds.

    Just thought I would see who is using gypsum adhesives when tiling to gypsum substrates/backgrounds . you might be using say anhydrocol or Anhyfix or GBTA etc on say an anhydrite screed but are you now using them on skimmed gypsum walls.? Are you still using cement based adhesives for tiling...
  17. T

    Anydrite screed and gypsum Adhesive

    Hello Everyone, I am about the have my new marble floor tiles laid, I thought I would investigate to make sure it's done properly, it's Anydrite screed and was laid back in mid May, there is sill some laitance on the floor which I understand will need to be sanded, it's tough to get off. From...
  18. S

    Travatine load on gypsum

    Hi all, first post... So go easy ive been to look at a job today for customer having an extension built. I have been called in to price tilling there en-suite. Unfortunately it's been skimmed a couple of weeks ago so I'm presented with a fresh gypsum background. The walls are a mix of stud and...
  19. D

    Tilemaster gypsum adhesive.

    Yes !! Tilemaster will be bringing a gypsum adhesive to the market , fingers crossed it is priced sensibly. :).
  20. P

    Tile on to Gypsum screed (gyvlon low latance)

    looked into tiling on this forum and elsewhere I am thinking of doing sand / scrape off screed, vacuum, Gypsum adhesive, ditra matting , cement adhesive (white), tiles ( 600 square porcelain60 meters, travertine French pattern 25meters ) using Gypsum adhesive saves priming (several coats) and...
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