Screed has three meanings in building construction:

A flat board (screed board, floating screed) or a purpose-made aluminium tool used to smooth and to "true" materials like concrete, stucco and plaster after they have been placed on a surface or to assist in flattening;
A strip of plaster or wood applied to a surface to act as a guide for a screed tool (screed rail, screed strip, screed batten);
The material itself which has been flattened with a screed (screed coat). In the UK, screed has also come to describe a thin, top layer of material (sand and cement, magnesite or calcium sulphate), poured in situ on top of the structural concrete or insulation, on top of which other finishing materials can be applied, or the structural material can be left bare to achieve a raw effect.

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  1. M

    Screed/Overboarding Question

    Hello all. I've got a question for people who know better on what to do with my floor. I thought it was T&G over substantial joists so my plan was overboard with ply, seal the joins and tile as I have for previous projects. However, I've gone to lift a board (as I want a radiator pipe putting...
  2. T

    Which screed would you recommend for wet UFH ?

    Hi folks, Just looked at a conservatory tiling job. Wet UFH system, set into sand and cement approx 50mm thick. Fitted 2 months ago so should be cured. Heating yet to be commissioned. The sand and cement is dog rough, going to need prepping to level the floor ready to receive 500mm x 500mm...
  3. J

    Replacing screed - help needed

    I've got a very thin layer (3 or 4 mm) of screed over old bathroom tiles which we had link flooring put over. Unfortunately the toilet leaked and the lino was damaged, I've pulled it up and found the screed below is slightly damaged. I've cracked and pulled up the offending bits but am I...
  4. A

    Water UFH Is a dry enough screed actually perfectly dry?

    I had anhydrite screed laid 28 days ago, commissioned ufh 21 days ago and have proceeded to test with a hygrometer for RH test. Its showing 45% which seems low given the threshold is 75%. The question comes from when I move the odd item like a cardboard box, where the tape has been in contact...
  5. Joel DIY

    Expansion joints in screed

    Hello fellow tilers forum community, I have laid underfloor heating mats on top of insulation boards and poured screed over the top of the mats. I forgot to add any expansion joints and am concerned about what to do. Any advice will be appreciated before I move forward with tiling the floors...
  6. L

    Tiles that have removed the screed when removing the tiles

    Hi all I hope you are well. After a bit of advice. I am installing some plumbing under the floor in a kitchen which is getting re done. I did to the client I would take the tiles up do I can run my pipes etc. Any how, half the kitchen is 12mm plywood screwed down every 100 on to floorboards. I...
  7. S

    Anhydrite screed prep

    A simple question I'm struggling with. Up front, it's a self build - my 4th, so done a fair bit but 1st time using anhydrite. Screed down for 4 years+. Prepping for ditra. Started sanding with 40 grit using 6"festool orbital to remove laitance - solid - (so may have to use diff tool). Issue I...
  8. Troystar

    General Question Floor tiling on screed with no visible cracks

    Could someone give me some advice please. I'm a landscaper by trade and have laid a few porcelain patios. Now I know interior tiling is not the same but would like to have a go at my downstairs toilet floor. House was built early 2000s I think its screed but could poss be the wet slurry with no...
  9. N

    Preparation Anhydrite screed prep

    Hi guys technical question hoping maybe you have an answer as I have never came across this before we have an anhydrite screed floor we sanded it hoovered then sealed twice came In Today and the sealer looks like it’s peeling in certain areas have u ever had this the floor is completely dry...
  10. J K Tiling Cornwall

    Poured concrete screed preparation

    Hi everyone. I have a floor tiling job coming up that is a poured concrete screed over piped underfloor heating. The screed has been down for many months (completely cured and underfloor heating has been ticking over on low). My issue is that the surface is quite smooth with a light sheen. Would...
  11. A

    Adhesive Ardex A29 quick set screed

    First time using this and it says it can be tiled on 24hours after application. I'm looking at it, it's firmed up but still has the wet look all around it. I was thinking maybe it would have dried out quicker than this or am I overthinking it. I want to use green screed addy, bal red anti...
  12. A

    Sand and cement screed down. How long

    I have a newly laid screed 75mm thick sand and cement laid 2 weeks ago. I'm stuck for time and need the ensuite floor tiles asap. Is there any products you can recommend for me so I can start laying now rather than wait another few weeks before it's fully dry.
  13. M

    Porcelain Tiling onto calcium based screed

    Hi, just after some advice if anyone can help. I’ve just poured the floor on my extension at 110mm thick using Agilia (calcium based). I am wanting to tile in about 5-6 weeks but after reading a lot on this it has become apparent there will still be moisture in the floor and I should wait for...
  14. R

    Do I need a Ditra Matt on c30 dry screed?

    Hi guys We are laying porcelain tiles 120 x 120 on a c30 dry screed on top of wet under floor heating 55m2 and I would like know if we need to use a Ditra Matt or tile straight to screed with a flexible tile adhesive ? Thanks Raff
  15. L

    Very large format porcelain, partial anhydrate screed UFH

    Forgive me for I am noob... I have a 9m x 9m floor area that is one space, but half is a new build extension and half is 1920's old house Situation: The new build half has a Anhydrite screed floor with UFH. The old half is concrete floor WITHOUT UFH. The tiles are 1200mm x 600mm porcelain. The...
  16. A

    Slate over Anhydrite screed - commissioning a

    Hello 45mm Anhydrite screed (Aggregate Industries 'Highflow') is now dry (moisture tested by contractor). Thoroughly dried out with 2 x dehumidifiers running 24x7 for 45 days. Wet UFH system in screed - but boiler is not yet installed - so can't take the floor through a thermal stress cycle...
  17. J

    Flagstone Floor Screed Depth

    Hi, I am in the process of building a house and I am planning on using a thick flagstone (Supplier recommends allowing for a 35-40mm laying thickness) on my kitchen diner floor, I am using a sand and cement screed that building regs state should be 65mm thick with UFH. I want the house to flow...
  18. B

    Porcelain tiles on top of 90 day old screed

    Hi After some advice, I am a DIY tiler and going to be tiling our kitchen extension floor with porcelain tiles ( have tiled before so confident with tiling). We had the screed laid (sand/cement @ 75mm) about 90 days ago, I’m confident it dried and has no cracking anywhere and level. The screed...
  19. M

    Tarmac Flowing Screed - Yorkshire & Humberside

    Local, concrete & flowing screed specialists. Competitive rates Quality assured concrete & flowing screeds Small loads of concrete from 0.5m3 to 4m3 Flowing screed loads from 1m3 to 6.5m3 Dedicated flowing screed plant Free technical advice for DIY & building projects Direct Message us for...
  20. N

    Screed / SLC over old marleys

    Hi all, I have a room full of old asbestos marleys in good condition (apart from a few chips by carpet grippers). Can anyone recommend a screed / slc to go directly over the top of the tiles? I don't want to pull them up. Thanks