Grout is a dense fluid which is used to fill gaps or used as reinforcement in existing structures. Grout is generally a mixture of water, cement, and sand and is employed in pressure grouting, embedding rebar in masonry walls, connecting sections of pre-cast concrete, filling voids, and sealing joints such as those between tiles. Common uses for grout in the household include filling in tiles of shower floors and kitchen tiles. It is often color tinted when it has to be kept visible and sometimes includes fine gravel when being used to fill large spaces (such as the cores of concrete blocks). Unlike other structural pastes such as plaster or joint compound, correctly mixed and applied grout forms a water resistant seal.Although both grout and its close relative mortar are applied as a thick emulsion and harden over time, grout is distinguished by its low viscosity and lack of lime (added to mortar for pliability); grout is thin so it flows readily into gaps, while mortar is thick enough to support not only its own weight, but also that of masonry placed above it.

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  1. T

    Lithofin cleaner on new grout

    Hi My tiler didn’t clean the grout haze from my new porcelain tiled floor. It’s not a glazed or polished porcelain. I have used lithofin cement residue remover on the whole floor but I didn’t saturate the grout joints with water first. I lightly sprayed the floor with water before applying...
  2. S

    Grout paint. Any experience?

    Customer has changed her mind about grout colour. These are glazed ceramic metro style tiles . I am reluctant to re-grout because of the risk damaging the edges. Have you tried painting grout? Which way would you recommend, re-grouting or painting?
  3. D

    150x900mm floor tiles - 2mm grout and 50:50 pattern

    Builders have installed 15x 900mm tiles with a 2mm pattern and 50:50 brick effect. They suggested 2mm (I previously suggested 4mm), I probably suggested 50:50, but did not know that grout / pattern effected anything but aesthetics. There is now widespread lippage due to what I am told is...
  4. A

    Missing grout + Hollow patio tiles

    My patio is laid with travertine tiles. The grout under the tiles around the 3 sides( appx 15 tiles) is missing, the tiles are sounding hollow and some are cracking. Is there anywaterproof grout I could inject into them - I can't afford to have the patio relaid.
  5. M

    Adhesive Adhesive & Grout Recommendations for Bathroom

    Hi Everyone, I’m a new DIY tiler looking to do my bathroom and downstairs toilet. The amount of adhesives and grouts out there is a little overwhelming and confusing for us newbies so was hoping for someone to shed some light on which ones would be best for me… Substrates: The bathroom has new...
  6. S

    Internal shower and niche corners..Grout or sealant?

    What would you guys recommend to finish the internal corners on this niche? Grout or sealant? The niche is inside of a shower cubicle Already grouted the corner of the cubicle then thought maybe it should have been sealant instead. That can be corrected if need be but wanted to double before...
  7. M

    Lithofin grout sealer not living up to expectations

    I've just painstakingly scrubbed/cleaned my kitchen tiles (& grout) with Lithofin Power Clean MN, which did a great job. Bought some Lithofin grout sealer to finish off the job, which is proving to be really disappointing &, in all honesty, a waste of £20. After 2 coats (& sore knees), and...
  8. A

    Advice for grout and edges please

    Hi, I’m tiling my kitchen (first attempt at tiling) and have a couple of questions. 1) what can I do to sort this edge where it meets the splash back? I thought I could grout it but the tiles aren’t all the same length and I think it’ll look rubbish. 2) my wife wants to use a light grey...
  9. I

    Grout cracked few weeks after installation

    In about 2-3 weeks after we got our bathroom fitted we noticed that the grout cracked along one of the walls over its entire length. The floor and other walls were done with the same tiles and grout but this joint is the only one that developed a crack. Attaching the pictures. We had to replace...
  10. M

    Grout colour difference

    Hi - any advice would be gratefully received. The colour of the grout in my bathroom varies from light to dark grey. I used Elise Pink Hexagon Wall and Fall Tiles from Victoria Plumbing, and Mapei flexible wall and flour grout in Grey. My bathroom fitter installed the tiles. At first I...
  11. B

    Porcelain Any idea how to clean all this grout remainder?

    Hiya. DIY idiot here. We've installed some nice new tiles on our floor. We then grouted with Mapei Ultracolor Plus (Silver Grey). There's a lot of white residue left behind after cleaning with a cement residue remover, and the grout feels a little bit chalky. I don't know whether we're on the...
  12. GaryMo

    Grout Which wetroom grout?

    Hi, I'm new to the forum and a DIY tiler. I'm working on my wetroom, 3m x 3m box, wall and floors fully tiled. I've put Aquaseal tanking on the walls and impey waterguard tanking on the floor and over shower former (impey as well). I've used Setaflex adhesive. It should be 100% solid...
  13. E

    Waterproof grout - is it a pain to fit?

    My builder has laid floor tiles in our bathroom - including in the shower area and has asked me to get some waterproof grout. I'm not sure if that's the right approach. From the reading I've done, it looks like I could either use normal or water-resistant grout and then add a sealer, or I could...
  14. D

    Freaking Out! Grout lines darkening

    I thought I did everything right--my 13 inch tiles came down and stopped 1/8" away from the tray, I filled it in with mad adhesive, and sealed the grout 3x. Then I noticed, after a few showers, One dark grout line. You can see it in the bottom right of the pic. So I dug it out, and yes, there...
  15. N

    When to apply grout to shower walls & floor and bathroom floor tiles

    Hello, I'm renovating my 2nd floor master bath. I'm about to lay down tile in three areas... on the shower floor first, then the his and her side bathroom floors, and finally the shower walls - in that order. My question is... Should i grout immediately after each tiled area's mortar it...
  16. S

    How much grout for metro tiles

    I have approx 14sqm of 200 x 100 ceramic metro tiles to grout, tiles are 6mm thick with 2mm spacers. Would a 5kg bag of grout (Mapei Keracolor) cover it? I've used a couple of grout calculators online which say I need less than 5kg but this just doesn't look enough to me? Have to order this...
  17. Minmax89

    Epoxy grout advice needed

    Hi there, Can anyone recommend an epoxy grout to use with ceramic and porcelain tiles please? I’d like to start mitring external corners of shower niche’s etc but I’d to practice at home first before I try it on a job. The plan would be to make a few test pieces and practice at home first. It...
  18. G

    Grout sealer for cooking area

    I have a brick effect red brick type tile splashback at home, porcelain tiles. They have been up a couple and are still very clean Behind the cooker we put up board or cutting mat to stop any splashes but it's getting about tiresome. I'd rather not go for a glass or stainless steel cover. What...
  19. D

    Adhesive How to get a good grout line finish on slightly rounded edges

    Hi everyone, The floor tiles I have are 600x600 white gloss which have a slight rounded edge to them so how do I get a purfect grout lines? will the normal wash with sponge achieve this just like the flat edge tiles or do I need a tool to do this? Thanks in advance, Gary.
  20. GreigM

    Weber Premium Grout - grey - issues!

    Hello all, Has anyone experienced issues with Weber Premium Grout? Was applied over 3 weeks ago and has various patching issues. I have contacted Weber but they are useless! Rather than accept liability that there is a problem with their product, they are suggesting that the environment...