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limestone

Limestone is a common type of carbonate sedimentary rock. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes have likely been more important for the last 540 million years. Limestone often contains fossils, and these provide scientists with information on ancient environments and on the evolution of life.About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, CaMg(CO3)2. Magnesian limestone is an obsolete and poorly-defined term used variously for dolomite, for limestone containing significant dolomite (dolomitic limestone), or for any other limestone containing a significant percentage of magnesium. Most limestone was formed in shallow marine environments, such as continental shelves or platforms, though smaller amounts were formed in many other environments. Much dolomite is secondary dolomite, formed by chemical alteration of limestone. Limestone is exposed over large regions of the Earth's surface, and because limestone is slightly soluble in rainwater, these exposures often are eroded to become karst landscapes. Most cave systems are found in limestone bedrock.
Limestone has numerous uses: as a building material, an essential component of concrete (Portland cement), as aggregate for the base of roads, as white pigment or filler in products such as toothpaste or paints, as a chemical feedstock for the production of lime, as a soil conditioner, and as a popular decorative addition to rock gardens. Limestone formations contain about 30% of the world's petroleum reservoirs.

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  1. C

    USA Exterior, Limestone on PT Wood Post.

    Hello, First post here on the forum. Thanks for reading! I have an application for 1" limestone at 14" x 3 1/2" on an exterior Pressure treated post which is buried into the grade and sitting on a deep level wood piling. The post will finished on all 4 sides. Just the bottom 2 feet. Above...
  2. E

    Black limestone questions!

    We have just laid an outdoor patio and path using black limestone (now wishing I’d perhaps looked in this forum first)! It hasn’t yet been sealed or grouted, but is already extremely dirty with cement residue etc etc. 1. Recommendations for a suitable cleaner (I know we can’t use anything...
  3. C

    Natural Stone Limestone Floor Tiling

    We're quoting to rip up and replace a tiled floor with Limestone tiles. I'm looking for advice to ensure I allow for proper preparation & any additional/specialist materials that we might need during installation. There will be a new UFH system, likely one that combines a decoupled like Warmup...
  4. C

    White marks on limestone tiles

    Anyone seen this happen before? White marks on newly laid limestone tiles. Apparently not efflorescence. Appreciate any advice wondering if we should continue with sealing them? Thanks Claire
  5. B

    Limestone sealing advice

    Hi, Hoping someone can advise please. Recently had some limestone floor tiles laid and as instructed this morning I cleaned them with a stone cleaner and this evening was going to seal before it’s grouted. Tiles still look damp and wondering if I should leave the sealing? Eager to get the seal...
  6. Kay06081974

    Help with limestone flooring

    Hi can anyone help me please. I've got white patches on my polished limestone floor tried grinding it down no good, bought stain removers no good and won't polish what can I use its my kitchen floor
  7. A

    Natural Stone Slurry grouting using limestone tiles

    Hi,i just tiled limestone tiles 600x400 onto a limecrete floor using Seciltek cal adhesive,i’ll be using this to slurry grout,what ratio do i use please?Is it as spec or thinner? Thanks in advance. Alan
  8. T

    Limestone sealing and cutting

    Hello. Have just taken delivery of our pale limestone tiles (tumbled, cream/beige) and am fitting them myself (have tiled a full travertine bathroom and slate kitchen floor before) so have some experience, however, would you recommend sealing the tiles before they are laid? Also, what would you...
  9. T

    Limestone tiling nightmare?

    Hi all, just after a bit of advice. I've just had some 15mm limestone tiles fitted in my kitchen. I nearly did it myself, but after seeing lots of horror stories online I decided to hire a specialist tiler. He has now done the job (two weeks ago) but the tiles look patchy. The alarm bells are...
  10. T

    Natural Stone Dijon Limestone - fixing & prep advice please

    After some advice please..... We have approx. 50sq m of Dijon limestone 600 x 90 x15mm and also 50 sqm of porcelain wood effect 1200 x 200 x 10mm to lay. This is going onto a 55mm Cemfloor liquid screed (with wet UFH) that was put down about a year ago so should be dry! Really after some...
  11. M

    Subfloor for underfloor heating

    Hello. We're going to be installing large limestone tiles with wet underfloor heating in our kitchen/living area of the house. At the moment it's gutted and we have the opportunity to start from scratch as we're back to the joists. I'm looking to tile on to either 18mm routed cement boards or...
  12. H

    Natural Stone Tile over Limestone or remove and start again

    My bathroom currently has Limestone which was laid on marmox, we are now thinking of replacing with ceramic tiles. Tile shop says ok just to tile over it. This would save loads of work and it all seems secure. So, crack on and tile over or remove back to wall and apply new backer board? Cheers
  13. S

    South East Limestone Flooring - South Oxfordshire

    I have approx 60sq/m of limestone flooring 570x570 and 860x570 that needs laying onto an anhydrite screed. PM me for pictures or more details. Thanks Rob
  14. E

    Dark circles from dot & dab on limestone floor

    Hi everyone, Going through a major refurb on the house and recently had a 13mm limestone floor installed in the kitchen. After a couple of days, dark circles started appearing on the slabs which suggests that the tiler used dot & dab to install (see picture). Not sure what adhesive was used but...
  15. ChrisMc59

    Black Limestone Hearth advice

    Hi All, I often take some knowledge from these forum but today Im looking for some advice myself. I have a 60mm Black Limestone heart that has some marks I cannot shift. At first I thought its was grout/motar marks from tiling but now im not so sure. (Its not as if theres something stuck on...
  16. E

    Limestone floor expansion joints.

    Hi guys, looking for advice. About to install a limestone floor. 900mm x 600mm x18mm on a 50mm poured screed encapsulating piped inderfloor heating sat on 170mm celotex. Ive struggled to convince the builder that I have to use an antu-cracking mat,(durabase probably) but Im having a real...
  17. R

    Natural Stone Sealing limestone Modular Floor tiles

    Hi, Going to be laying a modular floor with limestone tiles. Floor is a kitchen. What sealer would you recommend? And what is the usual coverage? Also how many coats needed? Thanks in advance
  18. K

    Black limestone stains

    Hi all I laid a full patio with black limestone last October on a full layer of concrete. I didn't use grout and used joint it simple. Brushed it in then soaked it. From day 1 the patio had a silver grey look and never looked black. I was advised not to seal for 12 weeks and to make sure it was...
  19. S

    Limestone fireplace installed but adhesive stains all over how do I remove?

    Really need a professional to remove the stains left by adhesive on limestone fireplace any advice welcome. Desperate seeking resolution! What products should I use?
  20. M

    limestone colour advice

    Hello We had limestone tiles installed and,at the time, the tiler said he had run out but not to worry he had some spare in his van. The two tiles he put in are noticeably different (darker) than the rest. Last week we had a damp mat on the tiles next to it and when we moved the mat the tiles...
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