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expansion

Thermal expansion is the tendency of matter to change its shape, area, volume, and density in response to a change in temperature, usually not including phase transitions.Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, molecules begin to vibrate and move more, usually creating more distance between themselves. Substances which contract with increasing temperature are unusual, and only occur within limited temperature ranges (see examples below). The relative expansion (also called strain) divided by the change in temperature is called the material's coefficient of linear thermal expansion and generally varies with temperature. As energy in particles increases, they start moving faster and faster weakening the intermolecular forces between them, therefore expanding the substance.

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  1. G

    Expansion grout gap

    Hi I’ve tiled my bathroom floor on top of hardie cement board. I have left expansion gaps all around the wall when I layed cement board. When I grout my floor tiles the grout is going to pour down all the edges into expansion gaps. Is this ok as the grout is flexible? Any help would be...
  2. M

    Tile expansion joint - small bathroom and boarded

    Hello I have a 3 x 2.4m bathroom. Floor is 25mm ply overboarded with 6mm cement board. Walls are a mixture of brick & stud that have been boarded with either foam tile backer board or moisture resistant plasterboard depending on area. For a room this size and with those features is an...
  3. T

    Expansion joint with detra matting

    Hi all So my tiler laid 125m2 and in the doorways and across the living room floor left the grout out so I could use a larson mastic joint for expansion purposes.(didn't have the mastic in stock when the floor was laid) My quandary is the detra matting under the expansion joint is not split so...
  4. 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...
  5. G

    Electric UFH Expansion worry with heated tiled floor

    Hi guys, I have installed ditra heating mat with electric underfloor heating over a 35 square meter area in my kitchen area (rectangle shape, empty room with no kitchen cabinets). I also planned out where the heating wires were to go and not go in regards to kitchen cabinets not sitting directly...
  6. 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...
  7. D

    Tile expansion gap

    Hi guys, I'm tiling a large floor area 30 square meters (rectangle shape room) using 600x600 porcelain floor tiles and leaving 3mm grout joints. I understand that I need to leave un-grouted expansion gaps around perimeter of the room and also understand that I need to leave un-grouted expansion...
  8. TCI589

    New subfloor no expansion gaps

    Hi all, First time DIY tiles here. We fixed down a hardibacker subfloor yesterday with rapid set adhesive, etc. On 3 walls weve filled in the gap between the board and the wall in a complete brain fart. Overnight with the window open, we heard a series of popping noises from the floor. Is...
  9. D

    Natural Stone Limestone expansion joint advice

    Limestone Expansion Joints I was wondering if some of you experts could offer some advice. I have had a limestone floor laid recently on flexible adhesive. The tiles are various lengths and are 600mm wide and 30 mm thick laid on a bed of 10mm thick flexible adhesive. The tiles abut the walls...
  10. J

    Tiles against brick edging – expansion gap?

    Hi all, new signup here beginning first tiling job. We've got a conservatory room at the back of our house in which we're laying some quarry tile. We've figured out the spacing, and happily the room is pretty square (3mm skew for just under 4m), so we're beginning our layout on the left hand...
  11. C

    General Question Expansion joints in plank flooring

    Good evening Im a professional bathroom fitter and have good experience in this field but not large floors. Can somebody give me a few pointers please. I've a large L shaped kitchen/diner the has a traditionally screeded floor with a wet underfloor heating system. I'd like to lay some...
  12. P

    Expansion Strips!!! - confused!

    Hi I have tiled several floors over the years, but have now taken on my largest task which is circa 100sqm... I would value any help on expansion strip placement/requirements as the regs have confused me and I have not found a post on here that applies to my situation. Any positive criticism...
  13. B

    Big bit of ply, or cut into smaller bits?

    Hi I am redoing our bathroom. I'm going to be laying 18mm plywood on the joists (16in centres, with noggins) and tiling on that using a decoupling membrane (Ditra 25). My plywood is 2440x 1220mm. Is it better to lay the plywood in one big sheet or cut it into smaller sheets with 3mm gap...
  14. Bopster

    Expansion gap

    I'm going to be tiling a conservatory floor which has wet ufh. 3 walls are metal frame of conservatory other wall is a combination of skirting board, expansion joint to tiled floor. My question is on the 3 metal walls how much room do I leave for expansion? I'll be using colour matched silicon...
  15. M

    Pictures Expansion strip needed?

    Hi all, Wondered what the correct procedure is here.. this is a doorway with timber on the left and concrete on the right, plan is to overboard the lot and have ufh over the timber area only then levelling compound the whole area. i would think I'd need to create a join with the boards and...
  16. T

    My 1st Job Expansion joint advice

    Hi all, I have done a few smaller tiling jobs previously, and I'm about to tackle our kitchen floor and and could do with some advice. The floor area is 7.6M x 4.7M and the tiles I am using are 600mm x 600mm x 10mm porcelain. The floor is concrete, no underfloor heating and I plan to leave an...
  17. C

    Expansion joint

    Hi all i have expansion joints that are on the wrong side of door openings. Should i recut them or will 40mm makke a difference if i go over it. Its more of a issue as im using 1m×1m tile so not so handy to replace if they crack. Floor is also ufh. Thanks charlie
  18. chowyunfatt

    Expansion Joint or Not?

    Hi, I would like a bit of advice regarding 2 tiling areas if anybody can help? First is a hallway 11m x 2m onto 30mm jackoboard with 250mm x 250mm porcelain tiles, at one end joining a kitchen I have a expansion joint and at the other end of the long run there is a gap of 4mm to the front...
  19. L

    Screed - External Porcelain Patio

    Hi Got a project due to start in Easter, approx 45m2 patio of porcelain tiles. I have already laid the screed last year to allow it to dry for the 6-8 weeks recommended, with a 1/60 fall. I have 2 questions now Should I have left an expansion gap in the screed? There are 4 different areas...
  20. N

    Expansion Gaps

    New to the forum – excellent information! We have a large floor area tiled in a holiday home in Florida where there were some record temperatures last month. The tiling was done when the house was new 21 years ago onto the concrete slab base of the house and looked an excellent job. Two tiles...
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