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damp

Structural dampness is the presence of unwanted moisture in the structure of a building, either the result of intrusion from outside or condensation from within the structure.
A high proportion of damp problems in buildings are caused by ambient climate dependent factors of condensation and rain penetration. Capillary penetration of fluid from the ground up through concrete or masonry is known as "rising damp" and is governed by the shape and porosity of the construction materials through which this evaporation limited capillary penetration takes place. Structural damp, regardless of the mechanisms through which it takes place, is exacerbated by higher levels of humidity.

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  1. T

    USA Damp Course Membrane Distance - Critical?

    I have removed my old patio 60cm x 60cm concrete slabs which started from the back door of my house to the start of my garden, roughly 2.4 meters. The end of the patio is supported by a 2 course brick container wall running the length of the patio, about 4.4 meters. I have laid the hard core and...
  2. S

    Quarry tiles and damp

    Hello - first post please be gentle. I am rennovating a typical 1930s semi. I am doing some research into the flooring in the kitchen. From what I understand these are "quarry tiles"? Everything online saying they need to breathe. And that adding a screed on top (even with dpm layers) could...
  3. L

    tiling directly onto damp proof membrane

    hi guys, i have some damp-proof membrane installed in my bathroom floor(Capital Valley Plastics Ltd Damp-Proof Membrane Black 1000ga 15 x 4m - https://www.screwfix.com/p/capital-valley-plastics-ltd-damp-proof-membrane-black-1000ga-15-x-4m/22842). Is it possible to tile directly onto this?
  4. C

    Plaster damp and damaged behind tiles in shower

    I had a few loose tiles in the shower so decided to remove them, I’ve now taken quite a lot off and all the plaster is damp and soggy. I was planning to rip it out and start again, just not sure if to plasterboard and tank or use a waterproof board like Kerdi board / Wedi board, as this says...
  5. M

    Front path slab ( possibly has rising damp) - can I tile on it?

    I hope you guys can help me. IN my own home, I have screeded in a front path slab because the old one was a bit cracked. My new slab isabout 150 mm of hard core and 100 mm of sharp sand and cement. Stupidly I didnt include a plastic membrane. An area of the path seems to be not as dry as the...
  6. S

    My 1st Job Tiling bathroom with damp issues - best practice?

    Morning all. I found this forum via this thread (and Google). It's as close to my own situation that I have found so far, so hoping for some advice from you experts. I've done a lot of reading and know this is a difficult one to diagnose remotely - so have included as much detail as possible...
  7. S

    Pictures Time to call in a professional?

    Hi. New member here looking for some advice. I’d noticed some cracked grouting on my shower cubicle tiles. Decided to remove the old grout and redo it. Some of the tiles then felt loose so removed those, and now I see damp plasterboard underneath with what looks like black mould! I’m using...
  8. H

    Damp patches on white floor tiles

    Hi A few days ago I liad white ceramic floor tiles, the next day dark patches appeared under the glaze , some tiles went completely dark , after three days the dark / damp patches have not dried out, the tiles wrer laid on thermal board with electric heat matt on top, rapid set adhesive...
  9. C

    Tiles Turning Grey

    I recently had some large white tiles installed. I've noticed three near the bath have turned grey. It looks like the sealant wasn't done very well. Fortunately, I have a few spares. Presumably water has soaked the tiles and has nowhere else to go (except sideways, it seems). I obviously need...
  10. snackeroo

    What could be causing this? - damp behind tiles? - wet grout

    It looks like water seapage coming through the grout, but cannot feel any wetness. Water pipes are below the tiles pictured. Could it be dampness behind the tiles through poor prep work?. I don't know to be honest, so am purely guessing from logic. This first appeared 2 days ago. (Part of an...
  11. area tiling

    Damp proof course recommendation

    can anyone recommend a good paintable damp proof course that they have used before , that can be tiled on , and is fast setting ! Thanks
  12. Lakey

    Preparation Damp proofing concrete floor

    I have a concrete floor to tile in a house built in the 1500’s. Can I paint the floor with Black Jack/Synthproof or something similar before Weber SLC? I will be laying Ditra Duo after SLC.
  13. jobdone

    No damp course under quarry tiles

    Can any give me some advice on how to deal with a problem with a floor in a Victorian house. The quarry tiles have been lifted and the customer wants to keep the floors level when finished. Here lies the problem as insulation board and ufh (electric) is going down well which means excavating the...
  14. J

    UK Farm kitchen | damp wall

    Hello all. I previously posted regarding some failed tiles in a farm kitchen. The walls have sand / cement render and was due to damp issues. The suggestion was to remove the render, replace with hardibacker or similar (thanks for the advice). My question is related to will the hardibacker...
  15. O

    Arrrgh! Damp after removing tiles!

    Just taken the tiles up on my present job. The floor is damp! I’m guessing that’s put a stop to this job until my customer sorts it. So annoyed!!
  16. J

    Damp wall going to be tiled

    hi guy gonna keep it short have bit of mold on bathroom wall coming from a cupboard in the stair to the flats, I was gonna start tiling next week but unsure now, I had a builder in he seen I had a tanking kit and said paint wall with that mold won’t come through, I’m unsure tbh just want second...
  17. D

    Liquid Damp proofing Old Floor

    Hi Guys, Ripped up some tiles on an old floor today. Some of the tiles were came up very easily and there was a very slight damp feel. It's obviously very minor rising damp as the tiles have been down 30 odd years. I've looked at the mapei epoxy dpm but it's pricy and only need a very small...
  18. T

    Damp concrete kitchen floor..... another one. Mapei Triblock P?

    Doing some tiling for a friend in a few weeks 9 sqm kitchen floor. house built 1912, no DPC/M that we can tell. Lino recently lifted and the floor is wetter than an otters pocket. (ok, slight exaggeration, but definitely suffering from a small amount rising damp (currently testing and...
  19. Susiequ

    Preparation Tiling a concrete floor in a room that used to be outside

    I have been asked to tile a concrete floor (not seen yet) that was an outside floor but has been incorporated into a house. It lets damp through. What prep is needed?
  20. Andy Allen

    Quarry floor, no damp course.

    Look at a floor today Problem is it's a 200 year old house, no damp course and quarry tiles down. They want porcelain tiles fitting on top the quarry tiles.......obviously not keen on that idea......but before I bin the job....anyone got any suggestions on how it can be done..?
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