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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. M

    Best liquid DPM

    Anyone know or have used a liquid DPM before? Got a job coming up where I was going to be levelling and tiling a ground floor kitchen area. The customer has lifted the old tiles and has discovered damp patches on the solid floor. They have asked their builder to look at it who has told them to...
  2. K

    Our new house with quarry tiles - how can I stop damp?

    Hello, I'm currently removating our new house and we have quarry tiles in one of the living rooms which are in good condition. The room has been drilled and a damp course installed but I'm wondering what to do to stop damp coming up through the quarries. There's no obvious moisture on/in the...
  3. T

    Damp Bathroom Walls

    Scenario: Very old terraced house - downstairs bathroom - brick walls - bonded and plastered (about 15 years ago it was completely stripped and redone) - damp coming through from outside - mould behind the tiles and in the plaster - tiles fall off - needs re-tiling Damp problem has not yet...
  4. B

    Tiling On Damp (ish!) Concrete Floor

    My bathroom is on the ground floor of my circa 1900 end of terrace house in Sussex. It had lino on the floor and when I took it up I found the underside of the lino to be mouldy looking - though the concrete floor underneath seemed relatively dry to the touch. Thinking it was just condensation...
  5. M

    Tiling Dilemma With Damp Wall Substrate

    Hello all, I seem to be in a dilemma with the tiler and tiling my bathroom. First of all, things to bear in mind are that the walls are slightly damp and I have gone for porcelain tiles. The walls have been treated with a damp proof course but I have been advised any previous damp may remain...
  6. R

    Damp Issue

    Hi all. I went to look at tiling a bathroom the other night. The bathroom has been treated for dampness issues, they have had the DPM replaced and the walls were replastered about 4 weeks ago. First thing I spotted was some black dots on the new plaster (pics attached) The only times I've...
  7. H

    another cottage job but walls are damp!

    Was out today pricing a large bathroom in an old cottage and 2 of the walls are very damp all over the wall. Its already tiled and tiles have been on over 20 years and I noticed the damp where the customer already removed some tiles. I'm surprised these tiles are still on and TBH, they are well...
  8. I

    Tiling a slightly damp floor.

    Hi Guys, Apoligies if i post int he wrong section its my first time ive used this site and i hope to be using it quite often now as i have seen some good advice posted. I have a 2 bedroom ground floor Flat i need to get tiled, im fairly good at tiling myself so will give it a shout. Only...
  9. S

    Damp meter

    I want to get a decent damp tester can anyone recommend a good one? I've only got a crappy one from fleebay and not sure how accurate it is :-/
  10. P

    no damp course in floor ??

    hi am hopeing some of you can share some advice to this problem, here goes. i have a client who has no dpc in his floor and does not want a liquid dpc painted on top prior to having floor laid. the floor needs to be primed then a few places need some self leveling compound before covering with...
  11. M

    Help with damp wall please

    Hi I've got a job taking out a bath and installing a shower in its place. The bathroom was originally fitted out about 8 years ago by a local company and the reason the client wants it done is because they are struggling to get in and out of the bath, so it just involves removing one course of...
  12. E

    Damp

    Hi all just a quick one I've got an outside shed that's been boarded and plastered in the past but sufferers from damp mainly staining. Do you think giving it a few coats of Mapei Aquadefense and then just painting over it would stop it.
  13. M

    how to re instate the damp proof membrane

    hi all just ripping out a 1940s bathroom today, floor was tiled, got me breaker out and first one lifted no pobs, no wonder it was stuck to vynal tiles on 20mm bitchumen.this bitchy is right the way through the ground floor,sounded hollow, so breaker again and come up in 3 ft squares, no...
  14. U

    Tiling on to damp skimmed plaster

    Hi, We are getting a new bathroom installed and could do with some advice. The old tiles were removed and the walls have been skimmed with a thin layer of plaster as part will be painted. The plaster was only completed yesterday and today they are tiling the walls. Does this seem too soon...
  15. A

    Damp marks showing through tiles

    Hi I've just had my bathroom tiled in white matt ceramic/porcelain tiles and today I noticed shadow spots on all the tiles. The tiler explained that it's the moisture from the adhesive coming through the clay back of the tile and that it will dry out. I'm not confident with this answer because...
  16. O

    damp pamments advice.

    i am looking for confirmation of what i think i already know. the situation is i do some jobs for a builder, jobs that i rarely see till i get there, this is one of them jobs. we have a 10mts floor on fiber board im too fit 30x30 20mm thick pamments (i think there just terracota, in norfolk...
  17. L

    Damp wall or condensation would you tile on it????

    Hi Guys. Have to do 16m2 of wall tiling (little toilet -local barber) Walls are getting damp all the time.Client had survey done by the company dealing with raising damp they said its not raising damp.Client thinks it might be caused by condensation???(room is 2m by 1m had extractor fan fitted...
  18. J

    Need advice on tiles and adhesive for a fireplace with rising damp

    We have a fireplace (housing a wood-burning stove) that has significant rising damp. It is constructed of brick, rendered and plastered - the brick is too uneven to just leave bare. We have tried twice to have the rising damp cured with an injected damp-course but without success so we would...
  19. K

    tiling a damp bathroom advice

    Hi everybody, newbie here, I have got to tile a damp bathroom soon, with cheap ceramic tiles, I have unibonded the walls, which are painted, have loosened all the loose paintwork, It has taken two days for the unibond to dry, any suggestions which adhesive and grout to use, worried about the...
  20. C

    Damp - rented house - where do we stand

    I'm living in woodford green on the outskirts on east london. Essex by post code. We are renting a one bed flat, quite nice considering the price of others in the area vs quality. All has been well until the cold started setting in and we realise now there are no air bricks so to circulate the...
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