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  1. J

    KA tanking & rendering garage walls

    I would clean the retaining wall well, apply brush coat or two of an anti sulphate solution,SBR, two coat tanking slurry , coat with your render to protect tanking , job done. You may have to return the tanking around side wall a bit where it meets the retaining wall.
  2. J

    Wet dash

    Harling, (wet dash Roughcast) Three coat system.
  3. J

    Wet dash

    If it’s getting painted, aye. If it’s white or colour - mix enough to complete the wall/elevation.
  4. J

    Wet dash

    With a 6 mm chip, 3:1:1. Works well with a small belle mixer.
  5. J

    Wet dash

    Hand cast or Box ?.
  6. J

    Render Advice

    The British climate. !! That’s just the start, in a few years that render will be discoloured especially if it’s on a weather elevation. Without a decent projection protecting the wall, concrete coping stones at the wall head, it’s just a matter of time , rain will penetrate eventually. You...
  7. J

    SBR

    If it’s a new block work wall, no need for SBR. Unless it’s a high suction background and you want to kill the suction. Hosing down and Waterproofer and plastisicer in the mix will do. Having said that, it’s a great product for improving workability etc,.
  8. J

    INJECTION DAMP PROOFING FROM OUTSIDE

    Yes you can inject your wall. Perhaps with a water based system as it diffuses into damp mortar better than trying to displace the moisture like a spirit based system. ( inject the mortar line not the brick). A better system of course is inserting a physical dpc system ,( probably not practical...
  9. J

    INJECTION DAMP PROOFING FROM OUTSIDE

    If you have two walls which are waterproofed (tanked) then you can can get damp rising ,because it can’t evaporate from the wall (chimney effect) ,unless vapour permeable tanking system. Injecting a chemical DPC at the flat above is unlikely to do any good. (a waste of good money l would say).
  10. J

    Opinions please

    Cut corner bead with an angle grinder at 45 degrees and hack off.
  11. J

    Another Artex question - sorry!

    Try a wet ardex mix and apply on a painters roller, looks like that’s the way it was done originally hence no stipple peaks.
  12. J

    Small mould problem on newly plastered wall.

    Soluble salt will be deposited on wall surfaces that moisture is evaporating from.
  13. J

    Potential damp cottage wall - Help

    Or even years, that textured paint system would definitely prevent evaporation. However you need to establish the source of moisture before you can best deal with the problem. As stated above hack off existing and lime plaster or dry line the wall.
  14. J

    External insulation butting into stone wall

    Some sort of vertical flashing detail, in lead/ copper etc. That stonework is amazing.
  15. J

    Is this the cause of my damp?

    I get what you say, as above, however water passing through a structure and evaporating from the surface of an internal wall, you would expect to see some damage to the decorations, in the form of efflorescence, blistering, etc. The damp staining evident Is rising into the corner, and mould on...
  16. J

    Is this the cause of my damp?

    could be condensation, l see some black spotted mould on the surface.
  17. J

    Vertical damp patch on brick - No one knows what it is!

    Aye it’s a bit of a mystery right enough, if it interstitial condensation, ( condensation forming within the wall structure, l don’t think there would be any evidence on the insulation it would be forming on the cold outside leaf of the cavity wall and be absorbed by the brick.
  18. J

    Tanking slurry and internal render

    Best to use a renovating plaster like that suggested above, however if you are still going with the render, dampen surface of tanking slurry and prime with SBR and cement with some sharp sand thrown in for good measure.
  19. J

    Damp proofing basement

    Loads of systems for basement waterproofing, if you’re going down the tanking slurry and plastering route, then ld go for a renovating plaster rather than s&c render. As with all damp basements drying out with ventilation or heating and dehumidifier is key.
  20. J

    House been rendered in Weber - advice wanted

    Payd money into his personal account , suggest HMRC may be interested in that.
  21. J

    Vertical damp patch on brick - No one knows what it is!

    Defo’ think sparky in fitting the outside socked box has displaced cavity/wall insulation causing cold bridging- condensation. I would remove a brick or two at top and bottom of damp patch and try and reinstate insulation, ( if that is in fact the problem).
  22. J

    Vertical damp patch on brick - No one knows what it is!

    A very defined area of damp, l think if the source was from rain water it would be less well defined. Could it be from condensation from cold bridging, there appear to be a lot of cavity vents. Think you need to get someone to take moisture readings on the surface and within the thickness of the...
  23. J

    Flat affected by damp

    All depends on the levels of moisture involved ,porosity of the affected building materials ,rate of drying etc and being in a basement it’s going to probably take months rather than weeks.
  24. J

    Water ingress stone cottage

    As you cannot reduce the ground level and presumably that means also cannot drain or do anything to prevent lateral penetrating damp externally therefore your options a very limited, lime plaster will allow the wall to breath/dry , a dehumidifier will assist in this. Long term l think its just a...
  25. J

    Tanking- slurry or bitumen

    If the walls have been subject to rising damp and you have installed a remedial dpc, the main issue you are left with is residual moisture and salts. A renovating plaster designed for damp walls is the way to go, applying a anti- sulphate to neutralise the salts, prime with SBR and plaster away.
  26. J

    Re-appearing crack in wall.

    I used masonry nails with stainless steel washers, was following building surveyors spec’.
  27. J

    Re-appearing crack in wall.

    You can get stainless steel mesh better than galvanised. Once patched over a crack used a strip of building paper with mesh fixed over. Like your bridging over the crack.
  28. J

    What's best way to deal with this

    Aye, looks like fyfe stone popular in the seventies and eighties as a feature panel, l would render and key it Like Ashlar.
  29. J

    Tanking- slurry or bitumen

    Personally ld go for a two coat cement based tanking system something like Sovereign Hey-di system, especially if there is hydrostatic pressure- water pressure through the walls. Correct preparation and products is key as always.
  30. J

    Rendering below dpc

    Then follow K rends recommendation use Bellcast bead, K.Bead, for use at dpc level to ensure water run off.
  31. J

    Rendering below dpc

    Depends on the system.
  32. J

    Rendering below dpc

    I get what you’re saying about modern renders. I was thinking more about traditional painted wet dash situation as is the norm in this part of the country. ( north west highlands).
  33. J

    Rendering below dpc

    Anything that will help in preventing moisture entering into the sub-structure is got to be good, frost damage ,spalling ,discolouration algae mould growth etc.
  34. J

    Rendering below dpc

    Bellcast beading is specifically designed for use at the dpc line, the bell effect slows down surface rain and because of the way it’s angled help prevent water from running down / dripping clear of the base.
  35. J

    Rendering below dpc

    Agree no point to using a stop bead at dpc line.
  36. J

    Rendering below dpc

    The usual way as said above, is to fit a bellcast beading at the dpc line to prevent bridging issues.
  37. J

    Patch Rendering, any tips?

    If l were you, bagged render, just add water, the finer sand makes it easier to achieve a good finish.
  38. J

    Renovating an old stone cottage

    Personally l would ditch the tanking as it prevents evaporation, you can also get water vapour passing through plaster and condensing on the face of tanking.
  39. J

    Renovating an old stone cottage

    Ideally l think you should if possiably to reduce the ground level and install a land drainage system to prevent dampness. The problem that l have experienced in the past with using s&c and tanking in this situation is that it will slow down/ prevent evaporation and can cause a chimney effect in...
  40. J

    Renovating an old stone cottage

    Interested to establish the height of the external ground level in relation to the floor level. To state back wall is 600mm below ground is not giving that information. As the mention of tanking by the OP may suggest high ground levels, lateral and or penetrating damp issues.
  41. J

    Renovating an old stone cottage

    Insulated dry lining system for walls. Ensuring external ground level is at least 150mm below floor level. What is the floor make-up?.
  42. J

    Rogers Rant

    In areas of high weather exposure, specifies need to look at all weathering details, no point in specifing a particular so called maintenance free render system if in 5 years or less it’s going to look like a load of crap.
  43. J

    External render disintegrated at bottom of wall

    No amount of Thompson’s will prevent water penetrating that wall and it’ll breath better without it.
  44. J

    External render disintegrated at bottom of wall

    And trap the moisture within the wall and prevent evaporation occurring. Best stear away from that type of coating, just my opinion.
  45. J

    Wallpapering over damp patches

    So the damp may be from rain descending down the flue (if the chimney head has not already been removed). Condensation in the flue and or salts from the burning of fossil fuels in the past. Some salts can absorbe moisture from a damp atmosphere and liquify on the surface of a wall, causing...
  46. J

    Hack of and Re-render, new render showing small cracks.

    1:1:3. As said above , strong mix for porous stone. Shrinkage cracks.?
  47. J

    Wallpapering over damp patches

    Good call. If the damp spots are the result of cold bridging you could expect some black spotted mould. If from another source you may find white salt crystals where moisture has been evaporating leaving the salts on the surface. Hope this helps.
  48. J

    Wallpapering over damp patches

    Struggling a bit with this one, damp spots on the upper half of the wall only ,as it seems, if it was due to cold bridging, you would expect more Evidence on the lower part of the wall where it’s generally colder, and closer to the corner where there is a lot less air movement.
  49. J

    Mixing SBR and PVA together

    Ratio depends largely on background, the more porous the higher the water content and coats, dense backgrounds such as concrete l would use it neat.
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