Wet patches on render

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    Wet patches on render

    Hi

    I was wondering if anybody had an idea what might be causing the water patches on the render, please see picture?

    There seems to be no evidence of damp/mould or smell internally.

    The house is 1930s build.

    Cheers

    Robert
    Attached Files

    #2
    Is this recent, does it happen often, is it only obvious after very heavy rain driving onto that wall??

    What about the other walls??

    Any damp/mould inside anywhere??

    Heating & ventilation OK??

    When was render done (is next door different)?
    I am legally unqualified: If you need to rely on advice check it with a suitable authority - eg a solicitor specialising in landlord/tenant law...

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      #3
      We've had a lot of driving rain this week. Have you noticed this for long?

      Comment


        #4
        I haven't actually acquired the house yet, however the first time I viewed the house it was raining and no patches. The 2nd time I visited it wasn't raining but patches were visible(when the picture was taken).

        This only seems to be affecting the front facing wall. It is the only house on the street which is rendered. It appears that cavity wall insulation has been fitted recently. I am unsure as to when the render was installed but you can see that some of the brick infills above the window have fallen away and there is a very thin coat of render applied.

        Internally the house is well heated and ventilated and there is no evidence of mould growth/damp patches or odour.

        Comment


          #5
          theartfullodger,

          I haven't actually acquired the house yet, however the first time I viewed the house it was raining and no patches. The 2nd time I visited it wasn't raining but patches were visible(when the picture was taken).

          This only seems to be affecting the front facing wall. It is the only house on the street which is rendered. It appears that cavity wall insulation has been fitted recently. I am unsure as to when the render was installed but you can see that some of the brick infills above the window have fallen away and there is a very thin coat of render applied.

          Internally the house is well heated and ventilated and there is no evidence of mould growth/damp patches or odour.

          Comment


            #6
            If you haven't acquired the house yet and are worried already, might I suggest that leave it alone is the best option.

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              #7
              Originally posted by andybenw View Post
              If you haven't acquired the house yet and are worried already, might I suggest that leave it alone is the best option.
              Cheers for your helpful response andy.

              I should complete on the house in the next couple of weeks and I wouldn't say I am worried, just curious to see if anyone could give any possible clue as to the cause of the defect as its something I have not come across before.

              Comment


                #8
                Has the house been unoccupied for some time? This might explain why the rain water has not evaporated, plus also the new insulation would make that take longer.

                Comment


                  #9
                  What sort of cavity wall insulation was used? Ask the vendor for details of the job and contractor.

                  I find in damp situations graphite coated ball type stuff is the best. If the blown fibre (cheapest) stuff gets damp it just collapses in a lump in the cavity.



                  Freedom at the point of zero............

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                    #10
                    Cheers for the help guys, I have asked the vendor for more details, hopefully its nothing major.

                    You can also observe from the picture that the old brickwork sills are not protected and most of the patches are under them, could this be causing the ingress?

                    Comment


                      #11
                      From the photo, it looks as if the gutter could be blocked, and rain water overflowing. It would then splash down and hit the rendered wall below first floor windows.

                      The mark below the ground floor window must have a different cause - probablythe brick window sill of inadequate depth, covered with UPVC. There should be a groove under each window sill (can't remember its name) to prevent rainwater dripping straight on to the wall. This could apply to first floor windows too. Application of render to this house has probably filled up that groove.

                      With a rendered wall, water can get trapped behind the render, and will take a very long time to dry out.
                      What are those strange marks on the render - studs or nails which may be letting water penetrate?
                      Of course, rendering the wall is the last thing you want in this situation. Without render, the wall would dry out by evaporation from the brickwork (the "overcoat" effect).

                      Seems overall to be the result of some ill-advised home "improvement" or poor maintenance.

                      Things to find out
                      When were the gutters last cleared?
                      Do other houses in the street have the same UPVC window frames?

                      Also:
                      What did your survey say?

                      Good luck with this. In the long run, it may be simpler to get the render removed.

                      Comment


                        #12
                        I think the 'studs or nails' are the holes made to insert the cavity wall insulation and also there does not seem to be a lead tray under the bricks or between upvc cill and brick to prevent water ingress.



                        Freedom at the point of zero............

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