JohnBishop Posted October 31, 2022 Share Posted October 31, 2022 Hi Everyone, I have these on the chimney part wall. When I knock on it it sounds hollow comparing to the plaster above. Should I just remove and put some new plaster? Is this penetrating dump from the ground or from the leaky chimney? Best regards Link to comment Share on other sites More sharing options...
markc Posted October 31, 2022 Share Posted October 31, 2022 (edited) Looks and sounds like damp walls and could well be a chimney leak. If the skirts are wet then you might as well pull it off especially if plaster has detached. As the patch looks quite even I would guess at water falling down a cavity and splashing rather than seepage through the wall. What’s on the other side? Edited October 31, 2022 by markc 1 Link to comment Share on other sites More sharing options...
JohnBishop Posted October 31, 2022 Author Share Posted October 31, 2022 On the other side it is neighbour's gas heater inside his chimney breast so not sure how does this look inside. The roof and chimney has been fixed now so there should be no more water getting in from above. Link to comment Share on other sites More sharing options...
Gus Potter Posted October 31, 2022 Share Posted October 31, 2022 3 hours ago, JohnBishop said: On the other side it is neighbour's gas heater inside his chimney breast so not sure how does this look inside. Safety first here for me. Now winter is coming can you smell any flue gasses. I would make a hole in the plaster where there is a void behind and put a CO detector there and monitor. You could also get a Gas Engineer to investigate with their gas analyser but the nighbour's fire would need to be on. Or you could ask your neighbour when they last had the fire serviced ect in passing. Remember that burnt gas contains water vapour that can condense if not properly controlled. If all the roof leaks have been fixed it could take a good few months for things to dry out.. but I would want to know more about the gas fire on the other side. Is the neighbour's old chimney lined with a flexible duct for example. Is the duct installed the right way up? Next would be to open up the wall more and look inside, then lift the floor locally and look under. Have a go at this and report back on BH and folk will give you ideas on what and where to look next to help diagnose the problem. 2 Link to comment Share on other sites More sharing options...
markc Posted October 31, 2022 Share Posted October 31, 2022 As above! If this isn’t an outside wall then extra caution is needed 1 Link to comment Share on other sites More sharing options...
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