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What looks like damp on interior dwarf walls of conservatory
Our conservatory was built onto the kitchen7 yrs ago and has a set of patio doors which separates both rooms. We have in the past week redecorated the inner dwarf walls of the conservatory and after very heavy rain we noticed the next day what looked like damp patches around the walls mainly in the middle, this has never happened before. The conservatory gets very cold in the winter as there is no radiator in there although we do use an electric Delonghi radiator to warm it up which is adequate. We thought it might be something in the paint so put another coat of paint on the walls and the same thing happened again today after some rain although not heavy. We opened the patio doors into the conservatory and in a short while the circles of what looked like damp had disappeared
again. We have no idea why or what this is could this be condensation or damp in the dwarf walls, there is nothing on the lowest part of the wall where the skirting board is and nothing where the sill of the conservatory meets the wall. can anyone advise?
It sounds to me like you have a cavity tie problem.When the brickies build the walls they often drop the mortar down the cavity as the build is in progress.This mortar sometimes hits a cavity tie as it falls and can cause the water on the outer leaf of brickwork to travel across the mortar soaked cavity tie causing damp circular patches on the inside wall.It has probably not happened before because the brick perishes over time and soak s up to much water .The easiest way to stop this is to coat the outside brick work with thompsons silicone sealant which is applied by brush and bought from homebase or B& Q
Answered 15th Nov 2014