花园墙潮湿可能是原因,当潮湿可能穿过墙并深入问题区时,气砖会在地板下喷出疑点,除非水流出水面导致潮湿上升。如果花园墙比你现有的潮湿高点,墙上可能需要我问题和潮湿原因

Sounds like the damp is definetely penetrating from the outside, you mentioned the plaster behind the radiator and under the window is powdery and crumbly, if i was a betting man i would bet that this area of the wall has been plastered with 'bonding' plaster or a similar backing coat plaster , usually in a pink or brownish colour, it's Notorious for not being waterproof and holds water just like a sponge, it's not meant to be applied to exterior walls within a house, it sounds like it's acting like a wick for any moisture that maybe from outside.灰灰灰石膏约10-20毫米厚粉红或褐色后,用锤子和锯子切回砖厂,必要时去除散热器-再找石膏机用沙和水泥换防水添加剂或沙石灰顶部用薄粘贴板正常化 经验中不必加潮湿证明课程