If a room is drafty, the cold air from outside can enter and cause your floors to be cold. An excellent move is to insulate the ceiling. Done properly, cavity wall insulation can give huge benefits, mostly in the form of a warmer home and lower energy bills. Because basement walls are in contact with the soil and soil temperature several feet below the surface remain at a constant temperature of 60 degrees or less, basement walls and floors tend to remain cool. In addition, they put a vent in the bathroom, on the floor, directly under the door when the door is open. If you want to design and install a duct system to create problems, the possibilities are endless. We tend to use the cream DPC formulation made by Property Repair Systems. If your chimney pots are capped, you should replace the caps with cowls – these are ventilated caps that don’t allow rain to enter but still allow air to enter and leave. Any damp underneath will need to be dried out and then the wall’s surface treated as needed with a salt neutraliser if salts are present. The fact that the salt deposits are penetrating the wall could also indicate a leak, so you will also have to check any open chimney pots to ensure moisture is not getting in here and also cracked mortar, broken tiles, damaged flashing etc. Cold pour joints in concrete, defined here, … This insulating effect makes them feel warm to touch and reduces heat loss, in turn reducing demand for heating and saving you money on your energy bills during the autumn and winter months. In fact, as we improve the insulation and airtightness of our buildings to make them more energy efficient, an unintended consequence is that we reduce ventilation and limit the property’s ability to ‘breathe’. Once you confirmed you do in fact have a leak, you'll need to identify the source. Moisture will condense on other cool surfaces, particularly adjoining wall surfaces and even ceilings. Any damaged or spalling bricks will also need replacing. If you need any help finding the cause of the cold spots on your walls and curing them, please contact Property Repair Systems on 01626 872 650 and they will be happy to help with any damp issues you may have. Prolonged periods of condensation can lead to the formation of black mould and a multitude of potential health impacts from itching eyes to breathing issues including asthma and even the lung disease Allergic Aspergillosis. They have the vents on the floor along the outside walls and the cold air returns neat the ceiling on the wall perpendicular to the vents. the walls of your rooms inside the house. If it’s sound, then you are okay to treat your wall with salt neutraliser. This issue can be more prevalent if you have capped chimney pots or blocked up fire openings that themselves have not had suitable ventilation installed. If the cavity is not filled to the correct height etc… and gaps are left in the fill then this can cause temperature variations and cold spots in your walls, which as we have outlined previously can cause condensation, mould growth, hygroscopic salts, damp spots and other issues. With the ventilation issues sorted you will have to dry the damaged area out properly – this may take some time. In addition, install or replace the weatherstripping around your doors and windows. This is not necessarily the best way to do things but it does happen. Again, this attracts moisture which condenses on the damp spot to make the situation worse. Concrete foundation cold pour joints: this article describes the appearance, cause, & problems that may occur at cold pour joints in concrete foundation walls and occasionally floors or ceilings. There is always a risk that the cold weather is going to cause problems. You can get a pre-mixed salt neutraliser and plaster mix or you can get salt neutraliser that you can add to the plaster mix (as mentioned above). Take a look further down this page for fixes for different moisture sources. Some are accidental -- some on purpose, even code required -- some served a purpose at one time in history but because of the evolution of construction, are no longer useful -- some are wasteful -- and some can cause damage. The mineral deposits that build up on the inside of a chimney breast can seep through the wall and appear on the external chimney breast surface and create damage in the form of white and brown staining and salt buildup. We’re all taught not to run plumbing in exterior walls.. There are quite a few available on the market at present but the best salt neutraliser we’ve found is made by PRS – it produces consistently great results. 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