Timber Preservation in Richmond upon Thames

This is one of most common and discussed dampness found in building. In recent times, condensation is the most common form of dampness, however positive identification and the right corrective action for both is vital. Rising damp is simply referred to as the flow of water upwards and vertically through permeable wall structure, the water being gotten from the ground. The moisture rises via the capillaries or pores in the masonry, meaning that the masonry functions just like a wick. With rising damp, water rises through the mortar beds and through the bricks. The mortar forms the only continuous pathway for the moisture to rise up the wall. Even if a house is built from impervious bricks then moisture can still rise through the mortar beds, however if an impervious brick is incorporated then water will not rise even if the bricks happens to be quite porous. In other words, mortar beds are an integral element in the chemical treatment for rising damp.

The moisture coming from the ground features small quantity of soluble salt which includes nitrates, chlorides as well as sulphates. These are transmitted with the water up the wall and are deposited and left behind when the moisture evaporation when drying. After some time, the salts will slowly accumulate and form a salt band close to the peak height of the rising damp. Chlorides and sulphates absorb water from the environment. Overall, the higher the quantity of salts, the greater the absorption of moisture from the environment and even more so when under humid conditions. In other words, even if rising dampness has been controlled by the installation of damp proof course, these salts can still make the wall and any affected decorations to remain damp.

Wet rot simply refers to the decay of timber caused by high moisture levels. This natural decay occurs when the moisture content in timber is about 30 percent to 50 percent. This is opposing to dry rot which only occurs as a result of a lower moisture content of about 20 percent. Naturally, a fungus is attracted to very damp wood, which it feeds off and in turn, destroying it. There are a number of fungus types, however the most common type is Coniophora puteana (also referred to as cellar fungus). In general, wet rot is usually confined to a localised damp area and does not spread which makes it a lot less destructive when compared to dry rot. However, if left untreated or totally ignored, wet rot can be just as destructive as dry rot and can greatly reduce the structural strength of the timber thereby causing a major structural damage in the process. So, what causes wet rot? Let’s take a look!

First and foremost, it must be stated that wet rot would be non-existent without a damp area to grow and thrive as wet spores are attracted to wet timber with a high level of moisture content. This moisture can be as a result of a number of issues which includes defective plumbing, leaking gutters, leaking roof, broken pipes, leaking washing machine or a leaking shower tray or bath. When the moisture a timber is exposed to is excessive, this offer the perfect environment for the growth of wet rot as it enables fungal spores to germinate and grow. They use the wet timber as a food source and eat it away, leading to a weakened wood and a compromised structural integrity.

Black mould, just like every other type of mould, is commonly present in dark and humid areas of homes and structures. Basically, it releases spores into the air which can be absorbed when you breathe in or through your skin. These spores are also able to get a ride on your body to other areas and gradually, spread throughout the home or house. Black mould is very different from other common household moulds, but it has a reputation for being toxic. In fact, a lot of individuals refer to black mould simply as toxic mould due to its reputation. When left untreated or totally ignored, black mould can result in serious health challenges and even more so for more vulnerable individuals. Respiratory issues are the most common health issues that arises as a result of black mould. You may start to cough, sneeze or even develop an itchy throat after a prolonged exposure to the toxic black mould spores. Vulnerable people or people at higher risk such as infants or an individual with respiratory challenges, could suffer long term health challenges. So, what are the signs of mould? Let’s take a look!

The most effective approach to reduce the risk of breathing in black mould spores is by eradicating it immediately you notice it. You may have a black mould issues if you notice:

• A musty smell. Luckily, mould has a unique and distinct smell which is often described as musty and earthy. It may even smell just like rotten vegetables or plants.
• Growth spots of different colours. Just like the name implies, black mould is often dark in colour. If you notice circular spots that are black, dark green or dark brown, then you probably have black mould in your house.
• Water damage spots. To detect black mould early on, simply look for water damage spots.

The most serious form of fungal decay is dry rot which occurs when the moisture levels of a timber is about 20 percent. It targets timber in buildings and feeds off the part of the wood which gives it its strength.it is able to produce moisture through the digestion of timber and as a result, does not require any source of moisture to spread. Once the dry rot is able to spread, it can severely impact and compromise the structural integrity of the house or building. If you think you may have dry rot on your building, the best solution would be to call on a professional to conduct a survey of your premises and have it treated as soon as possible if positive. If the dry rot is not identified and treated as soon as possible, you may have to remove and replace all the affected timber later on. In this post, we’re going to take you through the process of treating dry rot by yourself. Let’s take a look!

• The initial treatment stage of dry rot is to identify the moisture source and have it repaired. Once done, you’ll have to ascertain the full extent of the dry rot outbreak. To achieve this, simply open up the affected area by removing the plaster and render in all directions while also removing flooring and lifting floorboards. Once done, you should be in the best position to determine the full extent of the infected timbers.
• Proceed to cutback the timbers in-situ to a minimum of 500mm beyond the last signs of fungal growth or the strands of hyphae.
• Remove all fruiting bodies and detectible spores. Clean the wall areas to eradicate surface growth using a stiff brush if necessary.
• Replace the timber with pre-treated timber.
• Treat the new and old timber with a dual purpose dry rot treatment fluid and sterilise the masonry.