We all know about the devastating effects that change in our climate will cause, from melting ice caps, rising sea levels and more extreme weather. But there is another risk too, and one that could potentially affect all of us in the way we build and look after our homes, and how we try to save the ones at risk.
One of the consequences of climate change that we are already seeing, and bearing witness to its effects, is changes in our weather. Namely, we are experiencing warmer and wetter winters along with warmer and drier summers. Amidst the plethora of changes this will cause, scientists are concerned about an increase in the severity of microbiological attacks of exposed timbers. This means that any type of wood used in construction could be more at risk to decay from mould and wood-rot fungi.
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Scientists use something called the Scheffer Climate Index to monitor temperature and rain variables, which can be used to indicate how preferable the conditions are for harmful mould and fungi to take effect. A recent study found that in the UK the value on the Scheffer index is likely to increase due to climate change, meaning that there is a greater risk of timber being attacked by a variety of organisms such as with decay-causing fungi and moulds creating a major source of economic loss, and potentially damaging some of our most valuable and historic buildings.
One of the immediate ways in which we are going to have to address this issue is in the higher maintenance costs. Damaged wood is not only unsightly, but it can result in the structural integrity of a building becoming compromised, so replacing or treating any damaged timbers before they get to that point is crucial.
Moreover, some of our most historic buildings, for which wood was a primary construction material, will require additional maintenance and care to ensure that future generations can enjoy them. Specialist care may be required owing to the age of the timbers, and their susceptibility to being water damaged irreparably.
But it is not just old buildings that need to be taken into account. It is estimated that the average newly-built American new home contains 22 fully grown pine trees worth of timber within them. Across the world, timber is still one of the primary materials used in house construction, which fuels the ever-increasing rates of forest destruction, further harming the climate and raising the Scheffer index. It’s a vicious cycle and one that will take immense amounts of change and oversight to overcome.
One of the immediate things we can do is increase the scrutiny on building designs, making sure they are future proof and take into account using durable and responsibly sourced timber, while also increasing research on effective and appropriate wood protection strategies, including wood treatments or wood modifications.
So, what do you need to look out for in your own home? Some of the telltale signs are:
1. Sagging of ceiling linings
2. Corrosion of fixings
3. Uneven floor surfaces
4. Mould or fungi
5. Musty smells
6. Swollen materials such as skirtings and architraves
7. Staining or discolouration of materials or surfaces
8. Staining and rotting of carpets, or rusting of carpet fixings.
It is vital to maintain potential problematic areas, especially timber, and this can only be done by knowing what to look out for, testing and inspecting. Specialist microbiologists can be brought in to assess fungal decay of framing timbers and truss. This can be used to prove whether or not there is a health risk posed by the fungi that colonize water damaged timbers in addition to the potential for wood rot decay.
Hi there. What are your first thoughts when I mention the word climate change? Do you agree with it or do you step outside your front door and you think to yourself spring and summer, it's not just as pleasant as when you were perhaps a child? Well, these extreme weather events, think of bush fires or extreme water events, this encapsulates the concept of climate change, and we all know the famous Swedish environmental climate activist, Greta Thunberg, presented her famous series of speeches in 2018 and '19 talking about the dire impact of climate change if we don't do something about it.
So that brings me to what we're going to be talking about in this week's live stream, and this is some of the impacts of extreme weather events that can affect our homes and cause damage in particular to timber and timber incorporated into not only new building construction but all sorts of different environments where timber is used. The jumping-off point for me deciding to talk about this week is this wonderful paper which came out at the beginning of October talking about the impact of extreme weather events on timber, and the reason I thought that this would be a very good topic to focus on is not a week goes by without someone ringing me up to say, "Help, my new home construction, all the timber framing or truss is showing lots of examples of mold and weathering."
Oftentimes, people tell me that they have consulted with their builder and the builder has gone to the timber industry and the timber industry has come back saying, "No, you don't have to be worried about that. That is just staining of the timber, and unless it's caused structural decay of the frame or truss, it's nothing to worry about." Well, I'm here to say that that is absolute nonsense and doesn't have any scientific credibility. Yes, I appreciate the brown and white rot fungi are those fungi that cause structural decay, but the very presence of other types of mold on your built framing is a serious health concern and we're going to be going through some of these today.
As well, I'm going to be talking about the eight areas of a home that you need to look out for to monitor for the impact of climate change all around your home. Now, the topic of today is, is climate change damaging your home? What are we talking about here? Well, we're talking essentially about warmer and wetter environments, that is warmer climate and wetter climate and then drier summers. To kick this off, I'm going to drill into that academic paper that came out at the beginning of October which puts all of this into some perspective.
To start this, we're talking about warmer weather winters, warmer dryer summers, which are a significant consequence of climate change. What the academic scientists are saying is that this change to the climate means that there is an increase in the severity of microbiological attack of exposed timbers, and what this means is that this affects not only new home construction, but homes that have already been constructed. The International Energy Agency has also stated that over the next 40 years, there are 230 billion square meters of new buildings predicted to be built, and this has an area of the size of Paris being added every single week.
Now, just think about it, the area the size of Paris in new building constructed over the next 40 years. That's a lot of potential for sick building syndrome to occur to be associated with some of these dwellings. I want to show you how you can protect yourself, but I want to get back to something called the Scheffer index in this particular research, because it applies worldwide, and this Scheffer climate index is a measure of how the monthly rain relates to temperature, and the British researchers have done the Scheffer index for the United Kingdom, but I wanted to show it for Australia.
What we can see is that at coastal areas, right around in the blue and green areas, these are those areas which show significant rain and temperature shifts, and this allows us in a sense to predict those areas of Australia that are more probable going to have a decay index associated with them. We have to respect the fact that as there is an increasing risk of climate change, this is going to lead to more rapid potential decay of all types of building elements, but particularly timber building elements, and so we can now look at some other aspects of the research as well and we have to look at the fact that climate risk results in faster rates of timber decay, which of course could lead to serious economic loss.
So these are the implications of climate change. Obviously, depreciation in asset value of buildings and there may need to be replacement due to safety or aesthetic concerns, and of course, there could be a loss of wooden cultural artifacts. Now, what can we actually look at for in terms of potential solutions to climate change? Well, we need to put an increased effort into examining and assessing building designs to minimize the impact of water damage on the built environment. We also need to make better choices about more durable woods used in construction. Most importantly, we need effective wood preservation and preventative strategies, especially when timber framing has become mold affected.
We can't just cover it up with plasterboard and new paint and say the problem's hidden, it's not there, don't worry about it. Brown and white-rot fungi weren't there. It hasn't decayed significantly enough to damage the structural integrity. That's just not true. We know from the World Health Organization 2009 publication that mold affects respiratory health and increasingly we see that mold affects immune status as well. So of course, building mold into a building is just a bad idea. But if we go back to this slide, we can see a hazard map of Australia for timber under the influence of decay fungi, and this is from Allied Research from the timber industry itself, and remarkably, you can see that the graph of the predicted fungal timber decay and the Scheffer index overlaps quite significantly.
Now, I also want to now tell you the eight areas that you should be looking at and point out some typical examples of building elements and areas in a property that you must be regularly monitoring and investigating. So this is the eight-point visual inspection checklist for what's generally termed leaky building syndrome. So look out for sagging of ceiling linings. Check for corrosion of fixings and fittings, and if you've got carpet and you think it's damp or you use a moisture meter and prove that it's damp, well, check the carpet grippers to see if they're rusting. That is an example of corrosion.
Uneven floor surfaces are a dead giveaway that there are water problems, and that again, if climate change is leading to increased levels of rain, that's going to lift floors. Obviously, look out for visible evidence of mold or fungi or evidence of mold being a musty smell. Look for swollen architraves or skirting boards, and of course, staining or discoloration of surfaces, including damage or efflorescence coming out of concrete flooring, and look for staining and rotting of carpets.
Typical areas where to look in a property are any flat roofs or roofs that have concealed guttering. Concealed plumbing is a problem in flat roofs and it leads to a build-up of water that may not be able to escape adequately. Examine the flashings around windows. Of course, decks over living areas are a big problem, as are decking and outdoor areas in apartments with planter boxes built into them. Oftentimes, water can't escape properly and then percolates through downstairs. Another problem that you must be aware of is any ground floor home or apartment where the ground level outside is higher than inside could be a big problem. So the solution here is to inspect, assess, and monitor for better buildings.
But you're probably thinking checklists are great, but what happens when I actually have a problem? You might have a dispute. You might need to prove to someone that some of the timber building elements within your property are actually decaying. Well, that's when companies like mine come into play and you can use things like tape lifts. Even if we're too far from you, you can purchase type lifts and you can have these used. I'm going to show you exactly what this looks like for a property that I inspected earlier in the week. If I go to this now, this particular timber reveal in a apartment had been leaking from the upstairs deck planter box.
Now, the issue here is when we use these tape lifts to apply them to the surface, you can actually see that I've got a small microscope image of what this tape lift looks like, and you can see it's pulled off some of the wood, which has shown up in black, but at magnification, you can see all of those mold spores and that really is a big problem because those mold spores easily become airborne and are a serious respiratory health risk and also can cross-contaminate a home very easily and that is something that we just don't want.
So I hope today has shown you the potential impact of climate change and shown you that it can affect everyone and that is quite a serious consequence of fluctuations in rainfall and temperature. In any case, my name is Dr. Cameron Jones. I'd encourage you to follow and subscribe to any of my social channels by using @drcameronjones. In any case, have a great week. I'll see you next week. Bye for now.