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Thermal Imaging Part 5: The influence of atmospheric conditions

Thermal Imaging Part 5: The influence of atmospheric conditions

Let's look at the influence of atmospheric conditions on thermal imaging surveying. After tech & science, colours, price and company selection, the last episode in our educational series tackles a favourite subject in the British psyche: the weather.

Thermal imaging or infrared  surveys are a hi-tech solution to building surveys. They really do move the game on from traditional methods of surveyors with clipboards or tablets relying upon decades of experience, but they are not infallible. Where a surveyor can survey in all weathers, infrared thermal imaging (IRT) is a bit more sensitive to moisture, temperature and humidity.

The influence of atmospheric conditions on IRT surveys

As you are ostensibly taking a picture of energy radiating from an object it makes sense that you don’t want anything to interfere with that radiation.  Although the word "radiation" may make you raise your eyebrows, it is all safe. If you have nice dry homes, with the heating on, the sun set two hours ago, it hasn’t rained that day, there is little wind, no fog or mist, then you can survey away and you will get awesome results.

The best atmospheric conditions for thermal imaging surveying are: after sunset, little wind, no rain, fog nor mist, and the heating on inside the houses.

Changing atmospheric conditions

Even with the current excellent weather forecasting capabilities, the best atmospheric conditions are often unpredictable. What can happen and how does it affect IRT surveys?

  • Turn up the wind however and all that lovely radiating energy will be blown from the surface you are trying to measure. Poop.
  • Wet the surface and double poop. The water cools the surface and absorbs the energy, then radiates it but with a different emissivity to the dry bits.
  • Switch the heating off and you lose the difference between inside and outside. As a result, the energy has no incentive to move, so your thermal imaging surveying results will be poor. You will think the building is perfect.
    Think about sitting in your lounge nice and cosy; the door to the cold hall gets open and suddenly the lounge feels cold. Why is that? That is due to the large difference in temperature, the heat cannot wait to leave and warm up the hall. Keep them both at the same temperature and you won’t experience this effect.
    Another example: Take your cup of hot coffee outside on a cold day. It will get cold fast!
    Your house is the same. The laws of physics and thermodynamics remain.

Rain and humidity in general are real no-no’s for a professional thermographer.

Educating clients on thermal imaging surveying technology

As IRT surveys, we conduct Continuous Personal Development (CPD) seminars up and down the UK every week for building surveyors raising awareness of the technology, its benefits and the optimal conditions to use it. We often ask people to think of their buildings inhaling and exhaling energy. To conduct an accurate defect or energy audit we need the building to inhale energy from the sun or your heating system, wait for it to absorb the energy then exhale. An infrared thermal image is an image of that energy being exhaled (or emitted). We can use big words, like thermal inversion, but we find it is better to use plain English in our communications and reports alike.

If you need to commission a survey to detect energy deficiencies of for your house stock or inspect your flat roof, do your research and choose a thermal imaging company wisely.

Once you have appointed your thermal imaging surveyor and they turn up to survey during daylight, rain or high wind , please protect your property and financial assets: get rid of them there and then. Contact us by clicking on the button below.

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Budgeting for your IRT surveying services

Budgeting for your IRT surveying services

 

After careful consideration, you have decided to go ahead and commission an IRT survey. Now you are turning towards budgeting for it. Here we provide you with the information you need to unlock the finances and place your order.

We have already discussed what is included in the price of an IRT survey. Let's look at it again and explain the value of the elements comprising IRT surveys services.

The price of infrared cameras

Back in the 1980’s cameras were the preserve of universities. They cost close to £250,000 and you had to be kitted out with the car battery to power it, liquid nitrogen on your back to keep it cool, periscope to look through, VHS to record video footage and a hand held sensor.

Fast forward to the millennium, cameras were £40K, hand held, digital, un-cooled and offered a truly portable solution.

By 2010 the same camera technology was closer to £10K, more ergonomic, lighter, sleeker, had more features, in some cases higher resolution and were being integrated into the main stream.

Today,  the same camera is 50% less at around £5-6K – but a myriad of low end cameras have been introduced to the market place. You can spend less than £1,000 and get a piece of a high-performing equipment.

But just because you can – should you?

The price of expertly using the technology

Owning a camera does not make you a photographer. In all likelihood you are reading this and have an impressive camera on your desk, would you therefore describe yourself as a photographer on your LinkedIN profile? The same can be said for low end IRT cameras.

For the plumber and electricians out there having an IRT camera in the toolbox will be as everyday as their screwdriver and spanners, the tech will save them hours hunting for overheating cables and leaking pipework.

There will always be a market for consultants with high end equipment, providing a service to building owners and occupiers who regularly need the service. Clients who need to rely upon the advice in a court of law or to arrive at a cost-effective refurbishment solution for their portfolio. Those surveys can’t be done by low end IRT cameras. More than that though, they can’t be done at all by unskilled labour. You need to understand the physics going on within a building if you are to successfully survey it using IRT techniques.

You can buy a camera for less than a survey these days, but you need to carefully consider the hidden elements such as software, training, calibration, insurance and most importantly – liability. That’s without mentioning health and safety. As an asset manager, would you sleep at night if, using a £500 camera, you advise a client to rip off his roof and spend £500,000 to refit based on your advice?

How much are IRT surveys services for an asset manager?

At IRT surveys, thanks to the unique way we have grown across the country we are able to offer uniform pricing. From Inverness to Plymouth a survey costs the same. The service, speed and cameras are the same. The surveyors have undergone the same training regime. The cameras are FLIR and all are annually calibrated. Every office is insured to the same level.

Most critically of all, the reports are written centrally by qualified analysts who do nothing other than analyse images.

We charge our services at £1200 for surveying time on one site and £650 for office time. We don’t add anything to those prices. No mileage. No expenses. No hidden anything.

This flat pricing structure means you can budget for the survey accordingly and build it into your bill of quantities at an early stage.

Need to survey the roof of a building? One site and one office day. Simple.
Want to add the walls whilst we are there? Thank you – it adds £650.
You would like to quantify the images for energy loss? No problem – it adds… you guess it: £650.

The pricing model also allows us an economy of scale if you wish to survey multiple buildings. The same rules apply.

How much are IRT surveys services for a housing stock manager?

The same level of expertise and diligence applies as for built asset surveying.

Pricing for a housing stock is more complex as it depends on the size of a housing stock and the breadth of services required.

However, for budgetary purposes for you as a housing stock manager in a local authority or housing association, prices start at £20 per house. Pricing are based on the volume of houses, the level of surveying and the data exploitation thereafter using  our bespoke software.

Should you want to discuss your IRT surveying requirements, please contact us  by clicking on the button below.

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