hi there so they were looking at practical workshop on new value calculations specifically for a given wall so you can do this for any materials you just got to follow the process the process being using the u-value formula so new value is basically two transmittance of heat allowing for how much heat goes through a material given the depth of the material the resistance of material etc hence the reason that we need to know the resistance of each material so down at the bottom here I have the resistance of outside inside and air gap so I've been given the surface resistances and the air gap resistances for my materials however and I've not been given limited the resistances for the bricks to blocks all the pasta because they are a given depth so I need to work them out so there's a resistance there's no problem done written those down lovely what about the actual materials brickwork quick well if I have got the conductivity of them I can work out the resistance because conductivity is effectively the transference of heat and however it's not given a depth it's what's per meter Kelvin or meter degree Celsius depending about that in a minute and so given the conductivity I can work out the resistance by inversing it and then timesing it by its depth so that is effectively what I've done here I've used that formula I've worked out the resistance for each material just using that simple formula easy okay so then I move on and I now I've got all the resistances of all the materials I can add them all together and I can put them into my lovely 'value formula here and so I have my u value 1.49 watts per meter squared I put degrees Celsius and because that's what I'm measuring in on this wall okay and I've also got an app here which is the thermal transmittance we're looking at the U value there's an app which can help work it out as long as you've got the right information in there lots of manufacturers this is Kingston and loads of manufacturers have their own evaluation so you can work out using their materials of what you what your wall would be all your materials would be just a little note on that the one degree K or degree Celsius because we're talking about transmittance of heat and it doesn't matter which value use in there so I've got up here meter squared K over what and then down here I've got weight meter square degree Celsius as long as using the same values as always say just make sure you start with the same thing as long as if you're using degrees Celsius usual temperature are you using Kelvin as your temperatures make sure that's that's the same but the actual value so the U value and will not matter if you've got degree Celsius or degrees Kelvin as long as whichever heat value you're using is the same you'll be fine with that okay and and then very quickly just looking at this concept we have the regulations now very important always to check the regs because they do change this part l-1b proof document is 2018 and l1 a is 2016 l1 b is for existing tilings and l18 is for new dwellings so if you have a look the wall is different not 0.28 is you minimum for that and not point three is your minimum for that one so just be very aware that I've got sorry he I have cut calculated you values of elements here some of them meet the regs and some of them don't just be aware of that okay so thanks for your time okay I know