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About ADLIan

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  1. ADLIan

    Insulating Easijoists

    The amount of thermal bridging will be considerable; Series of 'metal fixings' penetrating the insulation layer which can be included in the U-value calclation Possibly no insulation in the depth of the joist unless you risk loosing fingers pushing mineral wool in there before insulating between I'm surprised the insulation manufacturers cannot model this. Perhaps also an issue for the easijoist manufacturer to look into this in more detail.
  2. ADLIan

    Electric cables, conduit and eps

    There is no issue between EPS/XPS and RIGID PVC conduit or pipes. There is the well documented issue of pasticiser migration with FLEXIBLE PVC cable insulation. I'm sure cable needs to be derated too if ran in conduit in any insulation.
  3. Your energy assessor looks to have the correct U-value (comparing the 125mm PUR). To get the same U-value would require twice the thickness of the insulated screed product (0.022 W/mK vs 0.043 W/mK).
  4. ADLIan

    Insulation toxicity?

    What do they want the insulation testing for? Type of insulation? Correct installation? If done in late 1990s/early 2000s I doubt it will be urea formaldehyde based and I don’t think there are any health issues associated with it - mostly likely to be blown glass wool. Try contacting Cavity Insulation Guarantee Scheme ( google CIGA) they issue most guarantees for these systems and copies can be obtained. Other guarantee providers also possible so you may have to search around.
  5. ADLIan

    VCL for a warm flat roof

    You’re welcome.
  6. ADLIan

    VCL for a warm flat roof

    In a warm roof condensation may (will?) occur on the underside of the waterproof layer and BS 6229 gives maximum allowable winter build-up when assessing the condensation risk. The VCL should be taken up the sides of the insulation and onto the top of the insulation (or up any upstand) and sealed to the waterproof layer so that the insulation is encapsulated. See guidance from insulation or waterproofing manufacturers.
  7. Are you looking to just meet Building Regs or looking at a much better standard. The 100mm cavity makes things difficult but can work if you only want to scrape a pass. The 2 full fill options above will be expensive (especially phenolic foam as Kingspan have a virtual monopoly on this product!). Suggest you look at the SAP assessment numbers to see what is possible. I'm not convinced with any injected insulation in new build as there is no way of telling if there are missed areas or gaps. At least with built in you can see the quality of workmanship.
  8. ADLIan


    EPS will initially melt away from a heat source but ultimately it will burn fiercely with plenty of black smoke typical of most petrochemical based products. Try to set fire to a sheet positioned horizontally then do the same with sheet held vertically - the latter will give a very different outcome!
  9. There are 2 issues here; 1. Calculation of the floor U-value, as above, with little benefit from the vertical edge insulation in the calculation 2. The linear thermal bridge at the floor/wall junction (along with may others) which is an input into SAP 2012 (& 2009). Default and/or accredited psi-values are available for 'standard' details however these would penalise a 'non-standard' but well designed floor edge detail such as the JSH detail. With high levels of insulation poorly designed junctions can have a major impact on the SAP rating & Building Reg compliance.
  10. As stated the heat loss from a ground floor depends upon the size, shape, edge conditions and soil type. Best analogy I've heard is consider a ground floor like a bowl of hot soup - it will be cooler at the edges (=greater heat loss) and warmer at the center (less heat loss). This table from BR 443 may help - larger, square floors having a lower inherent U-value. With current levels of insulation in the general floor area (>100mm PUR or equivalent) vertical edge insulation has little effect on the overall U-value but is important to minimise the linear thermal bridge at the floor/wall junction (which is where BR 497 comes into play as guidance and standard conventions when using BS EN 10211).
  11. ADLIan


    Sorry but PIR will not create a cavity barrier (look at Grenfell Tower!) - needs to be mineral wool.
  12. ADLIan

    Water ingress under window

    Does the window sit on the Sarna membrane that continues from the outside flat roof to the inside? Are you then trying to weatherproof this detail using sealant? If this is the case this detail will always be a problem and I doubt complies with Sarna recommended detailing. Would normally expect the window to be sat on an upstand with the Sarna membrane dressed up the outside of this.
  13. Check loading with insulation manufacturer. Celotex (and probably other pur) is BBA approved for domestic type loadings only. XPS has higher compressive strength and often used in areas subject to vehicular access.
  14. ADLIan

    Cavity wall requirements around windows

    Is this new build in England? Probably OK returning the blockwork but leave space for a 50mm (min) insulated cavity closer - not ideal but will meet BR minimum requirement. Better to use 150mm insulated cavity closer and use bracket/cleat to fix window frame - may be much simpler to install too, saves a lot of time cutting and laying blocks around each reveal. Cavity closer manufacturer may offer values for linear thermal transmittance - enhanced values can be used in SAP which can be advantageous.
  15. +1 on above. I doubt the frame material has an impact on the acoustic performance. Acoustic performance depends mainly on number of panes, glass thickness (better with 2 or more different thicknesses), gap between the panes and addition of an acoustic absorber between the panes. Remember as soon as you open a window its acoustic performance reduces to zero!