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ADLIan

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  1. Not really the architect’s fault. Fault lies more with the insulation manufacturer for developing a system that needs this level of dimensional tolerance.
  2. That’s the very reason the building regs and successive Govts (and funding schemes) have not promoted AC - it increases energy use!!
  3. The old Rockwool trope of denser=better!! Lower density glass wool or stone wool would do the same job, fraction of the cost and easier to install. MF system, resilient bars and double layer plasterboard have bigger impact on acoustics.
  4. One of the insulation manufacturers (can’t remember which one) introduced a similar system, just with xps strips, quite few years ago. Was not a success and soon dropped!
  5. Cavity barrier may be required to separate any wall cavity from any roof cavity even in this instance. BCO interprets and enforces Regs so his call here.
  6. Units are wrong then. Should be W/mK.
  7. Numbers look right for conductivity in W/mK.
  8. U-vals are only quoted to 2 decimal places so still 0.18! Even if to 3 places a difference of 0.003 W/m2K is unlikely to impact overall energy assessment
  9. Save yourself a lot of money and use 035 mineral wool within the timber frame. Probably gives the same u-value as 032 product at fraction of the cost (15% timber frame fraction ‘degrades’ thermal performance of this layer).
  10. Psi-values are required as part of the SAP calculation input. The accredited construction details can no longer be used so option is to use default psi-values (which makes BR compliance very tough) or calculated psi-values (or mixture of both). There is lots of published data on masonry and timber frame psi-values - see trade associations, building product manufacturers. For non-standard construction such as SIP, insulated formwork, light steel frame etc bespoke calculations may be only option, they are complex and time consuming hence costly!
  11. Don’t like the idea of ventilating any cavity in a wall straight into the loft space due to the risk of fire spread
  12. That membrane look to be for pitched roofs. Doubt it would keep the water out on a flat roof hence your problem
  13. Knauf ecose is a binder not a blowing agent. It states ‘no added formaldehyde’ - does this mean totally formaldehyde free??
  14. Kingspan and ‘higher fire safety performance’ - words I never thought I’d see in the same sentence following the Grenfell Tower fire. All PUR foams burn.
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