Architects insultation requirements?

[bobcongo]

Hello!

My architect has specified Kingspan TW55 and TP10 for my loft conversion.

Questions is, is there a cheaper alternative and if so, will building regs care about if Architect has specified one brand and I install another?

 

[freddiemercurystwin]

BC will accept any kind of PIR, there may be some slight variations with the thermal conductivity across different brands so watch that. Ecotherm or Mannock and a few other brands exist.

 

[bobcongo]

BC will accept any kind of PIR, there may be some slight variations with the thermal conductivity across different brands so watch that. Ecotherm or Mannock and a few other brands exist.

Great, thanks! Assume therefore if Celotex is coming out cheaper than Ecotherm here, i go with Celotex? They're advising Ecotherm is a cheaper alternative to Kingspan - not sure why they're not advising Celotex unless i'm missing something?

Celotex XR4120 General Purpose PIR Insulation Board - 2400 X 1200 X 120mm | Insulation Superstore®

This Celotex XR4120 is a highly versatile multi-purpose insulation board ideal for various applications including pitched roofs, flat roofs, solid floors an...

www.insulationsuperstore.co.uk

EcoTherm Eco-Versal General Purpose Insulation - 2.4m x 1.2m x 120mm | Insulation Superstore®

EcoTherm Eco-Versal General Purpose Insulation - 2.4m x 1.2m x 120mm from EcoTherm. (PR120). Order Helpline ☎ 01752 692 206

www.insulationsuperstore.co.uk

 

[freddiemercurystwin]

Depends where you buy and if you can get a discount eg https://onlineinsulation-sales.com/...l-pir-insulation-board-2400x1200mm-2148-p.asp

 

[bobcongo]

On a related note, he's also specified gable end insulation of 140mm with "00mm TW55" - has he missed a digit there or does 00mm insulation exist?!

 

[freddiemercurystwin]

Seems like a typo, check with him.

 

[bobcongo]

Fired him. Will wait for building regs