Architect’s Outline Specification - how closely does this need to be followed?

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Hi, just looking for some advice on something. I’m getting a sunroom/extension built at the back of my house and noticed the builders are using 120 mm thick Kingspan floor insulation boards (TP10/TF70/TW55) whilst the Architect’s Outline Specification states that it should be 150 mm thick Kingspan K103 (so thicker and generally higher quality too I believe). I asked about this and the Architect himself has told me that using 120 mm is still compliant. I’m just a bit concerned that if they are not following the spec what else could go wrong with the build, how closely are they required to follow the Outline Specification before they are breaching some regulations?

I’m located in Scotland.

Thanks
 
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Builders should follow the specification implicitly, and only change things with your prior approval.

Obviously they have used a cheaper/inferior insulation, and whilst it may still perform to the required standard, they should reimburse the costs of the cheaper product.

They have priced the work based on the drawings and specification, remember that always. They may then look to substitute products to their advantage not yours.
 
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Thanks, interestingly the Architect’s drawings show 120 mm boards but his spec says 150 mm.
 
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Thanks, interestingly the Architect’s drawings show 120 mm boards but his spec says 150 mm.
OK that's poor specifying by the designer. He's probably just cut and pasted his last job and not properly checked things.

Typically the drawing is referred to by the builders, rather than any separate text document. So strictly whilst a contractor should check and cross reference all documents and clarify errors and omissions, it's common and understandable for just the drawing to be followed.

Perhaps you now need to check confirm that all documents contain the same details.
 
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120mm (currently) is the more realistic figure.
It's an architects 'oath' to ensure the build is carried out as economically efficiently as possible. If 120mm cuts the mustard....
 

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