How to match thermal conductivity in a Polish specification to an overseas insulation quotation

Copy one complete requirement into the comparison, including its symbol, unit and any inequality sign. “No more than” does not mean “exactly equal to”. Also record whether the requirement is for the material, an insulation layer or the finished building element.

The Polish phrase „deklarowana przewodność cieplna” corresponds to declared thermal conductivity. In a German document, look for Nennwert der Wärmeleitfähigkeit and the symbol λD, then check the document key. The word conductivity or Wärmeleitfähigkeit on its own does not identify the kind of value.

Reserve a separate field for the Polish „obliczeniowa przewodność cieplna”: design thermal conductivity in English or Bemessungswert der Wärmeleitfähigkeit in German. If one field is empty, do not fill it by copying the other. The blank identifies the information that is still needed.

Suppose the design requires a design conductivity no greater than 0.024 W/(m·K). The overseas quotation reads “λD 0.024 W/(m·K)”, while the Polish drawing uses a decimal comma. Both decimal marks denote the same number here. It is the property qualifier, not the punctuation, that makes the difference.

Record the outcome as “declared value supplied; design value for this project unconfirmed”. At this point there is no basis for either confirming compliance or rejecting the product. The missing step is to establish which value applies in the proposed use.

A concise English enquiry is: “Does the quoted figure refer to declared or design thermal conductivity? Please identify the product and the supporting document.” Attach the relevant specification line and state the intended use so that the reply cannot easily be mistaken for advice on a different board.

In German, ask: “Ist die angegebene Zahl der Nennwert oder der Bemessungswert der Wärmeleitfähigkeit? Bitte nennen Sie die Produktbezeichnung und die zugehörige Unterlage.” If the supplier can only confirm the manufacturer’s declaration, refer the design value to the project designer.

File the reply under the quotation line, product thickness and offer date. Keep a document for a board with another facing as a separate attachment unless its scope is confirmed to include both models. A similar trade name is no substitute for a product identifier.

In a bilingual schedule, keep the source wording in one column and the agreed translation next to it. Carry λD and its unit alongside the number. Switching the catalogue language then preserves the fact that the value was declared.

At approval, note who selected the design input and where it came from. Do not translate “documentation accepted” as “product meets all requirements” if only thermal conductivity was reviewed. The wording should reflect the actual scope of the check.

If a revised quotation names a substitute, recheck the identifier and declaration even when the conductivity figure has not changed. This keeps the approval tied to the product that was actually assessed rather than to a later entry with a similar description.