uPVC or Aluminium Windows? How to Choose the Right One
A practical comparison of uPVC and thermally broken aluminium windows: insulation, profiles, colours, large openings, maintenance and when each makes sense.
Standards and documents
Declaration of Performance (DoP) and CE Marking: How to Read Them
What DoP and CE are
The European standard EN 14351-1 sets requirements for external pedestrian doors and windows. The manufacturer issues a Declaration of Performance with the product values and affixes the CE marking under Regulation (EU) No 305/2011.
What values it contains
It typically includes, among others:
- Uw: thermal transmittance of the window;
- Rw: sound insulation;
- air permeability;
- water tightness;
- resistance to wind load.
How to use it
- Compare only values from the DoP, not from brochures or verbal promises.
- Make sure the document refers to the system and configuration you are ordering.
- For projects with an architect or institutions, the document is often used for specification.
Which documents you get from Apex Frames
At handover you receive the manufacturer’s DoP and CE marking, the warranty certificate and the maintenance guide, together with the handover protocol.
Common mistakes with documents
- The document doesn’t refer to the system and configuration you are ordering.
- Confusing the Ug value (glass only) with Uw (the whole window).
- Accepting verbal promises instead of a written document.
Frequently asked questions
Does Apex Frames provide a DoP?
Yes. Products come with the manufacturer’s Declaration of Performance and CE marking, and you can request them at quote stage.
What is Uw?
The thermal transmittance coefficient of the whole window. The lower the value, the less heat is lost.
Who issues the Declaration of Performance?
The system manufacturer issues the DoP and affixes the CE marking, under EN 14351-1 and Regulation (EU) 305/2011.
Where do I get the DoP for my order?
You can request it at quote stage; at handover you receive it with the warranty certificate and the maintenance guide.
