Which window profiles to choose?

The window profile is the most important part of a window, because its thermal insulation properties depend on it. The profile is built from the sash frame, the outer frame, the glazing beads and other elements. Many types of window profile are available, and they differ from one another mainly in thickness. In today’s post we advise which profiles are worth choosing.

What distinguishes timber profiles?

The profiles of the timber windows in our range are made from the highest quality square timber with the right moisture content. Such timber must be neither too dry nor too wet, because it could begin to warp over time. It is laminated in layers. The finished profile of the timber window is then glued, precisely sanded and impregnated, and all the pores in the timber are filled with a special intermediate coating, thanks to which the varnish gains greater durability. The final task is applying two layers of the top coat.

What thermal transmittance should windows have?

Windows must provide adequate thermal insulation, which is why, when choosing them, attention should be paid to the thickness of the profiles and to the thermal transmittance Uw given by window manufacturers. It defines the exact amount of heat lost from the interior of a room to the outside over an area of 1m2 at a temperature difference of 1°C. The value of the Uw coefficient depends on the thickness used, the type of timber and the construction of the glazing unit.

Under the currently binding building regulations, the maximum value of the Uw coefficient for windows should not exceed 0.9 W/m2K: https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20130000926

Even the best window will not provide proper thermal insulation if it is installed incorrectly, which is why thermally efficient installation in line with the requirements of the standard is also very important, thanks to which the thermal insulation capabilities of modern timber windows are fully used.