Collection 02
Windows & carpentry
The glass is only half the window. Whatever the glazing does, the frame and the perimeter decide what the customer actually gets — and the numbers on the two sides are rarely put together honestly. These tools do the whole assembly: glass, profile and edge, with each part's contribution visible so you can see which one is holding you back.
Same rules as everywhere here: the formula and the standard on the page, no sign-up, nothing uploaded, all of it computed in your browser.
Whole-window U-value
Uw to EN ISO 10077-1 from the glazing, the frame and the glazing edge, for any grid of lights. Shows what share of the loss belongs to each — and tells you whether it is the frame or the spacer that is costing you.
Hardware · liveSash weight and hinge load
What an opening light weighs from its glass and its profile — and the pull-out force it puts on the top hinge, which is what actually rips hardware out of a frame. Not the weight: the width.
Condensation risk
Lowest surface temperature at the frame and the glazing edge against the indoor dew point, so you can tell a customer whether their windows will run with water and why.
Glazing ratio and daylight
How much glass an opening actually delivers once the frame is taken out, and what it costs in heat to buy that extra light.
Why this collection sits next to the glass one
Because it is the same job. The person specifying a sealed unit is usually the person putting it in a frame, and the two decisions fight each other: better glass makes the frame the weak point, a slimmer frame moves the problem to the edge, and dividing the window for looks quietly undoes both. The tools are built to be used together — take a Ug from the EN 673 calculator straight into the window calculator and watch what the assembly does to it.