Deceuninck Decalu88 Entrance Door

Why doors bow in the sun, and what 2.5 mm means

Metal grows as it heats. On a door facing the afternoon sun the outer skin expands while the inner one, cooled by the air conditioning, stays where it is, and the leaf bends like a bimetal strip — on some doors enough to lift a corner off the seals, so the lock drags and dust finds its way in. Decalu88 separates the two faces with ABS inserts so they can move independently, and the published maximum bowing under heat stress is 2.5 mm. For a dark door on a west-facing entrance, that figure matters more than any design detail.

Where this door fits

Villa and townhouse front doors, the door into a majlis wing, a side entrance from the garage — hinged entrance doors a household uses many times a day, glazed where the hall needs light and solid where it needs privacy. Watertightness of 450 Pa (NBN EN 12208) and wind resistance class C4 (NBN EN 12210) are the figures to hold against an exposed entrance without a deep canopy.

The published U-value — from 1.3 W/m²K with double glazing and from 1.0 with triple, not stated as a door or a frame value — keeps the entrance hall from becoming a heat trap next to a cooled living room.

Entrance Door or French Door

Decalu88 French Door has the same 88 mm depth but is built on the bi-fold system as a double-leaf door, with air permeability class 3 and a U-value from 1.4 W/m²K double-glazed and from 0.68 triple-glazed. It is a garden or terrace door opened as a pair; the Entrance Door is the single front door with the lock you turn every day. For the way into the house, the entrance door; for the way onto the lawn, the French door.