An airtight floor staircase saves heat and damage

For a completely airtight completion of a floor staircase around four meters circumferential gap between staircase and floor ceiling must be sealed professionally. In addition, there is a precise closure of the hatch or flap, which must come to rest precisely by means of snap-locking in the surrounding bearing profile.

Hatch and fugue

At a landing staircase two risk factors for an air passage must be switched off. The closed flap must be perfectly stored in the circumferential profile and the gap between the feed frame and attic ceiling needs proper insulation, which must be able to withstand not only heat but also moisture and steam.

In principle, an attic staircase should have no difference to the surrounding ceiling floor. The aim is to achieve 100% airtightness with a heat transfer coefficient or U-value that comes as close as possible to the remaining area.

Horizontal and vertical tightness

If you want to build a loft ladder yourself, you must pay attention to a millimeter-accurate and distortion-free feed frame during assembly. The hatch or flap, on which the staircase is mounted, must be flush with the frame edges after the snap-in latch engages in the rectangular bearing profile.

Irregular distances both horizontally and vertically must be eliminated. While the horizontal alignment is adjusted at the feed box, the ideal position of the spring is also decisive for the vertical position. The flap should be "pulled in" with light pressure on the edge of the frame to achieve optimum airtightness. The tightness is supported by soft elastic sealing tapes, which are glued in the bearing profile.

Types of damage with draft

The approximately four-meter-long joint, which runs between the feed frame and attic ceiling of the attic stairs, must be completely and repeatedly sealed. With air passage, several types of consequential damage can quickly arise:

  • Heat loss up to seventy percent
  • U-value increase by more than three points
  • condensation
  • mold growth

As air that flows through transports not only heat but also moisture and, in addition, can further damage imperfect insulation and insulation through pressure equalization, existing air leakage increases this effect self-satisfactorily.

Tips & Tricks

If you install the last covering of the attic stairs, usually the cover strips of the feed frame downwards, you should fix the last insulating material in parallel. An insulating braid, which has already been incorporated into the joint, is ideally suited, which is pressed in during assembly of the strips and pressed flat.

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