Lift & slide door 85 mm

The new aluplast HST 85 mm lift and slide doors are unique on the market: they are available in three different variants, depending on the requirements for thermal insulation: from the basic version, through the standard version, to the premium version, which meets the highest requirements for passive houses.


The new HST 85 mm door system is on the one hand a response to expectations of creating ever larger window constructions, and on the other, due to structural changes and, above all, the possibility of using larger glass packages up to 51 mm wide, allows achieving above-average properties in the field of thermal insulation . A novelty in this segment is the modular nature of the structure, which allows three optional configurations of the product, depending on the expected thermal parameters.


HST 85mm Basic

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HST 85mm  Standard

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HST 85mm Premium

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The new system solution HST 85 fixframe with a very narrow frame in the perimeter part, it fulfills the postulate of maximizing the glazed areas, increasing the amount of light entering the rooms and efficient use of thermal energy from the sun.



Thanks to the freedom to choose different combinations of profiles in the part of the door header and in the threshold, we have the possibility of choosing between three options: Basic, Standard and Premium, which are addressed to different groups of customers with different requirements regarding thermal insulation.

Due to the increase to 85 mm in the depth of the wings used in HST balcony door constructions, the sealing node has also been modified on the line of overlapping profiles of moving and permanent parts. The flat gasket used so far has been replaced with a tubular EPDM gasket. By increasing the values of operational forces necessary to completely close the wing, a significant increase in the air tightness of the joint was obtained in this way.


Thermal properties of the HST 85 door

Changes in the construction of sections have allowed for a significant improvement in thermal permeability of profiles, which depending on the chosen option allows to obtain a weighted average value of the heat transfer coefficient Uf = from 1.5 W (m2 * K) in the Basic version, through Uf = 1.3 W (m2 * K) in the Standard version up to Uf = 1.1 W (m2 * K) in the Premium version.

The currently tested value of the Q100 coefficient allows classifying aluplast HST 85 mm doors made in scheme A to class 4 of air tightness in accordance with PN-EN 12207:2001 norm, which in accordance with the requirements of technical and construction regulations in the field of air permeability enables using these structures in all types of buildings.

Lift and slide doors HST 85 - thresholds

Depending on the object requirements and the buyer's expectations, the Aluplast HST 85 mm balcony door comes in three different threshold solutions.


The threshold in the "Basic" version is made of aluminum with the exception of a small PVC element on the inside. The threshold in the "Standard" version has a similar design, but aluminum parts are separated from each other by a polyamide thermal break. The threshold in the "Premium" version is made entirely of plastic reinforced with GFK glass fiber. In addition, all the threshold chambers were filled with PU foam, which additionally increases the values of the element in the range of thermal permeability, limiting the value of the linear thermal bridge within the construction threshold without compromising its structural rigidity.


HST doors are a modern and safe solution, designed to eliminate ubiquitous barriers. The low door threshold, 48 mm high, which can be recessed from the room's side in its height, meets the requirements for architecturally unobstructed construction and enables easy entry and exit. Thanks to special overlays it is also possible to level the threshold with the floor surface and thus completely eliminate architectural barriers.



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