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Thermal-break profiles

Thermal-break mounting for windows and doors

High-density EPS support profiles move the frame into the insulation layer — no condensation, no heat loss at the joint.

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  • 9 sizes
  • ift Rosenheim certificate
  • Passive House certificate
Cross-section of a VSThermo window mounting node

Why a window freezes at the bottom

Something always sits under the frame. In a standard installation that is a hollow plastic support profile: it carries the frame and conducts cold from outside into the room at the same time.

In frost the bottom joint becomes the coldest surface in the room. Then the chain: condensation on the reveal, ice along the junction, black spots in the corner a season or two later.

The call about that does not go to the profile maker. It goes to whoever fitted the window.

What changes in the node

  1. A VSThermo profile goes under the frame in place of the standard support profile. Material — EPS at 150 kg/m³, thermal conductivity 0.04 W/(m·K).

  2. Hybrid polymer bonds the profile to the base and closes the joint.

  3. Tape seals the junction with the wall.

Mounting height follows the node: 30 mm for an ordinary bottom junction, 45 mm under increased load, 100 mm under door thresholds. Operational length of the profile — 1180 mm.

The prewall systems VST 80×90 and VST 80×140 solve a different problem. They carry the frame out of the load-bearing wall plane into the insulation layer by 90 or 140 mm, so the junction never reaches cold material.

Which profile you need

View the catalog

Support profiles

7 sizes for the bottom junction of windows and doors. Width from 50 to 69 mm follows the mounting width of your profile system.

VST 63×100 stands apart: it is designed for door thresholds and sliding systems, where the node is taller and the load runs differently.

Pre-wall frame systems

VST 80×90 and VST 80×140 — for the case where the window sits in the insulation layer rather than the load-bearing wall. Offset of 90 or 140 mm.

What backs this up

The values are the same for all 9 sizes — only the geometry differs.

Density, kg/m³150 ± 5%
Thermal conductivity, W/(m·K)EN 13163:2012 + A1:20150.04
Compressive strength at 10% deformation, kPaEN 13163:2012 + A1:20151900
Reaction to fire classEN 13501-1:2018E
Water absorption during long-term immersion, %EN 13163:2012 + A1:20150.5
Classification codeEPS-EN 13163-CS(10)1900-WL(T)0.5

According to test report No. 272/T2022 of September 2, 2022, issued by notified body No. 1434.

Manufacturer documents

Documents are hosted by the manufacturer, LLC «OLIS».

Does it fit your system

The profiles work with Rehau, VEKA, Schüco, Kömmerling, Salamander, Gealan, Aluplast, Aluprof, Reynaers, WDS, Decco and others — PVC and aluminium.

The manufacturer has a cross-section drawing for each system: it shows which size fits your node and to what depth.

Check your system

Find the profile for your node

Tell us which profile system you have and which node you are closing. You get back the cross-section drawing and the size that fits it.

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