Terrace over room — termPIR® MAX 19

When to use this system

termPIR® MAX 19 AL is the choice when every mm of terrace height counts:

• Terrace over living room / kitchen in a single-family house — where the threshold of the balcony door must be flush with the internal floor level, and the height of the layer package (insulation + slope + waterproofing + flooring) is limited to 200 mm.
• Terraces over commercial premises in multi-family buildings — where the height of the garage beneath the terrace cannot be reduced.
• Renovation of existing flat roofs — adding an insulation layer without raising the roof curb (conversion into a usable terrace).
• Passive houses (PHI ≤ 15 kWh/m²·year) — where the U-value of the roof must be ≤ 0.10 W/m²·K. MAX 19 AL 180 mm achieves U = 0.10, vs ~230 mm for standard termPIR® AL.

Lowest lambda in the range

MAX 19 AL has λ_D of 0.019 W/(m·K) — the difference compared to standard AL (0.022) seems small, but for thin layers it provides a significant advantage:

Required U	Standard termPIR® AL (λ=0.022)	termPIR® MAX 19 AL (λ=0.019)	Thickness saving
0.25 W/m²·K	90 mm	80 mm	10 mm
0.18 W/m²·K	120 mm	100 mm	20 mm
0.15 W/m²·K	150 mm	120 mm	30 mm
0.11 W/m²·K	200 mm	180 mm	20 mm

A 30 mm difference with a limited terrace threshold height is typically the difference between feasible and unfeasible solutions.

Available thicknesses

MAX 19 AL is a special variant with a limited thickness range:

• 80, 100, 120 mm — standard availability
• LAP edge profile (stepped) from 30 mm thickness
• TAG edge profile (tongue-and-groove) from 40 mm
• Format: 600 × 1200 mm, thickness calibration ±0.5 mm

Terrace installation requirements

• Slope — minimum 1.5% from the threshold towards the drain. The slope can be achieved with a termPIR® BWS sloping layer beneath MAX 19 (the load-bearing layer remains the proper insulation).
• Waterproofing — under the terrace flooring two-layer (heat-welded bitumen membrane 2× or TPO + top bitumen layer).
• Terrace flooring — frost-resistant porcelain stoneware on adhesive mortar, decking timber on a joist substructure, or WPC composite board.
• Roof drain heating — electric trace-heated drain in the freezing zone (recommended).
• Edge zone — terrace corners reinforced with additional bitumen strips turned up onto the parapet or wall.

Technical documentation

termPIR® 2025 brochure (Gór-Stal, 2025-04-23, pp. 4, 8). termPIR® MAX 19 AL — high-end variant with dedicated application for energy-efficient buildings. Technical data sheet available in the For designers section.

Layer composition

U-value by insulation thickness

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