Evidence

Measured, not calculated: PScoat on the real building element

A U-value measurement series over almost twelve hours, a thermal image comparison before and after coating, and an experiment with a heated stainless-steel plate. All in the original, with raw data to download.

01 · In-situ measurement PSC-U-2026-001

0.140 W/(m²K) with approx. 0.5 mm of coating

A real historic solid wall, measured with a Testo 635-2 including U-value kit: continuously from 06.09.2026, 20:57, to 07.09.2026, 08:54. Heating off, windows closed, readings taken directly from the recording.

0.140W/(m²K) mean in the stable range, 01:15 to 03:15 hours

0.195W/(m²K) mean of the later phase, 05:00 to end of measurement

42,978usable data records

11 h 57 minMeasurement duration

U-value over the measurement period (median per minute from 42,978 data records). Light grey shading: stable range 01:15 to 03:15, weaker: later phase from 05:00. At the start of the recording the outdoor temperature sensor was still inside the room, so the first minutes are the documented set-up phase.

Inner wall surface (Tw)Indoor air (Ti)Outdoor air (Te)

Inner wall surface, indoor air and outdoor air during the measurement. The outdoor temperature fell from 17.0 to 6.0 °C over the measurement period.

In the stable range the median is 0.139 W/(m²K) and the standard deviation 0.016 W/(m²K); the measurement range runs from 0.111 to 0.177 W/(m²K). Wall build-up: three-leaf historic solid brickwork, cement/lime-cement render, reinforcing mortar with mesh, PScoat coating. Product: Basic B and PSC Build, applied in April 2025 to around 35 m² using about 18 litres of material.

Raw data (CSV, 4.7 MB)Measurement report with photo documentation (PDF)

02 · Thermal image

The same facade, before and after

Two FLIR images of the same house. After coating, the wall surface is shown distinctly cooler; uncoated elements such as the roof and dormer stand out more.

FLIR thermal image of the facade before coating: wall surface red to orange throughout — **Before**Taken on 16.02.2025, 19:01

FLIR thermal image of the same facade after coating: wall surface blue-green to violet — **After**Taken on 19.05.2025, 08:57

Thermal images show surface temperatures without a fixed scale. The images were taken on different days; the wall's U-value is given in the measurement above.

03 · Experiment

Heated stainless-steel plate: uncoated versus PScoat

A stainless-steel plate on a hob that is switched on, one half uncoated, the other coated with PScoat PSC 250T HP. The contact measurement shows it: the bare half reaches 255.4 °C (Testo 905-T2), while the coated half reads around 22 to 26 °C on the contact thermometer.

The values apply to the measurement described in each case and the documented build-up. The test reports, the CE marking to EN 15824 and the TÜV NORD Verified Product (mark ID 141649) can be found under Certificates and evidence.

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