You are here: HomePassive House Institute | Expertise | Product development & certification | Optimisation

Thermal optimisation of building products

The Passive House Institute provides consultancy on the thermal optimisation of building products from the very beginning of the process through to pontetial Passive House Component Certification.

In addition to other tools, we make use of two and three dimensional as well as dynamic thermal flow analyses.

Example 1: Insulated window frame

Frame profile Timber exterior insulation finishing system (EIFS) insulated PVC profile
Frame U-Value Uf [W/(m²K)] 0.62 0.69
Elevation width [mm] 131 120
Edge bond ψg [W/(mK)] 0.031 0.029
Glas rebate d [mm] 26 30
Glazing (44 mm) Ug [W/(m²K)] 0.70 0.70


Example 2: External wall connection to unheated cellar ceiling

U-Value (External wall) = 0.12 W/(m²K)
U-Value (Cellar ceiling) = 0.12 W/(m²K)

Thermal bridge coefficient:
ψa = -0.054 W/(mK)


Next Courses

PHPP Expert
Passive House Designer / Consultant
Construction Verifier
Site Supervisor
read more



iPHA Webinar "Cold air distribution - a novel approach to meeting Passive House Cooling Loads? | June 5, 2024
read more

Passive House Open Days |
28 - 30 June 2024

read more

Component Database

Passive House
Component Database
read more


read more

New developments

read more

NEW: PHPP 10 (2021)
read more

Seals for Certified Passive House Components
read more

Passive House Classes,
Classic, Plus, Premium
read more

EnerPHit -
PHI certification for retrofits
read more

Wall plaque
for certified Passive Houses
read more


Press releases

Latest press releases

Research & Literature

Passive Houses for different climate zones

Retrofits with Passive House components -
EnerPHit Planner Handbook
(in German)


Passive House Retail Stores now out
Overview of contents
(in German)

PHI Literature

© copyright Passive House Institute 2024