OP19 - Architecture Office Archipente

Current status: 
Building Owner: 
Cabinet d'architecture Archipente
Consulting EuroPHit Partner: 

LaMP - Contact person Simon Camal

Existing treated floor area (usable floor space): 
151.00 m²
Original situation: 

Office in timber frame constructed in 1995.

100 mm wood fiber between timber, roof partially insulated with 200 mm wood fiber.

Windows with wooden casement double glazing filled with air, near end of service life : poor airtightness, defected sealants.

Poor airtightness measured by blower door test before retrofit measures : n50 = 7 h-1

Heating consumption : 150 kWh/(m².a) verified by calibrated PHPP on heating season 2014.


Modernisation proposal: 

Retrofit steps :

- New windows of passive house quality triple glazing with exterior shutters

- Take out cladding, Apply airtight membrane, Install new insulation layer with wooden fiber, Replace cladding.

- Insulation and airtightness at junctions on plywood eave.

- Mechanical ventilation with heat recovery


Efficiency improvement: 
PHPP verification sheet before retrofit: 
after retrofit: 
Current situation: 

Detail design

Concept studied for airtightness in the context of dispersive layout of electrical cables.

Other downloadable materials: 
42600 Montbrison