Underhill - Data

Type of building:

Detached house

Description:

New-built, underneath an existing old barn which has also partly been renovated at the same time.

Town:

GL56 0PR, Barton-on-the-Heath, Moreton-in-Marsh

Treated floor area

358m²

Construction:

 

Construction method

Externally insulated concrete walls, floor and ceiling

External walls:

Underground: U-value = 0.117 W/(m²K)

220mm concrete

Fosroc drains/membrane

310mm insulation (035 & 038)

Ambient: U-Value = 0.153 W/(m²K)

220mm concrete

250mm insulation (040)

Lotusan Acrylic render

Floor slab:

Insulated concrete slab: U-value = 0,146 W/(m²K)
250mm Concrete, screed & resin finish
250mm Insulation (038)

U-value = 0,146 W/(m²K)

Ceiling:

250mm Hollowcore concrete & screed
360mm insulation (038)

Earth & partially insulation
U-value = 0,085 W/(m²K)

Windows:

Optiwin Alu-2-Holz, overall average UW = 0.74 W/(m²K)
g-value: 50%

Doors:

Optiwin “Frostkorken”
U-value door: 0.72 W/(m²K)

Ventilation:

PAUL campus 500DC balanced mechanical ventilation system utilising Passive House certified heat recovery unit with 83% efficiency and 0.28Wh/m3 energy consumption (according to PHI test methodology).

Heating:

“Woodfire F12” wood burning stove with back boiler, sealed to room air. 2 post heaters (water based) in air supply ducts distribute the heat.

DHW:

“Solex” solar thermal roof with 40m² collector area and 2000 litre accumulator tank; in winter via back boiler from wood stove, backup through electric immersion heater.

Other ecological aspects:

Special building warrant in an area with total new-built prohibition granted through the unique character of the building. It blends perfectly into the landscape and with the existing, 300-year-old barn…

Key figures:

 

Air tightness:

n50 = 0.22/h; q50 = 0.23m3/(m2h)

Heating demand:

13 kWh/(m²a) according PHPP

Heat load:

9 W/(m²) according PHPP

Primary energy demand:

62 kWh/(m²a) for heating, DHW, electrical consumption for appliances, etc. (according PHPP)

Designers:

 

Year of finishing:

2010

Architect:

Helen Seymour-Smith

Passivhaus planner:

SPHC

E/M Engineer:

Dynamight Passive Solutions

PH Certification:

Through SPHC on 29th January 2010