Lena Gardens, Passive House, West London   Teplo Tie  
 Lena Gardens  TeploTie


Second only to the Princedale PassivHaus Retrofit, the Lena Gardens project used the same techniques to produce yet another Passivhaus certified project: 150mm internal insulation, triple glazed sash windows, OSB airtight layer, heat recovery with labyrinth under the basement floor, and the steel beams holding up the floor joists.

Where Lena differs is that its a bigger and more richly ornamented building. It has a new build extension at the rear, and it is a private project.

As with the Prince Dale Passiv Haus Retrofit, the house was initially gutted internally and a steel frame was constructed internally separate from the existing external masonry walls to allow the creation of a thermal bridge free insulation zone between the masonry and the steel frame.  MagmaTech supplied a bespoke TeploTie with a stainless steel threaded end which was chemically anchored in the existing external masonry wall and then fixed to the steel frame with a bolt on the threaded end thus tying the new and old structure together without creating a thermal bridge.

In the first year of monitoring the house used 2,500 kWh for space heating. With a floor area of 195m2 this equates to 12.8kWh per m2 per year (well below the Passiv Haus requirement of 15 kWh per m2 per year for space heating and is exactly the performance that the Passiv Haus Planning Package (PHPP) modelling software predicted. Overall the house achieves a 90% reduction in total energy usage and for the year 2011-2012 the total energy cost for the house was just £189.40.

The project was led by Green Tomato Energy and is the family home of their Chairman Tom Pakenham.

Green Tomoto Energy

An excellent video blog on the project is available here : Video

A detailed case study is available here: CIBSE Journal

February 2011