The Haringey PassivTerrace

winner of Retrofit for the Future

Anne Thorne Architects – Site Diary so far……Week 1

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Below is a summary of my weekly site visits with the Site Manager, Paul, at Hawthorn Road, so talk through any issues that come up on site during the retrofit, and monitor the progress of the build. As this is a Design and Build contract, Anne Thorne Architects are now appointed by the contractor, but we still liase with the client, MHT, on the project.


The triple-glazed windows from the Green Building Store have a 10-week lead in time, so it was important to check the opening sizes on site asap to confirm the order and hopefully prevent any delays in the window delivery, as crucial to many of the details and air-tightness. A few site dimensions checked and structural steels beams ordered. These are to support de-conversion works, and not specifically related to the retrofit. Timber posts used instead of steel, or beams supported off existing internal partitions to avoid increasing any thermal bridge points with steel columns sitting directly on concrete floor, which is insulated above.

Week 1 – 10 Sep 10

First week on site!  Met on site with the site manager from Sandwood, Paul Archer, and the subcontracting renderer, Michel, who will be installing the external render to the rear elevation, and plastering internally, so key to the quality of the air-tightness and integrity of external insulation.

Walked through site and talked through air-tight junctions with Paul, such as sequencing of works and protection of air-barrier during construction. Sandwood have a fantastic record on air-tightness, so really hoping we achieve below 1 air-change-per-hour.

Strip out has commenced, timber ground floor joists have been removed, as well as all existing plasterboard and door and window linings in preparation for this ‘deep’ retrofit.

Onsite decisions included the dropping of a rear bedroom window to avoid clashing with the insulation roof slope; an eaves support detail of the extended eaves over the external insulation.

Sandwood are firstly concentrating on the strip out and structural works (converting the 2 existing flats to 1 family house). Air-tight detailing due to start next week.


Written by jennieswainatap

October 12, 2010 at 11:15 am

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