Garden Studio
   
Garden Studio in Sheffield, UK, summer 2010; Photos Courtesy of David FosterProject Name: Garden Studio
Year: 2004
Owner: David Foster
Location: Sheffield, Yorkshire, England, UK
Building Type: Single-Family Residential
Type: Extensive
System: Single Source Provider
Size: 225 sq.ft.
Slope: 2.5%
Access: Accessible, Private
Submitted by: David Foster

Designers/Manufacturers of Record:
Owner/Designer: David Foster
Photos Courtesy of David FosterThe Garden Studio, summer 2007; Photos Courtesy of David FosterPhotos Courtesy of David Foster
Completed in April, 2004, the 5m x 4m Garden Studio is cut into a 1 in 3 hillside, self-built in autumn 2003/spring 2004, entirely in timber and entirely suspended (walls and floor) from two recycled steel beams beneath the roof, bearing on a previously existing concrete retaining wall at the top (back) of the slope and blockwork piers at the front.
Photos Courtesy of David FosterPhotos Courtesy of David Foster
The roof build-up comprises:

- meadow grass and indigenous flowers
- on 150mm native clay topsoil
- on geotextile filter membrane
- on Erisco Bauder expanded polystyrene insulating reservoir boards (?11/m2)
- on 1200g polythene root barrier membrane
- on 50mm extruded polystyrene insulation
- on 2 layers polyester fibre reinforced bituminous roofing felt
- on 18mm external grade plywood laid to 1:40 falls
- on 250 x 50 tanalised FSC softwood joists
- single 75mm roof outlet to internal downpipe draining to stone filled soakaway pit
- summer irrigation by redirected roof downpipe and bath/shower-water drainage stack.

Lessons learned:

- 150mm soil layer is too shallow and needs to be watered during extended periods of hot dry weather
- cutting grass too early in season inhibits regermination of less hardy flowers
- cutting grass too late in season leaves roof looking bare through the winter.

Architect/owner David Foster says it has been a great 2010 spring for wildflowers in the UK - the center photo and the left side photo below show the more mature green roof:

Additional thumbnail photos:

The Garden Studio, summer 2010; Photos Courtesy of David FosterPhotos Courtesy of David FosterThe Garden Studio, summer 2010; Photos Courtesy of David FosterPhotos Courtesy of David FosterThe Garden Studio, summer 2007; Photos Courtesy of David Foster
For more information regarding this project, contact the owner/designer David Foster at: david.foster@bdp.com.
 
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