The bare brick walls of a warehouse in North Hobart, Tasmania, encase a sensuous interior that Terroir Director and Architect Scott Balmforth created for his own family, using steel as his foundation.

Words Rachael Bernstone Photography Paul Bradshaw

Transforming a warehouse into a home for his family was initially a daunting experience for Terroir director and architect Scott Balmforth. Balmforth aimed to maintain the industrial aesthetic of the warehouse while making it habitable for his family, which includes three children aged under seven. “I wanted to achieve balance between the original character of the warehouse as well as moments of coziness,” Balmforth says, “so there is a contrast between the soft enclosed spaces of the bedrooms which are lined with plasterboard and have roof-light windows with views of the sky, and where galvanised steel predominates, and the lower level which is darker, with greater use of Formply that gives it a heaviness.”

Balmforth also wanted to maintain the sense of openness from front to back, so he installed steel framing to carve up the space vertically and horizontally. “Now you can drive into the garage and see through the glass-walled living space to the rear of house,” he says.

The dividing wall that bisects the warehouse comprises a primary steel frame with a party wall system for fire separation between the two tenancies. In his section, Balmforth installed three 200 Universal Beams parallel to the side walls to support the new upper floor. “It was important for me that the beams appeared as though they were spanning the 20 metres between the front and back walls with minimum depth,” Balmforth explains. “Upstairs, there is a sawtooth roofline, and the bottom chord of that gave the height limit for the upper floor, so to maximise the space on both levels, I set the timber floor joists within the steel beams, rather than sitting on top of them.

“The universal beam profile was ideal for this, whereby joists could be placed in to each side of the beam, and between the joists were placed infill offcuts to sandwich the joists in to the UB,” he adds.“These infills on both sides were then fixed through the web of the UB to hold it all in place tightly.” The integrated system incorporates the ply floor and strips of continuous diffused fluorescent tubing that light the ‘undercroft’ spaces and emphasise the linear character of the lower level.

Balmforth chose steel to provide longer spans for the primary structures and strength without mass. “There are a couple of columns strategically located on the ground floor, hidden within walls, so the overall effect is that you don’t know how the upper floor is hung,” he says. “Steel beams also fit with the character of the original warehouse.”

The conversion also features unconventional steel applications such as the galvanised screens – made from Expamet’s expanded metal sheet which is usually used for sun shading. “I’ve been interested in using the expanded metal product for a while,” Balmforth says. “It has a different character depending on where you view it from, and I appreciated that, installed as screens, the way you viewed it would change whether you were upstairs or down. It provides a good balance between privacy and openness.”

Also departing from convention, Balmforth brought some flat Zincalume® steel sheeting inside. “This project embodies ideas we’ve previously used [at Terroir], such as using flat Zincalume® steel sheeting as a ceiling lining,” he says. “It has some surprising effects: it acts like a lid for the house, because there was Zincalume® steel on the rear elevation already, so now it is wrapped around to the inside. We’ve used flat sheet in interiors before, and putting it on the ceiling seemed like a logical extension to my project.”

The existing galvanised sheet cladding on the rear wall took on an unusual character when new openings were inserted in that elevation. “When we cut the new windows, we peeled the sheet back so that it sits proud of the building, and the rigidity of the material means it doesn’t move too much,” Balmforth says.

Once the steel framing was in place, it provided the foundation for an experimental building process that produced some quirky outcomes. “A lot of the subsequent work resulted from very personal discussions I had with the builders from Tascon constructions,” Balmforth explains. “We were playing with opportunities that arose. A lot of the detailing, particularly in the way that the timber linings and beams are set within the steel framing and steel beams on the upper floor, was done on site with the builder rather than in documentation.”

The nature of the building process meant that architect and builder were able to devise solutions to problems as they arose. “When we put the expanded metal sheets up on 50mm backing board, the sheets had a bowed edge, so you couldn’t butt them up,” Balmforth says. “We arranged them as best we could, but there were still gaps at the bottom, so we had to go back over them and apply 50mm-wide by 3mm-thick plates, which just adds another level of irregularity to the project.”

On the lower level, where the Formply wall lining was prone to being damaged, architect and builder opted to apply mild steel plates that sit slightly proud of the joints to take the impact on corners. “That was another of the solutions we devised as we went along,” Balmforth says.

By carefully combining cold, strong and hard materials such as steel, concrete and Zincalume® steel with warmer and softer surfaces such as lime-washed timber and hand-carved door pulls, Balmforth has created a home that is true to its roots and conducive to family life.

Location of Steel solutions

Beams
Interior Walls
Structural
Light Steel Sections
Roof
Windows