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A weatherboarded wall with eaves vents

Working details

The new gallery was originally a barn - with steel portal frame and corrugated cladding - which stored timber packing crates for transporting sculptures. The steel portal has been re-clad with stained timber boarding, and the gallery has been given a new zinc standing-seam roof.

The portal frame is braced by internal walls of blockwork lined with 150mm of insulation and finished with Hardwall plaster. This construction, combined with an insulated concrete floor and double-skin plasterboard ceiling, contributes to the thermal mass and conserves energy, an important consideration in a low-occupancy building. A row of mechanical vents has been installed at the eaves which, following hot days, are opened to admit the cooler night air through an insect-mesh screen and direct it downwards through fixed louvres. On cold days, heating pipes in the floor are turned on and the vents remain shut.

The weatherboarding of 22mm rebated t&g Douglas fir boards runs horizontally in single lengths between vertical T-shaped framing pieces and top and bottom sills. The boards are fixed, via battens and breather paper, to a series of 150 x 50mm spars set between angles bolted to the original stanchions.

Each eaves vent comprises a Velfac composite timber/ aluminium window frame lined with insulation and clad with weatherboarding. The internal wall openings are lined with aluminium louvre grilles.

A purpose-made zinc gutter runs above the eaves vents and discharges into square-section downpipes at the corners. The ventilated verge extends to form the junction between the gutter end and the zinc-clad gable.

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