No run of the mill 'Haus' in Bandon with energy bills of €15 per month

Just-built in Old Chapel, outside Bandon, this is a 'Haus' constructed to rigorous standards 
No run of the mill 'Haus' in Bandon with energy bills of €15 per month

Passive House, Old Chapel, Bandon,  Pictures Janice O'Connell/F22 Photography

THERE’S an irony in the modest siting and demeanor of a just-built new home, constructed to rigorous passive home standards in Cork’s Old Chapel, on the outskirts of Bandon, in a prosperous setting which was busy back 200 years ago for its cotton mills, among other hives of industry and mill activity.

This 2021-completed home was quite precisely set on its rural site just within the town’s catchment to get views of a centuries’ old mill building remains, part of the Overton estate and Allman family’s milling dynasty which employed thousands, standing, near-skeletal, high on a hill a few fields away from this one-off, which in contrast was set most deliberately so as not to shout out its own presence.

Passive House Oldchapel Bandon Architect Paul McNally Pictures Janice O'Connell/F22 Photography
Passive House Oldchapel Bandon Architect Paul McNally Pictures Janice O'Connell/F22 Photography

The mill’s remains, set on a crest of the hill, catch the eye from the kitchen, living, and dining areas of this single-storey, contemporary build, under its low-profile zinc roof, a contemporary construction which is best really only appreciated from the air, by birds, or drones.

It’s low slung and angular in its floor plan, not-quite star-shaped, measures 164 sq m or 1,750 sq ft and is inserted into its sloping site, on the edge of wood-fringed fields of pasture, next to a mid-20th century family home which yielded up this plot for another generation of family, returning to live in Bandon.

All the bedrooms are in one wing
All the bedrooms are in one wing

It’s not just the house’s low profile that intrigues and, that’s only once you get up the entrance drive, because, from the road, there’s nought to be seen. Not a hint of it, really, bar entrance gates, and a wending drive.

Then even when you get up close, it gives little away as to what exactly is inside. It’s distinguished (or, rather, indistinguished?) by a main façade of four wide sections of Siberian larch, with four vertical white rendered divides, holding drainpipes, and with a discrete entrance door next to a garage, which is itself bunkered or built under an earth-sheltered sloping roof, rising ramp-like from the just-surfaced drive.

A footpath through the just-seeded grounds at Old Chapel new-build Picture: Janice O'Connell/F22 Photography
A footpath through the just-seeded grounds at Old Chapel new-build Picture: Janice O'Connell/F22 Photography

What’s going on? What is it?

It’s a different take on the passive house design, that’s what, and it’s a brave melding of bungalow/single storey home (generally not the most efficient way of laying out a house for energy conservation, rooms are better stacked one floor atop another to reduce roof area and potential heat loss) with precise design and construction standards met.

Architect for this intriguing one-off is Paul McNally of The PassivHaus Architecture Company, based in Cork city and who’s been an early Irish expert in this burgeoning field in both residential and commercial projects, ever before the move to NZEB advanced on the old Part L energy rating requirements and need for A-BER ratings on all new builds.

The main façade of four wide sections of Siberian larch.
The main façade of four wide sections of Siberian larch.

While he doesn’t disclose the build cost, and the elaborate zinc roof and its several minutely-detailed raised roof lights will have added to the costs, Paul says getting a house to an accredited passive standard over and above NZEB requirements, is typically a further 5% cost on the overall budget.

In this case, and thanks in part to the last year of pandemic disruptions, construction just wrapped up late 2020 after a c 18-month on-site process, done with aplomb by builder Chris O’Donovan Construction Ltd, with Chris originally a plasterer by training.

The key to getting PassiveHaus accreditation is, of course, avoiding thermal bridging and airtightness, so huge attention had to be paid to things like taping and sealing (harder in a masonry build than in timber, but timber framing can be a marginally higher cost). It eventually came in with an airtightness level of 0.635 ACH at 50Pa, but that was only after a small panic over some air loss after some of the higher-set window openings were adapted to take remote-controlled actuators or motors to open.

These actuators lock differently, locking in at one point rather than at three points, allowing for minute but noticeable air tightness degradation.

Construction just wrapped up late 2020 after a c 18-month on-site process.
Construction just wrapped up late 2020 after a c 18-month on-site process.

Also a challenge was the design of the five glazed roof lights set into the zinc clad roofs: McNally got around that by having triple glazed panels flush to the roof/ceilings, and then topping the frame or upstand above (where sealing can be an issue) with another single glazed pane. It was important, he adds, that the roof light was sealed on the top of the upstand on a very dry day, to avoid trapping in any moisture or condensation.

Rooflights a stand-up feature in the bedrooms' corridor. Each has triple glazing set at ceiling height, with a single pane on top of the 'upstand'
Rooflights a stand-up feature in the bedrooms' corridor. Each has triple glazing set at ceiling height, with a single pane on top of the 'upstand'

Notable too as part of this home’s design is the overhang on the main living area roofs, with the floor-to-ceiling glazing set back on the southern aspect to avoid overheating from the sun in summer when it’s high in the sky, and there’s also some lateral shading from projecting sidewalls thanks to the cranked or angled plan. (If you are living in an old, cold traditional Irish build and would relish the thought of any ‘overheating’ at any time, look away now: the estimated energy bills for space heating and cooling here are €15 per month…that’s €180 pa, about one third the cost of an oil tank fill, and that’s for a home of up to four bedrooms (or, three with end-of-wing home office,) with master bedrooms en suite and two others share a bathroom in a Jack and Jill arrangement.

Architect Paul McNally: the old mill is just discernible on the crest of the hill
Architect Paul McNally: the old mill is just discernible on the crest of the hill

The 1,725 sq ft here include those four east-facing bedrooms all off a linear corridor, brightened by the regular punctuations of light from above in three or four of those roof lights, and there’s another over the kitchen island and its dark units next to a big utility/comms room, with largely open-plan combined kitchen/dining/living room in angled spaces and views up to the old mill that serves as a location pin for this low-slung new kid on the block.

A bathroom designed to please.
A bathroom designed to please.

Designed to please.The feature roof was done by Pike, Clonakilty-base Ray Wycherley of Wychbro Coppersmiths, QS was Byrne and Co, while DKP International were Mech& Elec professionals.

Triple glazed Passiv aluP windows and doors (0.8 W/m2k U-value) came from Munster Joinery, and the custom-built roof lights and rain screen were done by Ringaskiddy-based Precision Quality Glass/PQG.

Heating is via a Daikin Altherma air-to-water heat pump, with mechanical heat recovery/HRV at an 81% heat recovery rate, and solar photovoltaic panels supply electricity, while cavity walls (250mm cavity with Quinlite blocks and basalt ties) were filled with extruded polystyrene.

Note the overhang for solar shading
Note the overhang for solar shading

With the job done, landscaping settling in, and its unusual grass garage roof ramp forming part of the visitors embrace on the first arrival, this Bandon home owners, a couple, can look forward to years of easy,  comfortable, post-Covid-19 home life, and their view to the old Overton mill building on the hill a sign of earlier times, and simple but no less strenuous building times.

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