好色先生TV

From the road near Southwold in Suffolk, the distribution warehouse of Adnams鈥� brewery is barely noticeable. The building sits in a hollow, so the gentle, rounded profile of its enormous green roof blends in perfectly with the surrounding fields. Its architect, Aukett Fitzroy Robinson, is perfectly at ease with this discreet presentation because its building is noteworthy for its environmental rather than its visual credentials 鈥� in fact, it is billed as Britain鈥檚 greenest warehouse.

That said, its handsome appearance belies its utilitarian function, and the green roof softens its 4,500m2 footprint. The roof, in turn, is supported by enormous curved glulam beams, which are described as the largest ever installed in the UK. Instead of the standard crinkly tin walls usual for this type of building, the exterior is finished in white render, and sits on a brick plinth. This hides one of the building鈥檚 most radical features 鈥� cavity blockwork walls made from lime and hemp, with the gap between the two skins filled with yet more lime and hemp to give the walls a U-value of 0.18W/m2K.

With the additional insulation provided by the roof, the building does not need a mechanical plant to keep the beer inside it cool, even in the summer, which means lower carbon emissions. Now the building is finished, the team can relax in a virtuous green glow. But pioneering the UK鈥檚 first commercial use of lime hemp construction was challenging. How did they get on?

For client Adnams, environmental responsibility is a part of its core values. Andy Wood, its managing director, says it was important to put this into practice at a reasonable expense 鈥� the 拢5.8m building cost 15-20% more than a conventional shed. 鈥淚f we want to set an example to our customers and shareholders we have to put our money where our mouth is,鈥� he says. 鈥淏ut it鈥檚 also a good business decision. This asset will have a life of at least 30 years, which will more than compensate for the costs, and second, the decision was based on a long-term view of energy prices. We estimate the energy savings are between 拢50,000 and 拢60,000 a year.鈥�

Aukett Fitzroy Robinson presented Adnams with a menu of options, including rainwater harvesting, solar panels and green roofs. 鈥淲e had to justify how much extra each option was costing and the payback periods. Plus, it had to meet Adnams鈥� criteria for operational efficiency,鈥� says project architect Nitesh Magdani. Straw bales were considered for the walls, he says, but discarded because of worries over fire, vermin and strength.

A company called Lime Technology advised on the practicalities of using lime render over straw, but ended up suggesting an alternative material 鈥� lime hemp. 鈥淟ime hemp had some way to go for this application, but it had the advantage of having been used in France for the past 20 years,鈥� says Ian Pritchett, managing director of Lime Technology. Helped by research funding from Adnams, Lime Technology worked with structural engineer Faber Maunsell and the University of Bath to develop and test a block solution 鈥� previously the material had been cast in situ like concrete. 鈥淧art of the reason for the blocks was so that contractors knew they could use a normal construction process 鈥� we didn鈥檛 want to put them off,鈥� says Magdani.

Clearly this strategy worked since

Haymills, the firm that took it on, saw it as a fairly conventional job, with a fast-track 40-week programme. 鈥淲hen we looked at it, we didn鈥檛 realise the complexity,鈥� says David Lott, Haymills鈥� contracts manager. 鈥淚t wasn鈥檛 until we moved onto site that we realised how complex it actually was.鈥� The first challenge was the glulam beams, specified because they contain less embodied energy than steel. The 40m long beams are the longest ever used in the UK.

The size of the beams worried Lott. Getting them delivered from Denmark was hard enough, but then he had to find a way to put them up. 鈥淲e had numerous meetings on the methodology,鈥� he says. The problem was keeping the steel columns and beams in place while they were fixed together.

Luckily, Lott heard about Mick King, a timber structure expert who runs a firm called Woodworks. 鈥淗e suggested the crane sizes and the methodology and even made some models to show how the beams would swing round,鈥� explains Lott. 鈥淚t was amazing 鈥� we thought we would need scaffolding, but he said it wasn鈥檛 necessary.鈥�

The solution was to use a crane to lift the beams. Straps were tied to each end, and these were attached to weights that anchored the beams in position while they were connected to steel columns.

With the structure up, Haymills started on the lime hemp blockwork. The timescale of the programme meant that 60 bricklayers were recruited to lay the 90,000 blocks. 鈥淭he blocks were a challenge,鈥� says Lott. 鈥淭he first lot crumbled 鈥� they were terrible. They got better as the job progressed, but they needed careful handling to prevent the corners being knocked off.鈥� Another problem was that the blocks were heavy and the bricklayers found them exhausting to use.

Five courses of blocks were laid, then left for four days for the lime mortar to go off before the lime hemp infill was placed. This was to prevent the pressure of the infill collapsing the newly laid blocks.

This stage also tested the patience of Haymills. 鈥淭he idea was to pump the lime hemp infill in, but there are only two or three suitable pumps in the world. We tried to modify a hedge-trimmer, but in the end we had to shovel it in by hand,鈥� says Lott. All this extra handling meant Haymills had to bring in extra fork-lifts to lighten the load.

If Haymills thought they were on the home stretch once the blockwork walls were up, they were wrong. The lime rendering had to be added by conservation specialist IJP 好色先生TV Conservation, a sister company to Lime Technology. The tight programme caught them out, and Haymills had to bring in a local firm of plasterers and trained them up.

All these factors added 10 weeks to the project. And Haymills was hit by the unexpected costs of the additional plant needed to handle the materials. 鈥淲e haven鈥檛 lost any money, but we haven鈥檛 made the margin we should have,鈥� says Lott. Despite this, all the parties involved in the project, including Haymills, are keen to do another one. 鈥淚t was so rewarding. The feedback we got was incredible,鈥� says Lott. 鈥淚t鈥檚 not just be another warehouse in Suffolk.鈥�