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structural elements
‘Compared to alternative construction methods, the open structure of an oak frame pairs up perfectly with roof and wall panel insulation systems’
and rafters or trussed rafters, which reduces time spent on site. Compared to alternative construction methods, the open
structure of an oak frame pairs up perfectly with roof and wall panel insulation systems. Once the oak frame has been constructed, the next step is to apply SIPs which fit on the outside of the frame, creating an extremely energy-efficient, uninterrupted envelope. On top of this layer is a waterproof membrane and external
cladding, whereas on the inside the oak frame is exposed while incorporating a service void and interior wall covering. This high level of insulation is excellent at allowing a building to retain heat. The encapsulation can easily be increased in spec- ifications towards meeting Passivhaus standard, making the oak frame a perfect complimentary material to a high performance building envelope.
Leak-proof glazing system
Traditionally, oak frame glazing solutions invariably incorporated PVCu, aluminium glazed systems or varnished
hardwood frames. Contrary to popular belief, it is possible to successfully glaze a green oak frame. The solution comes in the form of a TRADA-approved
encapsulated glazing system (EGS). Our own EGS uses drip profiled, fully air-dried oak capping, which is carefully conditioned for outside use. Spacer bars, routed drainage channels and weather strips are combined with a high plasticity sealant, flashing and EPDM (Ethylene Propylene Diene Monomer) rubber seals. There is even a cavity for humidity venting and extra insulation if required. This highly sophisticated system eliminates the possibility of
leakages either around the glass or through the oak frame itself. Furthermore, the insulation properties of this system are far superior to other systems, greatly reducing cold bridging, thermal resistance and keeping the building warm and dry. The system is designed to work with any glass, including
acoustic, triple glazing and various coating options, although a typical solution will involve toughened 28 mm double glazing filled with argon gas, creating high levels of insulation. This is then bedded onto EPDM black rubber glazing tape. The whole system provides the necessary flexibility needed to accommo- date the movement of the green oak frame.
Ed Hamilton is managing director of Oakmasters enq.164
enq.165
www.architectsdatafile.co.uk
enq.166
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