Oak Framing. Sustainable Design. OrientationMinimise heat lossIncrease insulationMake more airtightImprove glazing efficiencyPassive solar designControl ventilation. Summary. ShrinkageWhether to infill or encloseEnvelope detailsGlazing details. The impact of the new Part L1A building regulations on green oak frames.
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1. Construction Details for Green Oak Frames
3. Sustainable Design Orientation
Minimise heat loss
Make more airtight
Improve glazing efficiency
Passive solar design
4. Summary Shrinkage
Whether to infill or enclose
5. The impact of the new Part L1A building regulations on green oak frames The new standards call for a reduction of CO2 emissions by 20% compared to the 2002 values.
Reasonable provision has to be made to limit the loss of heat through the fabric of the envelope.
Glazing should be protected to prevent high internal summer temperatures.
Air permeability needs to be kept within reasonable limits.
7. Properties of shrinkage
8. Infill verses exterior envelope
Infill using modern materials
Advantages include traditional appearance and thinner exterior wall
Disadvantages can be water ingress, air leakage and continuing maintenance
Wrapping the frame in an exterior envelope
Advantages include improved insulation, airtightness and the use of high thermal mass materials
Disadvantages include loss of traditional appearance
9. Exterior envelope wall details
10. Sips Panel
11. Masonry Construction
12. Roof and floor details
13. Glazing Frames
14. Direct Glazing Double glazed units are held in place by an air dried oak cover
Shrinkage likely to occur on the inside
Either a dry or wet glaze method can be used
Toughened glass should be used throughout the system
15. Glazing horizontal members can be complicated
Either copper or lead flashings should be used to stop water ingress
Lead should be treated with bituminous tar
Opening doors and windows should be hung in their own stable frame
16. Minimising glazing problems Protect the glass
Timber quality should be good
Keep high heat sources away
17. Conclusions Shrinkage is the biggest challenge to overcome when designing with green oak
Oak frames can be either infilled or clad externally but future regulations may make infilling frames unacceptable
Ideally the fabric of the building should be put on the outside of the frame or therefore minimising the effects of shrinkage
Glass should be protected by some form of passive solar shading to prevent overheating