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You will need
to demonstrate Building regulation compliance by a Window Energy Rating OR by
the U value method
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VERSION
3.1 (October '11)
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Alternatively, in a statement issued by FENSA, any
window installation featuring:
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• Soft coat low E glass, argon and a warm
edge spacer
or
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• Hard
coat low E glass, argon, warm edge spacer & low iron glass
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will deem
the window as compliant, without any further evidence. Proof of the installed IGU configuration
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will be required, however this method will mean a
higher than necessary Liniar spec. window is installed.
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Product
Specification
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Foiled
product reinforcement guidelines as per white profiles
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Indicative
U-value
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Step 1:
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Define the profile suite & specification
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Bead:
Internally glazed specifications
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Building
Regulation compliance level 1.6 or less
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Select Suite:
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Liniar has partnered with
Build-Check to incorporate our product range within the Oracle U-Value
Calculator. Available through the Liniar website homepage, the resulting headed certificate can be
printed for presentation to FENSA or
Building Control to demonstrate compliance.
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Profile Spec:
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Optional
Specification:
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Step 2:
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Define the IGU (Glazing) configuration
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Thermal
Transmittance
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Select IGU specification:
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IGU Config:
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(Indicative U - value)
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W/(m2·K)
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Select Outer Pane:
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Product Ref:
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There is a small annual charge for unlimited
use of The Oracle, this is
payable directly to Build Check, contact Frances on 01494 452713.
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Emissivity:
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(Low E glass)
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Select Gas Fill:
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Gas content:
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Glazing Supplier:
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Centre Pane:
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W/(m2·K)
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Indicative
WER Ratings
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Step 3:
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Define the Spacer Bar specification within the IGU
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Building
Regulation compliance level 'C' or above
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Select Spacer Bar:
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Supplier:
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To install an energy rated window
the fabricator/supplier will need to
register their windows with an approved Window Energy Rating Scheme.
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Sightline:
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WER Ratings Calculation
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Sample Window
Style 'L1' : 1.23m wide x 1.48m high
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Energy Index
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WER
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Climate zone
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UK
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kWh/(m2·yr)
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Band Rating
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WER Energy
index
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218.6 gwindow - 68.5 x (Uwindow + Effective L50)
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Solar factor
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gwindow
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Window air leakage
heat loss
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Effective L50
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W/(m2·K)
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Thermal
transmittance
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Uwindow
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W/(m2·K)
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If your company/window is not
registered with an approved Window Energy Ratings Scheme, the window may only
be sold and installed under the self certifying U-value method (check thermal
transmittance above).
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We are pleased to announce that output results generated by
this calculator have been verified and approved by an auditor from the
British Frenestration Ratings Council
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