product-utp-content-image

Achieving Nearly Zero Energy Building Standard

Building to the higher ‘A2’ (Nearly Zero Energy Buildings target) or Passive Standards, CavityTherm in a traditional cavity wall with a 150mm cavity will get you there!

NZEB Solutions - Semi detached Scheme Development

ElementU-values (W/m²k)
Floor0.11
Cavity0.16
Ceiling0.12
Windows1.40
Door1.00
Thermal BridgingY=0.04
Air Permeability5

NZEB Solutions - Detached: Self Build

U-valueUnit (W/m²k)
Floor0.11
Cavity0.13
Ceiling0.12
Windows1.40
Door1.00
Thermal BridgingY=0.02
Air Permeability5

CavityTherm is not unique amongst Xtratherm products
in delivering thermal performance beyond simple U-values.

The Xi product range that includes walls, floor and roof products deliver not only the U-value requirements
for Passive standards, but are also critical in the detailing required to reduce thermal bridging heat loss.

Floors - 0.12 W/m²K
Walls - 0.15 W/m²K
Roof - 0.15 W/m²K

Below we show a self-build project (simplified to allow junctions to be identified).
Lets look at how the specification needs to be improved to compensate for poor detailing.

 product-utp-table-house-1
y = 0.03 (Thermally Modelled Junctions)
The equivalent of an open ‘Window’ 1.25m x
1.25m (1.56m2) opening.
product-utp-table-house-2
y = 0.08 (Acceptable Details)
The equivalent of an open ‘Patio
Door’ 2.1m x 1.8m (3.78m2)
product-utp-table-house-3
y = 0.15 (DEAP Default)
The equivalent of an open ‘Garage
Door’ 2.1m x 3.3m (6.93m2) opening.
Y-value 0.03 using Xtratherm
Xi range with approved PSI values - within Acceptable details and calculated.
Y-value of 0.08 based on the use of Acceptable Details but not calculated by the Assessor.No particular detailing specified or witnessed
Default value
Y-value0.030.080.15
Details UsedAcceptable DetailsAcceptable DetailsUnspecified / or
-DOEDOEWitnessed Details
Front Door1.51.5
Glazing1.151.15
Permeability53
VentilationNaturalMV
Space Heating PrimaryOil - 94.8%AW UFH
Space Heating SecondaryStove - WoodStove & Immersion
Water Heating6m Evacuated TubesRemoved
EE Lightning100%100%
RenewablesAir to Water Heat Pump
Energy kWhr/m²/yr59.3960.50
CO² kg/CO²/m²/yr13.5612.71
CPCPassPassFail
EPCPassPassFail

Do you have any questions?

Tale to the team who can help you with your project

Our Technical Team provides technical services throughout our customer bases in Ireland & UK. Their experience and expertise has been built through our engagement and participation with the Irish construction industry for over 30 years.

Certified Technical Knowledge.

Solutions you can trust.

Call The Technical Team:
Tel +44 (0) 371 222 1055
Tel +353 (0) 46 906 6050

NSAI Logo
BBA Cert Logo
Brochures

Learn more about CavityTherm.

Certs & DOPs

See facts & figures on how CavityTherm performs.

ACDs (CAD)

Download CAD files of all CavityTherms Accessories.

Packing Lists

Get size and dimension specifications.

ACDs (PDF)

Acceptable Details for Construction (ACDs).

BIM Files

Download BIM objects of all CavityTherms Accessories.

Callback Request

Fill in your details below and we will contact you!
×