- #Windows on top of interior walls install#
- #Windows on top of interior walls software#
- #Windows on top of interior walls windows#
#Windows on top of interior walls windows#
This will be most effective with inward opening (tilt and turn) type windows as the external face of the frame will be larger than the inside. If you are using external wall insulation, then you want to bring the external insulation over the face of the frame.Credit: Gil Schalom, GSD Architecture Ltd Īs far as is possible, to minimise any thermal bridge, we should think about bringing the insulation over the face of the window frame, effectively ‘wrapping’ part of it in insulation. The installed thermal performance was maximised by pushing window frames all the way into the EWI, where it is fixed on to the exterior of the cavity wall. Kingsley Passivhaus retrofit window installation detailing with external wall insulation.
#Windows on top of interior walls software#
To be sure of your details they can be modelled in thermal modelling software such as Flixo or Therm to establish the thermal bridge Psi values, something that will certainly need be done if you are working to the Passivhaus retrofit standard. If space is tight we may need to use specialist insulations with particularly good insulation values, such as Aerogel or Vacuum Insulated Panels. This might mean using extra insulation on the window reveals. However, there are still things we can do to improve the installation. Sometimes we have no choice about the positioning of the window. By contrast, a really well-detailed triple glazed window can actually improve on the Uw value of the window itself. If you are installing a good triple glazed window (eg Uw value around 0.8 W/m 2K), with bad installation details then the overall heat loss of the window can be doubled to an effective installed Uw value of 1.6 W/m 2K or more. If you pay careful attention to the window installation details then you should avoid any mould growth and also get the most from the investment in high performance windows and doors.
#Windows on top of interior walls install#
No one wants to install new high performance windows only to have black mould developing on the reveals! This wastes energy but also leads to the risk of condensation and mould growth on these cold areas. If you position windows and doors within non-insulative construction layers, such as stone or brick walls, you will create a thermal bridge where heat can escape. Windows generally perform best when located within the insulative wall layer. This will minimise thermal bridging and optimise the value of insulation measures. We need to aim for a continuous line of insulation around the house with a minimum of gaps in or penetrations through the insulation layer. Windows and doors are usually the weakest point in the insulation envelope, as well as potentially one of the worst areas for thermal bridging, so a lot of care is needed when installing windows into an existing home. Window reveal with VIPs insulation at Cumberworth radical retrofit to reduce thermal bridging Airtightness product information & price list.