Glasisolatie
The benefits of glass insulation
Most houses in Duinoord have large (sliding) windows, often with single glazing and upper windows with stained glass. These large windows are characteristic of the protected cityscape of our neighborhood, but not very ideal for insulation. Glass easily conducts heat outside. Replacing single glazing with insulating glass results in energy savings of an average of 10 m3 of gas per year per square meter of insulating glass. Furthermore, insulating glass increases comfort, because you are less bothered by cold from the windows and the noise from outside is substantially reduced.
Materials
In most cases it is possible to install insulating glass in the existing window frames. The condition is that the frames are still good. There are various possibilities:
- HR glass This is double glazing with a special coating and filled with an insulating gas that increases the insulation value (HR ). This glass is quite thick (22 mm) and usually has to be placed in the rebate using overlay glazing beads. This can change the appearance of the house and in some cases sash windows can no longer be used.
- Monument glass (HR ) This glass is similar to HR glass, but has a smaller distance between the inner pane and the outer pane. This means that it can be placed in the rebate with some milling work without glazing beads. The appearance and sliding function of the windows are retained. The insulation value of monumental glass is slightly lower (HR ). NB! This glass is not eligible for a subsidy.
- Vacuum glass (HR ) In the case of vacuum glass (consisting of 2 thin glass plates that are kept apart by spacer conductors). With this type of glass, the space between the two glass plates is vacuumed, so that there is hardly any heat conduction from the inside to the outside. Despite a very small total thickness of 7-8 mm, vacuum glass has a high insulation value (HR ) but is more expensive than other types of insulating glass. The advantage of vacuum glass is that it almost always fits into the existing rebates, sometimes without milling.
Stained glass
The stained glass in the upper windows is often the place where the most heat is lost. Something can also be done about this while retaining the existing stained glass. You can work with an additional window or it is also possible to have the existing stained glass in double glazing. Ask the glass company about the possibilities,
No frame replacement
Replacing the frames with new wooden, plastic or aluminum frames is not part of this collective action. Frame replacement is often not necessary, requires an environmental permit and is by definition custom work, often at higher costs. In addition, the frames, often more than 100 years old, are made of the best quality wood, which is no longer available.
For that reason, Triple glass is not part of this promotion. Triple glazing (consisting of 3 panes of glass with a coating and insulating gas) has a high insulation value, but is so thick that the frames also need to be replaced.
Insulation value
The insulation value of glass is expressed in a U-value. This number expresses how well the glass transmits heat to the outside. The lower this number, the better the glass insulates.
The picture shows the effect of the different types of glass. If it is 0 degrees outside and the central heating is set to 20 degrees inside, then single glazing on the inside is cold at only 5.5 degrees, while HR is 18.5 degrees.
The RVO stipulates that the insulating glass must have a U-value of 1.2 or lower (HR or HR ). This also means you meet the standard for home insulation.
Please note: monumental glass (HR ) does not meet these conditions and is not eligible for a subsidy.
Costs and savings
- The costs for glass insulation depend on the glass used:
- HR -glass: € 465 - € 500 per m2
- Monumentenglas: € 465 - € 500 per m2. - Vacuümglas: € 700 - € 750 per m2.
- You receive a subsidy of € 23 per m2 on insulating glass. That amount is doubled if you take 2 measures. If you want to fit the windows of a typical living room in Duinoord (2 sliding windows at the front and patio doors at the back) with insulating glass, it will cost you one-time:
- HR glass: € 6600,-
- Monument glass: € 7000,-
- Vacuum glass: €10,000
- This investment results in gas savings of approximately 150 m3 per year. At current energy prices, this is a saving of €220 per year. Read an explanation of the calculation example here.
With glass insulation, the ratio between costs and savings is less favorable than with other measures. Yet glass insulation is a wise investment. In addition to the gas savings, it provides more comfort in your home, because you are much less bothered by the cold at the windows. In addition, there is less noise from outside and the value of your home will increase. Glass insulation is even necessary if you are considering heating your house at a lower temperature.
Glasisolation Webinar
In this webinar, one of the specialists explains the characteristics and benefits of the different types of insulating glass. The costs, savings and subsidies are explained and we pay attention to the rules regarding permits. You can watch the webinar here.
Glass insulation companies
Isolation measures
> Floor and ground insulation
> Glasisolatie
> Roof or attic insulation
> Isolation
Extra information
> How well should you insulate?
> Insulating means ventilating
> Insulate with the VvE
> Protected cityscape
Subsidies
> Owner/occupant
> HOA
> Landlord
> RVO website
Help and support
> Webinars
> Information market
> Energy coaching
> Subsidy support