Frequently asked questions about Cavity Wall Insulation
What is a cavity wall?
The external wall of a house is constructed of two masonry (brick or block) walls, with a cavity (gap) of at least 50mm between. Metal ties jam the two walls together.
How is cavity wall insulation installed?
The cavity wall is injected with insulating material by drilling holes in the external wall through the mortar joint. Holes are generally of 22-25mm diameter and are 'made good' after injection. Each hole is injected in turn, starting at the bottom.
How long does it take?
Cavity wall insulation normally takes around two hours to install, but the time does depend on the size of the house and other factors, such as access.
Is my home suitable for cavity wall insulation?
Before the installation Titan Insulation will undertake a survey of your home to confirm that it is suitable for cavity wall insulation. This assessment may be undertaken by a surveyor or the technician before installation.
Do I need to do anything before the installation?
The drilling process does create some degree of vibration - so it would be wise to remove ornaments, particularly on external walls, for their safety and your peace of mind.
The technician will need access to all walls, so he will need to get inside attached garages lean-to sheds, conservatories etc. The insulation can only be really effective if all walls are insulated. If you have a wall right on the boundary you should mention to your neighbour, that the installation technician may need to go onto their property.
Is there much mess created?
The drilling process inevitably creates a little dust which will be cleared at the completion of the job. It may be wise to remove vehicles from the drive and objects close to the walls. This will also give the installation technician better access for equipment and tools.
Does the installation technician have to come into the house?
Titan's technicians must undertake checks before and after installation, including any heating appliances, so it is essential that they have access inside the property. Apart from these checks, all the remaining work is undertaken from the outside.
My house is semi-detached, so how do they stop insulation going into my neighbour's cavity?
Assuming your neighbour's house is not already insulated, the installation technician will insert a cavity barrier at the party wall line. This is usually a length of bristle brush. Of course, if the neighbour's house were to be insulated at the same time, the cavity barrier would not be needed.
Are all systems of insulation the same?
There are several different types of insulation available. We have chosen Cosytherm Whitewool and Ecobead because they are both highly effective and quick and simple to install. Note: Whitewool is often referred to as 'mineral wool'.
All systems of CWI (Cavity Wall Insulation) have been tested, assessed and approved by the British Board of Agrément (BBA) or the British Standards Institution (BSI). All systems have a similar insulation value. Whichever system you decide upon, Titan Insulation offer a guarantee.
Are Titan's installation technicians trained?
All technicians (team leaders) undergo training by the system supplier and Titan to ensure they are competent in CWI and carry a training card. Please feel free to ask to see the training card.
How do I know that the cavity walls are full?
Each system has a defined pattern of holes, which has been tested to verify that it results in a complete fill. Most systems have an automatic cut out, which actuates when the adjacent wall area is full. There is tolerance in the injection pattern so that the material will flow past the next injection hole.
Is cavity wall insulation dense?
No, as the insulation is contained within a masonry wall, it doesn't need to be 'dense' for insulation and other purposes,
a light density is better. Before installation, our installation technician will undertake a quality test to ensure the insulation will go into the wall at the right density. He will also note the amount of material used, to know that sufficient insulation has been installed in the cavities.
What about the ventilators that are in the external wall?
Ventilators supplying combustion air to fuel burning appliances must be safeguarded. Similarly ventilators at ground level that ventilate below timber floors must be safeguarded. Our technician will investigate them to check they are already sleeved. If they are not, the technician will remove them and seal around them to stop them being blocked by the insulation. Other vents which may be redundant, such as cavity vents or vents that used to supply air to open fires in bedrooms may be closed off . The installation technician should discuss these with you. Redundant air bricks may be filled.
What about filling in the holes?
Our technicians will fill all the injection holes with mortar. To match the existing walls as closely as possible he will use a mix that closely matches the existing colour and texture. On pebble dash finishes, he will apply pebbles to the surface to
match the existing finish. After weathering, the holes are difficult to see.
But my house has painted areas?
Normally, Titan do not paint the injection holes. Unfortunately, even if the original paint is used, it may not match due to weathering. So it may be necessary for you to consider painting the area, after the mortar has dried.
Will my house be warmer?
Yes - if your heating is not controlled by a thermostat. However, if you have a thermostat, it will cut out the heating at the same temperature, so you may not notice the difference in the room with the thermostat. However, you should find that the temperature in other parts of your house improves, for example, the small bedroom on the corner.
With cavity wall insulation you should find that the house holds its temperature for longer and therefore the time between heating cycles may be longer. The result should be a more even temperature throughout the house and/or a reduced fuel bill.
Are there any maintenance or servicing requirements?
No, not to the cavity wall insulation but normal building maintenance is required.
How long will the insulation last?
For the lifetime of your property.
If I am concerned after the installation, what should I do?
Talk to us first and inform us of your worries. A contract exists between you and us as the the installer, so we need an opportunity to investigate your worries.