Cavity Wall Insulation
Did you know up to 35% of the heat produced in the home is lost through the walls if they aren´t properly insulated?
By insulating the cavity walls in your properties you can help reduce your residents fuel bills and save them on average around £130 - £160 per year plus reduce their carbon emissions and thus achieve your Decent Homes, fuel poverty and climate change targets; a win win situation.
Cavity wall insulation helps to create an even temperature around the home, prevents condensation on the walls and ceilings and can also help to keep the home cooler during the summer months.
Technical
Having cavity wall insulation installed couldn´t be easier. It is normally applied from the outside through small holes approximately the size of a 50 pence piece which are drilled approximately 1.5 metres apart all across the external walls. The insulation material is then injected through the holes, filling the cavity. The holes are then filled in to make as perfect a match as possible with the existing wall.
The main insulation materials used are glass or mineral fibre that is chopped up and blown into the cavities. Some installers use Bonded bead (white polystyrene beads) and Urea formaldehyde foam (white foam). All systems have been tested, assessed and approved by the British Board of Agrément or the British Standards Institution. The installer can confirm to you what products they use.
The material is guaranteed for 25 years against any defects by the Cavity Insulation Guarantee Agency (CIGA).
Please note that if the property was built before 1935 the walls may not have a cavity or they may not be suitable to insulate.
Similarly, if your home was built from 1989 onwards, it was required to be insulated under the Building Regulations at the time of build. This may be with modern insulation or with Thermal Blocks. There is no funding available for cavity wall insulation for post 1989 properties through the CROSS Funding Partnership.
Installation
The insulation takes 3 - 4 hours to install.
Before the installation, the installer will undertake a survey of the property to confirm that it is suitable for insulation.
A series of small holes will be drilled into the external walls of the property. Please note the drilling process can be quite noisy, generate a small amount of dust and create some vibration in the walls.
The insulation material is blown via a nozzle into the walls. All materials we use are non-hazardous to health, do not emit any smell, and are fully approved by the British board of Agrément.
Once the filling process is complete, our installers will re-mortar and finish the small holes making every effort to match the existing walls.
If airbricks or air vents are present in the external walls, our installers will ensure that they are sleeved to maintain their operation. Where they are not sleeved, a new sleeved air brick/vent will be installed. Redundant air brick/vents will be sealed using mastic.
If the property has any gas or solid fuelled appliances, the installer will need to check the safe operation of these appliances before and after the cavity wall insulation is installed. The surveyor will advise if ventilation is required.
Once all of the work is complete, our installers will sweep up surplus debris. Please note it is unavoidable if some dust is left behind, although this will dissipate eventually.
Depending on the type of heating appliances in the home it may be necessary to install a permanent ventilator to the outside if none already exist to ensure there is adequate ventilation, usually where there is a working solid fuel appliance and in some types of gas and oil fires.
The surveyor will always advise whether or not any additional ventilation is required. Where additional ventilation is considered necessary this will typically involve the fitting of one or more plastic 9" x 6" air vents and the surveyor will advise where the vent(s) needs to be installed.
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