Loft insulation FAQ

Q. What is loft insulation?

Loft insulation can be any kind of insulation that is installed in the loft space of a building to help prevent heat loss through the roof. There are four basic types of insulation: matting (also known as blanket or quilt insulation), loose-fill, blown and rigid insulation boards. As such, there is a type of insulation suitable for most properties.

Q. Why have loft insulation fitted?

Up to 25% of the heat generated in the average home can be lost through your loft space if it is not properly insulated. By fitting the governmental recommended depth of 270mm of insulation in your loft, you could save up to £175 and around 720kg of CO2 every year*.

*According to the Energy Saving Trust website, Jan 2013.

Q. Does the loft need to be clear for insulation to be fitted?

In order for the technicians to access all areas of your loft, it needs to be no more than 10% full. However, we can clear the loft for you at an additional cost.

If you have a boarded area in the loft that you do not wish to remove, it is standard practice to lay the insulation over the boards. This does however mean that you will no longer be able to use your boarded area for storage.

Q. Does anything else need to be done prior to installation?

To make the installation as quick and simple as possible, we advise that customers turn off the heating two hours prior to the insulation being fitted. This is to allow time for the property to cool down, which makes it safer for the technician to work in your loft and fit any hot water tank jackets or pipe insulation that may be required.

Q. How is loft insulation fitted?

If your loft has easy access, regular joists and some existing insulation already, the new insulation material is laid between the joists and then cross laid over the top to achieve the recommended depth. However, if your loft does not have any existing insulation the matting we fit will not be cross laid. Instead, the required thickness of mat will be cut so that it tightly fits the joists beneath, in order to avoid voids or waving. Any pipes and tanks which require insulation are then insulated, along with the loft hatch if necessary.

Q. How long does it take to install?

It takes just a couple of hours for the average property to have loft insulation fitted.

Q. Will fitting loft insulation cause a mess?

Our technicians are trained to make as little mess as possible when installing loft insulation. Dust sheets can be laid down along the route the workmen will take to access your loft to protect your flooring, and any packaging they use will be taken with them when they leave.

Q. Will the insulation interfere with the ventilation in the loft?

In order to allow adequate ventilation in your loft, the ventilation will be fitted at a suitable distance away from the eaves. If possible, vent wedges are also fitted to aid the circulation of air in the loft.

Q. Will the insulation affect any wiring in the loft?

All high voltage cables will be lifted where possible. If this cannot be achieved, a 75mm channel will be created around them. It is, however, perfectly safe to cover normal household wires.

Q. Can I use my loft for storage after insulation?

Once the loft has been insulated, the joists will not be visible and walking in the loft could be dangerous. As such, we recommend that you do not access your loft without the use of crawl boards and knowledge of the exact position of the joists. However, at an extra cost, Domestic and General are able to raise the joists in your loft before the insulation is installed in order to fit boards for storage.

Q. My loft has poor access; can it still be insulated?

If your loft has poor access, for example if your hatch is too small to access or you are unable to reach the existing entrance, Domestic and General are also able to fit new loft ladders and hatches for an additional charge. This means that you will not miss out on the benefits of having insulation fitted in your home.