Online Insulation Ltd is an online distributor of low cost, high quality building insulation and drylining for the construction industry and DIY markets.

How to insulate a loft

To provide a useable space

Most importantly, before embarking on a project such as a loft conversion, you must employ an architect who will advise on the technical specifications. Once your architect has produced detailed drawings you can source a builder to complete the work. To create a habitable room in your loft, first, it is worth considering that if your loft is currently used for storage only (cold loft) there will likely be loft roll which is laid across the joists to prevent heat escaping from your home. To create a new room, you will be changing the loft space to a warm loft.

Loft Conversion Insulation

Regardless of whether you are insulating from the outside, or just from the inside, it is imperative that a double-layer of insulation is used. The type of insulation needed is called PIR, a rigid, foil backed insulation primarily used for roofs, walls and floors. The absolute best way to insulate for a loft conversion is to fit insulation boards over the rafters, but this is only an option on a new build or if renovating and stripping and relaying roof tiles. Therefore, the most used method would be to use the PIR board between the rafters, with an additional layer fixed to the underside of the rafters. Currently, the minimum depth of the PIR board would be 175mm.

Loft Insulation

A quarter of heat from our homes is lost through the roof (if uninsulated) It is an easy solution to reduce heating bills and maintain a warm toasty home. The recommended depth of insulation is between 250mm and 300mm. You can over insulate, and this can cause an issue with damp and moisture. Loft insulation comes in the form of loft roll, a mineral wool, made from recycled glass This can be laid directly over the joists to the required thickness. It is not recommended that this type of insulation is compressed in any way as it can reduce its thermal abilities.

When it comes to loft insulation, our most popular brand is Knauf, a family-owned, multinational manufacturer of building materials and construction systems. Quite easily one of our most popular products is the 100mm Knauf Earthwool Loft Roll 44 Combi Cut – 13.89 m² Pack, this is one of the most cost-effective ways to thermally insulate your home. This form of insulation is made predominantly from recycled glass bonded together with a non-formaldehyde binder, this reduces the environmental impact of the loft roll production by up to 70%. The Knauf Earthwool is also significantly less itchy to traditional loft roll, with some customers even claiming it to be non-itch. This is a plain roll with no facings, however, should you require a paper or foil-faced loft roll, please don’t hesitate to get in touch with us and we can have this manufactured for you.

Here at Online Insulation, our main aim is to bring our customers high-quality products with a professional service that won’t be beaten by our competitors. We are incredibly proud of our outstanding customer service reputation, due to our support and reliability, which we do our best to uphold with every customer we work with. We want all of our customers to be completely satisfied with the loft insulation materials we supply, which is why we offer only honest and accurate information when required.

If you have any further questions or would like any more in-depth information regarding our loft insulation materials, then please don’t hesitate to get in touch with us today. You can call us on 01509 649065 where a member of our customer service team will be more than happy to have a chat about anything you may need. Alternatively, you can head over to our website and fill in our contact form, someone will get back to you in due course.

What is Acoustic Insulation?


Acoustic insulation is one aspect of soundproofing your space; it is typically a component of a floor or wall assembly designed to ensure sound comfort for occupants. Managing the acoustics of a built environment, by its most simple definition, is done by either blocking or absorbing sound

it is becoming increasingly common to install acoustic insulation in at least some internal walls for sound management. It is unlikely that money spent on acoustic insulation within the home will ever be recovered through reduced energy bills. However, it can contribute towards a more quiet and pleasant place to spend time, which is often the reason it is installed in the first place.

Acoustic insulation, (or soundproofing) is all about adding mass, mass and more mass. This helps to stop noise from passing so easily through a structure. The most effective soundproofing solutions don’t just add more of the same mass, they add mass which is comprised of different materials. This is very important, as different materials are better than others at blocking different types of sound.

The other principle in effective soundproofing is to decouple or dampen the building. Sound travels as a vibration when it hits a wall or floor. To prevent sound vibrations travelling through buildings, the vibration needs to be dampened to stop it from travelling through. The most effective way to stop sound vibration energy from travelling through is to decouple the structure and then add mass.

When looking for the best soundproofing insulation, it’s important to recognise that there are various insulation solutions available. One of the most common solutions is sound shield plasterboard, with a further protective option being the sound shield plus tapered plasterboard. Alternative options include Rockwool mineral wood slabs, and partition roll. That being said, the most popular solution currently sold on Online Insulation is the Earthwool Acoustic Roll, a flexible glass mineral wool quilt which promotes sound reduction and general insulation to your property.

In addition to the insulation itself, one of the main approaches, in order to install the best insulation, is the frame around the solution. For instance, our resilient bar works as an acoustic solution to decouple the plasterboard from its substrate, enabling a restriction in the transmission of sound. For installation purposes, they are fitted to the underside of the joists and perimeter noggins on all sides of the room, enabling for complete sound protection from the resilient bars.

If you require a considerable amount of soundproofing insulation, then you will be pleased to hear that we have a wide selection of insulation solutions available to purchase in bulk. Additionally, we have made sure to implement a strong delivery service, where we are able to deliver products within as little as 2-3 working days, as well as offering free delivery on all orders over £300.

In order to purchase the best soundproofing insulation available on the market, look no further than the Online Insulation website when you have the chance. However, if you have any questions or concerns about our services or a specific product, please don’t hesitate to call us on 01509 649065 to speak to our friendly customer service team. If you would prefer to write, we are available via email at, though be sure to include your contact details so that we can reply at the earliest convenience.

Why You Should Insulate Your Loft

Thermal insulation is constantly been used in the construction field due to the numerous benefits it has to offer. Loft insulation is effective for at least 40 years and it should pay for itself many times over. It has been adopted and become essential in the building process to prevent heat transfer between outside and inside of buildings.


Loft insulation works by reducing the amount of heat lost from your roof, as the heat escapes through your roof, both through conduction and convection. One of the most popular methods of loft insulation is by using loft insulation rolls, which are a low-density glass mineral wool material. Having these installed reduces the amount of heat that passes through your ceilings and reaches your loft space to escape through the roof.


Overall, there are a number of different benefits of insulating your loft and we have named just a few.


  1. Reduction in heating costs


One of the most obvious benefits of using loft insulation is the savings on your heating bills, as in uninsulated homes, a quarter of the heat lost wafts out through the roof. As heat rises from your home and into your loft space, it quickly escapes or turns into cooler air, reducing the overall temperature of your home. Overall, loft insulation is an instant and cost-effective way of creating a warmer home and saving those wasted pounds.


     2) You will have fewer problems with condensation

If there is no insulation within the loft, this can often cause problems of condensation appearing on the walls if you are converting the space into a new room within the house. These are the grey spots that are visible on the walls, which are signs of mould with dust particles attached to it due to the surface being damp. Thermal insulation prevents the entrance of outside heat from exterior building walls and ceiling, and the escape of hot or cool air from the interior rooms to outside.


     3) Environmental protection

By insulating your loft, this leads to considerable savings in energy consumption and accordingly fuel consumption. It is one of the main acknowledged ways of reducing carbon emissions output as well as helping to reduce the consumption and reliance of fossil fuels. It has been calculated that the emitted CO2 gases for the heating of an insulated building are as much as 45% less than the ones emitted from a not insulated building – which significantly impacts the environment.

COVID-19 Update

Online Insulation will be opening for certain orders from 04.05.20.

We will be working with reduced staff and limited stock throughout the country and our delivery times will vary from those stated on product details.

During this busy time please email us on if you need assistance.

From everyone at Online Insulation, we wish you the best health

Please note – we are not currently able to answer phone calls or pick up voice mail messages. Please email or contact us via online chat.

COVID-19 Service Update

Due to the Covid-19 virus, Online Insulation is CLOSED During April.

During this busy time please email us on if you need assistance.

From everyone at Online Insulation, we wish you the best health. Please note – we are not currently able to answer phone calls or pick up voice mail messages. Please email or contact us via online chat.