Guide written by:
Julie, Interior Designer, Manchester
In the UK, households are just behind transport as the second biggest contributors of greenhouse gases. The average household emits 2.7 tonnes of CO2 every year and approximately two thirds of all homes in the UK are poorly insulated. In terms of energy efficiency, a good heating system needs to be paired with high-quality insulation – there is no point in having a top-of-the-range heating system installed if you are losing heat through poor insulation.
Around 10 to 15% of heat in the home escapes through glazed surfaces. If you're in the process of renovating, you have the option to change your glazing but keep the window frame which will lower costs but may reduce window size and therefore the amount of light allowed in. Alternatively, you can replace the whole window which will improve thermal and acoustic performance even further.
Choose between standard double glazing, low-emissivity glass (which features an invisible microscopic coating for improved thermal efficiency) and triple glazing. It's worth noting that the lower the heat transfer coefficient (in Uw), the better the insulation.
When it comes to choosing an efficient front door, you need to first think about material: PVC is cost-effective and efficient; aluminium is known for its energy efficiency; and wood is naturally insulating but does require maintenance. If your front door is glazed or partially glazed, it should be fitted with double or triple glazing.
Pay close attention to the U value of a front door – the lower the value, the more insulating the door. Look out for air permeability ratings (classed 0 for no test up to 4 for the highest performance), water tightness ratings (ranges from Class 0 to Class 7A) and wind resistance (VA1; VA2; VA3; VA4; VA5).
Your roof can be responsible for up to 30% of overall heat loss in the home. Three main methods can be used to insulate a roof terrace as part of renovation work:
If you're looking to insulate a warm loft – meaning a habitable attic space – you have two solutions:
A cold loft is an uninhabited, unheated loft which must be insulated from the rest of the house to prevent heat loss. Insulating your roof space is the most effective way to improve the energy efficiency of your home and you may be eligible for free loft insulation if you have no existing insulation.
You can choose between:
Walls represent about 20 to 25% of overall heat loss in the home. Insulating your walls will improve the efficiency of your home as well as limiting the cold wall effect. In turn, this helps to reduce moisture, enhance comfort and reduce bills. Several options are available:
Floors lose a considerable amount of heat and are thought to account for about 7 to 10% of overall heat loss. Two different insulation methods can be used for flooring:
Insulation can be divided into three broad categories.
Glass wool, made of a mix of sand and recycled glass, comes in all forms and is a highly insulating material. Rockwool is made using basalt fibres and has a really long lifespan. Another option is perlite, the strength of which means it works well for insulating ceilings and roofs. Vermiculite is perfect for lofts and floors. Cellular glass is a recycled material used for walls and roof terraces.
Natural insulation is made, as the name suggests, using natural materials while bio-based insulation is made from materials derived from plant or animal biomass. This type of insulation helps to reduce greenhouse gases. The main types of natural insulating materials include wood and wood-based products, straw, hemp, flax, cotton, cork, coconut fibre, sheep wool and duck feathers.
While not too expensive and highly efficient, synthetic insulation is derived from petrochemicals. Polyurethane is water- and compression-resistant and highly insulating. Extruded polystyrene boasts excellent thermal performance and is relatively thin. Expanded polystyrene is cost-effective and versatile. Phenolic foam is thin and fire-resistant.
Guide written by:
Julie, Interior Designer, Manchester, 40 guides
After years of DIY, renovation and designing, I decided to turn my passion into a career. Starting in 2006, in the South-West, I helped people with renovation or construction projects. My expertise and curiosity led me to look further into innovative ideas for myself and my clients. Indeed, to live your passion is also to transform the space you live in and the objects you use daily. My family love my creations and ideas that I bring into their lives! My favourite thing to do: use colour to brighten up interior space. But also tips to hide away clutter. Your home is just never big enough, is it? It is therefore a great pleasure to share my tips with you, so that you also can take as much pleasure as I do when starting up your next project!