When it comes to improving the energy efficiency of your home, knowing where to put insulation can make a significant difference. Proper insulation reduces heat loss, lowers energy bills, and makes your living environment more comfortable. 

Whether you’re building a new home or upgrading an older one, focusing on key areas can yield significant benefits. Here we explore the most beneficial areas for home insulation and how you can maximise its impact.

Exterior Walls

Exterior walls are one of the primary areas where homes lose heat. By insulating your walls, you can prevent warm air from escaping in winter and keep cool air inside during summer. There are three main types of wall insulation to consider:

  • Cavity Wall Insulation: Ideal for homes with cavity walls, this method involves injecting insulation material into the space between the inner and outer layers of the wall.
  • Solid Wall Insulation: For homes with solid walls, external or internal insulation can be applied. While more costly than cavity insulation, it significantly improves thermal efficiency. External wall insulation offers the further benefits of improving your home’s exterior appearance and doesn’t reduce the size of your rooms the way internal wall insulation does.

Wall insulation can reduce energy costs by up to 35%, making it one of the most impactful upgrades.

The Roof and Loft

Your roof is another major source of heat loss, accounting for up to 25% of a home’s energy wastage if left uninsulated. Loft insulation is a cost-effective way to trap heat where it’s needed. There are several options:

  • Blanket Insulation: Made from fibreglass or mineral wool, it’s easy to roll out and suits most lofts.
  • Loose-Fill Insulation: Useful for filling gaps or hard-to-reach areas.
  • Spray Foam Insulation: Excellent for sealing cracks and crevices, ensuring no heat escapes.

For homes with flat roofs, insulation can be installed above or below the roofing material. Insulating your roof also reduces condensation problems, further improving your home’s energy efficiency.

Doors and Windows

Draught-proofing doors and windows is a simple yet highly effective way to improve insulation. Gaps around frames can lead to significant heat loss, so sealing them with weatherstripping or silicone caulk is essential.

Additionally, upgrading to double or triple glazing can enhance thermal efficiency. These window types contain layers of insulating gas between the panes, minimising heat transfer. They not only keep your home warmer in winter but also reduce external noise, making your living space more peaceful.

Floors

Floor insulation is often overlooked, but it can be a game-changer, especially for homes with suspended timber floors. Heat can escape through the gaps between floorboards, causing drafts and making heating systems work harder. Solutions include:

  • Underfloor Insulation: Adding rigid foam boards or mineral wool beneath the flooring can drastically reduce heat loss.
  • Floor Coverings: Rugs and carpets offer an extra layer of insulation and add comfort.

For homes with concrete floors, insulating above the slab is a viable option, particularly during renovation projects.

Garages and Outbuildings

Garages and outbuildings often go uninsulated, yet they can benefit greatly from insulation, especially if they are used for more than storage. If your garage is attached to your home, insulating it can prevent cold air from seeping into adjacent rooms.

For outbuildings used as workshops, studios, or for storing temperature-sensitive items, such as tools or garden supplies, insulating walls, roofs, and doors is essential. Using insulated garage doors and draught-proofing gaps can help maintain a stable indoor temperature.

Pipes and Tanks

Insulating your water pipes and hot water tank is another effective way to conserve energy. Pipe insulation prevents heat loss and reduces the risk of freezing in colder months, while a tank jacket can keep your hot water hotter for longer, reducing the energy required to reheat it.

 

Knowing where to put insulation is key to improving your home’s energy efficiency and comfort. Start with the biggest heat loss areas—walls, roofs, and floors—then move to smaller upgrades like draught-proofing doors and windows. Don’t overlook garages and outbuildings, as they too can benefit from proper insulation. With these steps, you’ll create a more sustainable and cost-efficient living space while enhancing your overall quality of life.

If you are ready to install external wall insulation in your home, please get in touch and see how we can help.

FAQs

How do I know if my home needs insulation?
Look for signs such as high energy bills, uneven room temperatures, draughts, or cold walls and floors. An energy audit can also help identify areas needing insulation.

What is the best type of insulation for exterior walls?
Cavity wall insulation is best for homes with cavity walls, while solid wall insulation works for older properties. Consult a professional to determine the most suitable option.

Is it worth insulating my garage?
Yes, especially if your garage is attached to your home or used for activities other than storage. Insulation can help maintain a stable temperature and prevent heat loss.

How often should insulation be replaced?
Most insulation lasts for decades, but you should inspect it every few years for signs of wear, moisture damage, or pests.

Can I insulate my home myself?
Some types, like loft insulation or draught-proofing, can be DIY-friendly. However, for complex tasks like wall or roof insulation, it’s best to hire a professional.