How Much Attic Insulation Do You Need?

Matt Keane
October 8, 2023

Are you dreading those nippy Irish winters sneaking into your cosy quarters through under-insulated attics? We understand that it can get a tad puzzling to know just the right amount of insulation to install.

But don't worry; we've done our homework, so you won't have to! This article will walk you through how to perfectly insulate your attic in Ireland while bearing in mind local weather conditions and adhering to SEAI regulations.

Ready for lower energy bills and a snugger home? Let's crack on then, shall we?

Key Takeaways

  • Attic insulation is important for improving energy efficiency in homes in Ireland, as it helps prevent heat loss and reduce reliance on heating systems.
  • The recommended thickness of attic insulation in Ireland is 200mm between the joists and across the joists, with a current standard of 300 mm, or 12".
  • The cost of attic insulation in Ireland can vary depending on factors such as the type of insulation chosen, with average prices ranging from €20 to €40 per square metre.
  • It's important to contact professionals for a free quote on attic insulation costs to ensure you have enough insulation for your home.

What is Attic Insulation?

Attic insulation is a material installed in the attic space of a home to reduce heat loss and improve energy efficiency. It acts as a barrier, preventing warm air from escaping through the roof while keeping cool air inside during warmer months.


Attic insulation is a special material put in the attic. It helps to stop heat from going out of your house. When it gets cold, this can keep you warm. In summer, it stops heat from coming inside the house.

Furthermore, this way, your home stays cool and comfortable all year. Attic insulation helps save energy and lower bills for heating and cooling homes in Ireland.

Importance for Energy Efficiency

Having proper attic insulation is incredibly important for improving energy efficiency in your home. In Ireland, where the weather can be unpredictable and cold for a significant part of the year, ensuring that your attic is well insulated can make a big difference in reducing heat loss and keeping your home warm.

Attic insulation acts as a barrier between your living space and the roof, preventing heat from escaping through the roof and cold air from seeping into your home. So, this means that you won't have to rely as heavily on heating systems to maintain a comfortable temperature, which can lead to significant energy savings and lower utility bills.

Plus, with better energy efficiency, you'll also be reducing your carbon footprint and contributing towards a more sustainable environment. So investing in quality attic insulation is not only beneficial for your comfort but also for the planet.

Overall, having sufficient attic insulation can significantly improve energy efficiency by preventing heat loss and reducing reliance on heating systems. Furthermore, this not only keeps your home warmer but also saves you money on utility bills while helping to protect the environment.

Factors for Determining How Much Attic Insulation You Need

When determining how much attic insulation you need in Ireland, there are several factors to consider.

Location (Ireland)

Ireland, known for its unpredictable weather, requires adequate attic insulation to combat heat loss and maintain energy efficiency in homes. The recommended thickness of attic insulation in Ireland is 200mm between the joists and 200mm across the joists.

So, this ensures a sufficient barrier against temperature changes, keeping your home warm during cold winters and cool during hot summers. It's important to note that the current standard set by SEAI for attic insulation in Ireland is a depth of 300 mm, or 12".

Furthermore, by increasing the thickness to the recommended level can improve your home's BER rating and result in long-term energy savings. Whether you plan on using your attic as extra living space or just for storage, proper insulation will help keep your house comfortable year-round.

Size of attic

The size of your attic is an important factor in determining how much insulation you need. In Ireland, the recommended thickness for attic insulation is 200mm between the joists and 200mm across the joists.

Modern guidelines suggest placing a 150mm layer of insulation between the timber joists in the attic floor and another 150mm layer on top. Furthermore, increasing your attic insulation to the recommended thickness can improve your home's BER rating and help reduce energy consumption.

Types of insulation

There are different types of insulation that you can use for your attic in Ireland. One common type is spray foam insulation, which is effective at sealing any gaps or cracks in the attic.

Another option is mineral wool insulation, which provides good thermal and acoustic properties. Rigid foam board insulation is also popular and offers high levels of thermal resistance.

Additionally, sheepswool insulation is a natural and eco-friendly choice. Each type of insulation has its own benefits, so it's important to consider factors like cost, effectiveness, and environmental impact when choosing the right one for your attic in Ireland.

Recommended Thickness and Cost of Attic Insulation in Ireland

The Attic insulation recommending a minimum thickness of 300mm. The cost of attic insulation in Ireland can vary depending on the type and quality of insulation chosen, with average prices ranging from €20 to €40 per square metre.

Average cost range in Ireland

The cost of attic insulation in Ireland can vary depending on different factors. Furthermore, these include the size of your attic, the type of insulation you choose, and the labour involved. On average, homeowners can expect to spend between €300 and €1,500 for attic insulation in Ireland.

However, it's important to note that this is just a general range and actual costs may vary. To get a more accurate estimate for your specific situation, we recommend contacting a professional who specialises in attic insulation.

They can provide you with a free quote based on your needs and requirements.


In conclusion, it is important to have the right amount of attic insulation in Ireland. The recommended thickness is 200mm between the joists and across the joists. Increasing the insulation thickness can improve energy efficiency and lower heating and cooling costs.

Additionally, proper attic insulation can enhance your home's overall comfort, prevent moisture problems, and extend the lifespan of your roofing system. So, contact our professionals for a free quote on attic insulation costs to ensure you have enough insulation for your home. Ready to optimise your home's energy efficiency? Get in touch with us today and make the best investment for your home's future!

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