How to Insulate Your Loft

Matt Keane
June 14, 2023

Have you considered your loft? There’s nothing like a cold, draughty home in the middle of an Irish winter. A poorly insulated loft can result in substantial heat loss, hiking up your energy bills. This comprehensive guide on ‘how to insulate your loft’ will answer your questions, ensuring you can enjoy a warm, cosy home while saving on energy costs.

Understanding Loft Insulation

Insulating your loft is about laying insulating materials in your loft space. This helps reduce the heat escaping through your roof, thereby improving your home’s energy efficiency. Let’s first dive into the basics.

Why Loft Insulation Matters

Around 25% of the heat in your home can be lost through the roof if your loft isn’t adequately insulated. That’s a quarter of your heating bills wasted! Insulating your loft is an effective way to save energy and reduce your bills, but it’s also an essential step towards making your home more environmentally friendly.

At BuildTech, we are committed to providing Ireland’s highest-quality construction services. Our professional team can ensure your loft insulation is installed efficiently and safely.

Steps to Insulate Your Loft

Learning how to insulate your loft can seem daunting, but it doesn’t have to be. We’ve broken down the process into straightforward steps to guide you.

Assess Your Loft Space

Start by examining your loft. What type of roof does it have? Is it a pitched roof or a flat roof? The type of roof will determine the insulation method best suited to your needs.

Choose the Right Insulation

Loft insulation comes in several forms: blanket insulation, loose-fill insulation, sheet insulation, and blown-fibre insulation. Each has pros and cons, and the right choice will depend on your home’s requirements.

Install the Insulation

Depending on the type of insulation chosen, the installation process will differ. In most cases, it involves rolling out the insulation material across the loft floor, ensuring no gaps or draughts. This process requires precision and expertise, so hiring a professional service like BuildTech is best.

How Much New Loft Floor Insulation Is Needed?

One of the most critical questions to answer before beginning a loft insulation project is: how much insulation will you need? The answer depends on several factors, including the size of your loft, the type of insulation you choose, and the current level of insulation, if any.

Measure Your Loft Space

Begin by measuring your loft space. Take the length and breadth of the area to find the square footage. The size of your loft will be a determining factor in how much insulation material you’ll require.

Type of Insulation

Different types of insulation cover other areas. For instance, one roll of blanket insulation, the most commonly used type of loft insulation, typically covers around 10-15 square metres. If you’re using loose-fill or blown-fibre insulation, you will need to check the coverage information provided by the manufacturer.

Existing Insulation

If you already have some insulation in your loft but are looking to top it up, you’ll need to measure the depth of the existing insulation. The recommended total depth for loft insulation is 270mm. If your current insulation falls short of this, you’ll need to make up the difference with the new insulation.

Calculating the Quantity

Once you have these measurements, you can calculate the insulation needed. Multiply the length by the breadth of your loft to get the area in square metres. If you’re topping up, calculate the difference in depth needed to reach the recommended 270mm and convert it into metres.

It’s advisable to buy slightly more insulation than your calculations suggest to account for any measurement errors and areas where you might need a bit more material, such as corners.

Professional Loft Insulation with BuildTech

If you’re looking for top-notch loft insulation services in Ireland, look no further than BuildTech. Our team of skilled professionals has the experience and expertise to provide you with high-quality insulation that will last for years.

Tailored Insulation Solutions

At BuildTech, we understand that every home is unique. That’s why we offer tailored insulation solutions, taking into account your home’s specific needs and budget.

Efficient and Safe Installation

Safety is paramount at BuildTech. Our experienced team ensures that your insulation is installed efficiently and safely, adhering to all safety regulations and guidelines.

Sustainable Insulation Options

We provide eco-friendly insulation options in line with our commitment to sustainable construction practices. These materials not only help in reducing your home’s carbon footprint but also offer excellent thermal performance.


Properly insulating your loft is critical to a warm, energy-efficient home. While it’s possible to do it yourself, hiring a professional service like BuildTech ensures that the job is done right the first time. After all, your home deserves nothing but the best!

Remember, how to insulate your loft shouldn’t be a question anymore. Reach out to BuildTech today, and we’ll guide you through the process, offering the best insulation solutions for your home. Let’s create a more comfortable and energy-efficient living environment together.

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*FYI, parts of this blog post were drafted by artificial technlogy. But rest assured, it's been thoroughly researched, edited, reviewed and me & my team.
Founder @ BuildTech

Matt Keane is the Author of BuildTech, a home improvement specialist that offers design and build services for residential and commercial projects. Matt has expertise in the construction industry and is passionate about creating sustainable and energy-efficient buildings. He is also an expert in retrofitting, solar power, and also in insulation.

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