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Loft Project Buying Guide

Loft Project Buying Guide

Keep your home warm and energy-efficient all year round with our loft insulation, then maximise the storage space in your loft with a ladder, lighting and storage boxes.

Specifically designed for use at ceiling level in between the joists, Knauf Insulation Space Loft Roll is the perfect way to insulate your loft.

Made with Knauf Insulation’s ECOSE® technology, our loft roll is easy to handle, environmentally friendly and will produce low levels of dust, making it the ideal choice for your loft project. It is also made with up to 80% recycled material.

The benefits of insulating your loft

Reduce heat loss and improve energy efficiency

Reduce your heating or cooling bills

Reduce the transmission of external noise

Quick to install and maintenance free

Produce less carbon and save the environment

The benefits of insulating your loft

Insulating your loft is one of the most effective ways to keep the heat in during the winter. We recommend a minimum 270mm thickness for loft insulation, but the thicker the better! Homes without insulation could save up to £225 and 620kg of carbon dioxide a year by installing 270mm of insulation.*

How many loft rolls do I need for my space?

Knauf Insulation Space Loft Roll is available in three different thicknesses - 100mm, 170mm and 200mm. UK building regulations require 270mm of mineral wool insulation at ceiling level in a loft so the most common way of achieving this is through 100mm in between the joists and 170mm cross laid on top.

However, increasing the thickness of insulation maximises energy efficiency. New build properties typically use 400-500mm of loft insulation. This is achieved by using 3 layers of insulation; one base layer (100mm) lengthwise between the joists and super top-up (200mm) layers laid at right angles to the joists.

To achieve maximum performance, insulate with 500mm of Space Loft Roll.


Knauf Insulation 100mm Bottom Layer Loft Roll - 11.08m²

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Knauf Insulation 170mm Standard Top Up Loft Roll - 6.47m²

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Knauf Insulation 200mm Super Top Up Loft Roll - 5.61m²

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What you'll need to board your loft

Learn how to insulate your loft


How to insulate a loft

Loft insulation is an effective way to reduce heat loss and save on your fuel bills. We’ll show you how to fit loft insulation rolls, plus how to insulate pipes and cold-water tanks.

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How to prepare your loft for storage

Your loft is the perfect out-of-sight storage space for your suitcases, Christmas decorations and those other bits and pieces that have no other home.

Learn more

*Information provided by Energy Saving Trust. Based on a typical three-bedroom semi-detached gas heated house, with an 88% efficient gas boiler and average gas tariff of 6p/kWh and electricity tariff of 24.5p/kWh. Emission savings include all scopes and greenhouse gases expressed as carbon dioxide equivalent.

Correct as of April 2024.