How to Insulate Your Loft Floor Without Using Fibreglass

This how-to guide will show how to insulate your loft floor, without the use of mineral wool or fibreglass.

The insulation included in the Loft Floor Insulation Kit is EcoQuilt Expert. This product is a 15mm, 6-layer multifoil with highly reflective foil layers. It is thin, flexible, easy to install, and does not contain any harmful fibres. EcoQuilt Expert is equivalent to approximately 100mm of mineral wool, while only being 6mm thick when compressed.

This how-to guide is based on a single layer of EcoQuilt Expert. If you wish to proceed with the double-layer option, please view our How-To Video for further information.

Ecohome-Insulation are the leading UK & European distributor of Multifoil Insulation products. We offer free next working day delivery to the UK Mainland (on orders over £100 + VAT before 2pm).

Remove Existing Mineral Wool Insulation

Start by removing the existing loft insulation.

Ensure a mask and protective clothing are used to avoid skin irritation.

Installing First Run of EcoQuilt

Measure out the length of material required, then roll EcoQuilt Expert over the joists. EcoQuilt can be simply cut using scissors or a cutting knife, both available in our Multifoil Fitting Kit.

Ensure the second run of EcoQuilt is overlapped by 50mm when installed.

Recess and Staple EcoQuilt

Staple EcoQuilt on both the top of the joists and on the sides when recessing. The benefit of recessing is to create a cavity without the use of a batten — when a cavity is formed, optimum performance is gained from the insulation, as it can reflect properly.

We recommend using a 25mm batten as a template, to ensure accurate and consistent air gaps throughout the floor area.

Taping and Sealing

Ensure all overlaps are fully taped and sealed using ThermaSeal Foil Tape, provided in the kit. This ensures EcoQuilt works as an insulating vapour control layer, avoiding air leakages and keeping the heat internal.

Ensure the brick walls are dust and debris free, and fully tape and seal around the perimeter with ThermaSeal Tape.

Install Second Layer

You then have the option to install a second layer of EcoQuilt, taut over the joists — an additional layer will maximise heat retention.

For further installation benefits, use a 25mm batten over the joists.

Installing Loft Boards

Once a layer of EcoQuilt is installed and taped using ThermaSeal Foil Tape, you're ready for the installation of loft boards. These can be screwed directly into the joists through the insulation.

Disclaimer – Ecohome-Insulation cannot be held responsible for any losses financially or physically from advice provided in this How-To-Guide.