How to Insulate a Wall

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In this video, you will discover how to insulate a wall using wool to increase your home's energy efficiency.

To learn more about the process of insulating your home, check out the other videos in our program, which will give you helpful advice for improving your home's energy efficiency.

Watch this short video for clear, simple instructions for insulating a wall for yourself in order to save energy and reduce you energy bills.

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In this video, you will learn how to insulate a wall using wool.

Warning, if you are using glass wool, then be sure to equip yourself with the following:

Protective gloves

A safety mask

Protective eyewear

Here, we will be using a natural insulating material

The tools you will need are:

A pencil

A tape measure

A ruler

A chalk line

A manual or electric saw

Cutting Pliers

A screw gun with screws suitable for plasterboard

A spirit level

A stepladder

You will also need:

Some wool insulation boards

Some rolls of vapour barrier

C stud and track

Flexible watertight sealing tape

And double-sided adhesive tape

Insulating a wall can be divided into 5 steps which we will set out for you in detail.

Step 1: Install the C studwork frame

To be able to install the insulation on your wall, you will first need to put up a metallic framework

This framework will hold your insulation in place.

The framework is a combination of studs and tracks.

Begin by marking out reference points for where you will lay the tracks.

Measure the thickness of two layers of insulation board.

Transfer the measurement onto the floor from the wall you are insulating.

First in the right-hand corner, then in the left.

Then, trace a straight line between the right and left-hand markers you’ve made with the aid of a chalk line

Trace the markers up to the ceiling using a spirit level.

Screw in a metal track along the marker line on the floor using a screw gun and screws adapted for plaster.

Drill at 60cm intervals.

If your floor is concrete, use a hammer drill along with the appropriate screws.

Repeat this step, fixing a track along the ceiling marker.

Step 2: Installing a metal studwork frame around the windows

If the wall you are working one has a window, you will need to set up a specific studwork structure around it.

The method we show you here is suitable for windows installed within the depth of the wall.

The method is different if the window is level with the interior wall.

Measure the height of the window. Cut two C studs to this length using the cutting pliers.

Mark a line measuring the width of one plasterboard, from the edge of the window.

Use a scrap of plasterboard to measure the spacing.

Drill the studs to the right and left of the window spacing your screws every 40cm

Measure the distance between the two vertical studs either side of the window.

Then cut two more studs to this length.

Drill them in at the bottom and top of the window.

Here, the shape of the window means a support cannot be installed above the window

Again, be sure to leave a margin the width of one plaster board between the window and the support.

STEP 3: Installing the C Studs

The C studs ensure that the insulation boards are held against the wall.

Start by installing the C Studs at the sides of the window.

Mark the spot where you will install the C Studs, in line with the C studs you've already installed along the sides of the window.

Use the spirit level to align the lines, first at floor level, then at ceiling level.

Line the C stud up facing the wall and mark the spot where you will cut it.

Cut the C stud to size and place it in the framework at the marked spot, hollow side facing outwards.

Do the same thing on the other side of the window. Then install the C stud at 60cm intervals from the C stud by the windows.

Drill the intermediary C stud in pairs, back to back.

Now all the C stud is installed.

To finish the framework for the window, measure the distance between the floor and the top of the horizontal C stud. Do the same for the top of the window and the ceiling.

Cut two pieces of C stud to each of these lengths and drill them to the stud surrounding the window.

Measure the distance between the two pieces of C stud and cut another piece to this length, then install it on the rails.

Install two more lengths of C stud back to back in line with the middle of the window, and drill them together.

Step 4: Cutting and installing the insulation

Put the first layer of insulation behind the framework.

Adjust it to the dimensions of your wall.

If you're using a natural insulation material, use an electric saw to cut the panels.

Your first layer is now installed.

The second layer is placed vertically between the C stud.

Install this layer across the whole surface of your wall.

Your wall is now completely insulated.

Step 5: Installing the vapour barrier

The vapour barrier is placed between the insulation and the plasterboard, and serves to regulate any water vapour exchanges, also preventing spots of concentrated humidity that could cause your insulation to deteriorate prematurely.

Measure the height of the wall and allow an extra 15cm on each side to ensure a proper join at the ends of the surface.

These extra centimetres mean you'll be better able to join the corners

Mark these measurements on the vapour barrier.

Cut the vapour barrier using a cutter.

Apply double-sided adhesive tape along the length.

Apply the adhesive bands on every other support.

Then, apply the vapour barrier, starting at the top to make it easier.

Make sure you leave a 15cm margin at the top of the wall when applying the vapour barrier.

Do the same thing along the length of the wall.

Join the different sheets using watertight sealing tape.

Take care not to leave any space where the vapour barrier sheets join.

Your insulation is finished.

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