How to Install Loft Insulation

loft insulation heat lossBetween 15 and 25 percent of the heat lost from homes across the UK is lost through the roof.

In order to combat this, the best solution is to fully insulate loft spaces in order to fill that massive void and help minimise any heat from escaping.

The reason for this is because loft insulation helps to trap rising hot air and keep the warm air in the home.

The total recommended thickness level of insulation in our lofts is a massive 270mm - you may find that your own home probably has roughly 100mm of loft insulation at the moment so you will more than likely require a top-up.

However, it will be well worth it in the long run as the average household saving on annual heating bills can be more than £150 - multiply this by a few years and you'll realise just how much you can save.carbon footprint


Protection Equipment

Mask Goggles Knee Pads Gloves

Make sure that your arms are covered as the fibres on the insulation can be quite irritating.

It is also a good idea to place a board across the joists to work from as just standing on the joists is quite risky - better safe than sorry!


Fitting Equipment

Insulation Knife or Scissors Tape Measure


Loft Insulation Laying Process

Step 1: Preparation

The very first thing you should do is clear your loft of anything that is stored in there and clean up any dust and debris lying around.

Once this is complete you should measure the gap between the joists to find out what width of insulation you require.

Once you know this, measure the length of the joists and count how many gaps you have between the joists.

Use these figures to calculate how many square metres or packs of insulation you will require to fully insulate your loft.

Once you know this it's time to purchase your insulation and make sure the packs will fit through the loft hatch - it's no use if you can't get it into the loft to install it!

Please make sure you have adequate lighting in your loft, you don't want to trip over any wires and fall through the ceiling after all.


Step 2: Laying the Insulation

Laying Loft InsulationBegin at the furthest end of the loft at the eaves and unroll the insulation between the joists towards the centre and gently press down. The reason for this is because it is easier to cut the insulation at the centre of the loft instead of trying to cut the correct length under the eaves.

Repeat this process from the opposite side of the loft - from the eave into the centre until you meet the first piece. Cut the second piece where it meets the first and press the two parts together.

Keep doing this for all the spaces between the joists and you will be finished in no time.

Remember to leave a 25mm gap at both ends to make sure the insulation doesn't block the ventilation from the eaves.

This is to try and prevent condensation from building up and causing a damp problem. If you can see daylight near the eaves then ventilation is probably not an issue.

Never lay insulation over electrical wires - always feed the insulation under the wires making sure the wires run along the joists or that they are on top of the insulation. If this isn't possible then just leave a gap where the wires are.

Do not insulate under any water tanks - warm air from below will keep the chill off the base of the cistern to help prevent the water from freezing.


Step 3: Insulate the Loft Hatch

Fit an off-cut piece of insulation to the loft hatch itself by simply cutting a piece off and attaching it to the hatch using PVA glue.



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