Readers ask: How Does Loft Insulation Work?

Loft insulation works by reducing the amount of heat lost from your roof – reducing the amount of fuel you need to burn for heating and saving you money. When your home is heated, a lot of that heat escapes through your roof, both through conduction and convection.

How does loft insulation prevent heat loss?

Insulating materials are bad conductors and so this reduces the heat loss by conduction. The material also prevents air circulating inside the cavity, therefore reducing heat loss by convection. Heat loss through the roof can be reduced by laying loft insulation.

Does insulating a loft work?

Insulating your loft, attic or flat roof is an effective way to reduce heat loss and reduce your heating bills. Installed correctly, loft insulation should pay for itself many times over in its 40-year lifetime.

Will loft insulation make a difference?

The most obvious difference offered by an insulated loft is the saving in energy bills, and it’s very simple here. It’s estimated that a quarter of all the escaping heat from a building goes through the roof. That means you could recover the modest cost of the insulation in as little as two years.

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How does loft insulation trap heat?

Heat escapes through your roof via both conduction and convection methods. The layer of insulation traps heat inside the rooms below the loft, so the air within your property stays warmer for longer. It also keeps cold air from outside entering your property.

Why is loft insulation so effective?

Loft insulation works by reducing the amount of heat lost from your roof – reducing the amount of fuel you need to burn for heating and saving you money. The thicker your loft insulation is, the more effective it will be at stopping the heat from leaving your house – an insulation depth of 270mm is recommended.

How do you stop heat escaping from roof?

The simplest way to prevent heat loss through your roof is to put insulation in the loft. Insulation reduces the amount of heat that is able to pass through the ceilings of your home, keeping it trapped within the living space and stopping it from being wasted in the loft.

Can you put too much insulation in loft?

As long as you ventilate your property properly, you can have as much insulation as you like within reason. The trick with loft insulation is to balance the amount of insulation you have with the amount of ventilation necessary to prevent damp. As long as you get that balance right, you should be fine.

Should loft insulation go to the edges?

Insulation should be continued right to the edge of the ceilings but it shouldn’t block the eaves’ ventilation. You must also avoid laying insulation over recessed light fittings or cables in the loft space that may overheat.

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Should you remove old loft insulation?

In most circumstances removing your old insulation isn’t necessary and it can actually be quite beneficial to leave it. This is as most insulation will retain its thermal properties so leaving it in place will mean that you continue to benefit from it whilst also having an additional layer of insulation on top!

Does loft insulation cause damp?

Loft insulation itself will not ’cause’ damp issues as such – as in it will not act as the main catalyst for it. However, if a poor insulation material is chosen, and an ineffective method undertaken, then this certainly won’t help matters.

Can I insulate the underside of my roof?

Open-cell spray polyurethane foam or closed-cell spray polyurethane foam (ccSPF) insulation can be sprayed along the underside of the roof sheathing to provide a conditioned and insulated attic space that can be durable and efficient in all climate zones (see Figure 1).

What do you cut loft insulation with?

To cut the insulation, use a long sharp knife with a serrated edge, such as a bread knife. Sandwich the insulation between two boards and, using the top board as a guide, run the knife along the edge for a straight cut. Use a pair of large scissors for small or difficult cuts, for example around pipes.

What percentage of heat is lost through windows?

A typical house loses 10% of its heat through the windows. The successful specification of energy efficient windows requires a sound understanding of the dynamics of thermal performance.

How does loft insulation reduce convection?

The insulating material contains pockets of trapped air and therefore reduces conduction and convection. The fibres of the insulation prevent the trapped air from circulating and causing a convection current to be set up.

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Do thicker walls make a house cool down quicker?

A building with walls of a high thermal conductivity will cool down faster than one with walls of a low thermal conductivity.

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