FAQ – Loft Insulation

Question 1

How does loft insulation work?

Accepted Answer

Loft insulation works by creating a thermal barrier that reduces the transfer of heat between the inside of a building and the outside environment. It’s usually installed in the loft or attic space, directly beneath the roof. The primary goal of loft insulation is to improve energy efficiency by minimising heat loss in the winter and heat gain in the summer.

Question 2

What are the benefits of loft insulation?

Accepted Answer

Insulating your loft is a fantastic way to reduce heat loss in your property. The insulation acts as a barrier, helping to retain the warmth generated within your home and reducing your energy bills. It helps to maintain a more consistent and comfortable indoor temperature, reducing the need for heating in the winter and cooling in the summer. An energy-efficient home with proper insulation is often more attractive to potential buyers and therefore may contribute to an increase in the value of your property.

Question 3

How much energy can loft insulation save in a Worthing home?

Accepted Answer

Installing loft insulation in Worthing properties can reduce heat loss by up to 25%. For period homes, using heritage-approved insulation makes it possible to enjoy lower energy bills without compromising the original character of the house.

Question 4

How much heat is lost through draughts?

Accepted Answer

Draughts (or air infiltration) are often one of the biggest sources of heat loss in a building. In a typical ‘unimproved’ period building (one that has not had modern insulation measures applied) we estimate the draughts cause approximately 30% of total heat loss. To accurately measure the sources and rate of draughtiness (or air infiltration) an air pressure test is required.

However, most occupants know where the draughts come from and where they are worst because they can feel it! Windows, doors and chimneys will normally be responsible for the majority of the draughts. Mitchell & Dickinson’s surveyors will help you identify the draught sources and their contribution to your building's thermal performance.

Question 5

Can loft insulation reduce damp in my property?

Accepted Answer

Yes, damp is caused when insufficient insulation leads to temperature differences between the indoor air and the loft space. When warm, moist air from inside the house comes into contact with the cold surfaces in the loft (such as the roof or walls), it may lead to condensation. This can contribute to dampness and create an environment conducive to mould growth.

Good quality loft insulation and adequate ventilation is crucial for maintaining a balanced moisture level in the loft space. Without proper ventilation, dampness may become a problem.

Question 6

What different types of loft insulation are available?

Accepted Answer

There are several different types of loft insulation available, including fiberglass insulation, mineral wool insulation, cellulose insulation and reflective foil insulation. One of the most eco-friendly types of loft insulation is made from natural sheep’s wool.

Question 7

What are the benefits of sheep’s wool loft insulation?

Accepted Answer

This natural and eco-friendly material has many beneficial properties including a 60-year life compared to 15 years for glass wool, and an increase in insulation properties in damp conditions.

Products such as Mitchell & Dickinson’s eco-friendly sheep’s wool loft insulation are treated with natural borax to prevent damage from pests, are not irritating to skin or respiratory systems, support British sheep farmers – improving economic resilience – and use little energy in manufacture. Sheep’s wool insulation is also biodegradable, reducing its environmental impact at the end of its lifecycle.

Question 8

Do I need a professional to help me install loft or ceiling insulation?

Accepted Answer

While it is possible to install loft insulation yourself, it’s often worth hiring a professional to ensure it’s installed correctly and effectively. They will be up to date on the latest building regulations and will have the correct specialised equipment to complete the job. They’ll also have knowledge of achieving the desired thermal resistance and understand the required density and thickness of the insulating material.

Question 9

Is it also possible to insulate sloping ceilings?

Accepted Answer

Yes, and we recommend that you do because sloping ceilings have very high heat loss per square metre. This is because they usually consist of a sheet of plasterboard, a 100mm ventilated gap between the rafters, then battens, felt and tiles. If you compare this to an 18-inch wall or 12 inches of loft insulation, it becomes clear how little insulating effect they have, making them responsible for the coldness you’ll often find in these rooms.

Mitchell & Dickinson’s sloping ceiling insulation consists of thermal laminate boarding, a high-efficiency insulation board with plasterboard attached which is applied to the underneath of the sloping ceilings by screwing through to the rafters. Gaps around the edges are then filled and the whole area re-plastered.

Question 10

What type of loft insulation is best for period properties in Sussex?

Accepted Answer

Breathable natural materials, such as sheep’s wool, are ideal for insulating Georgian, Victorian, and listed homes in Sussex. They reduce heat loss while allowing the building to breathe, protecting timber and plaster from moisture damage.

Question 11

Can loft insulation be installed in listed buildings in Sussex?

Accepted Answer

Yes, but it must be done carefully. For listed buildings in Sussex, conservation officers usually recommend breathable loft insulation that respects historic fabric. Professional advice ensures your project meets heritage guidelines.

Question 12

How long does loft insulation take to install in Worthing homes?

Accepted Answer

For most properties in Worthing, loft insulation can be installed in a single day. Larger or listed homes may take longer, as careful handling of historic features is required to ensure the insulation is both effective and conservation-friendly.

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