House Insulation

Loft insulation, wall insulation, floor insulation, roof insulation, crawl space insulation, ceiling insulation!?  Insulation, insulation, insulation!!  We all know a house needs insulation, but getting your head around all the different areas and types can be a little confusing!

Acquiring good quality insulation and installing energy efficiency measures in key areas around a house can make the difference from a home being one that leaks heat and is always cold, to a comfy, inexpensive to run and easy to heat home.  In short, insulating a home correctly can save you money and be good for the environment.

With many types of insulation and these being for various different areas around a house, the task of insulating a home correctly and cost effectively can seem like a minefield to navigate!  Luckily, here at Government Boiler Grants, we have compiled this handy and easy to understand guide to help you navigate the pitfalls and gain an understanding of the various types of insulation, benefits of insulating and the costs involved.

Benefits of Property Insulation:

1. Minimise heat loss by creating a thermal barrier

2. According to research by, loft insulation can save an average family home around £315 per year!  The average life span of wool insulation is 40 years, so it pays for itself relatively quickly.

3. Having a more energy efficient home will result in a reduction of carbon dioxide production (average house between 550kg and 1030kg per year) and will result in a smaller carbon footprint.  Research conducted by PINAS confirms that reducing energy usage will help work towards achieving the Paris agreement 2050 in slowing down climate change.

4. A well insulated roof will act as a sound barrier and will definitely result in less sound travelling down in to the rooms below.

5. A well insulated house will have a higher energy performance certificate (EPC) rating and will add to the value and saleability of a house.

Loft Insulation works like a hat made from wool, but for your house!  Whether you are in to DIY, or you seek a professional, it’s a fairly straight forward concept of having woollen insulation trap any rising heat and prevent it from escaping out of the rooms below.  Keeping the warm air in results in less energy required to keep the house stay warm.

Roof Insulation: Commonly this is done when a loft has been converted in to a liveable  space and the extra heat generated from radiators and heat sources below, needs to be trapped in and prevented from escaping through the roof above.  Insulation needs to be placed in between the rafters and boarded in, to hold them in place.  This can then be plastered over for a pleasant decorative finish.

Ceiling Insulation is another effective measure of trapping rising heat and containing it in the area below.  Installing this is similar in method to installing roof insulation, with the exception of having to create a suspended area in which to place the insulation in and then boarding up and plastering over for a decorative finish.

Cavity Wall Insulation: A cavity wall usually consists of a double skin brick construction, or one skin brick and one skin concrete.  This gap in between the skins (walls) allows for air to run through it, making it a prominent area of heat loss.  To insulate this, a common method of injecting a suitable insulating foam material in the area between the two skins is used.  A good way of checking if your home has cavity wall insulation is to visually check for periodic drill holes in the outside wall, that have been filled in with mortar after injection of an insulating foam.

Typical Heat Loss (%) Areas in a House

Solid Wall/Internal Wall Insulation:  As a solid wall is also an area of where heat loss can occur, it can be mitigated by internal wall insulation.  As unlike a cavity wall, there is only a single skin and that is usually made of brick.  The wall will need to have insulation boards attached to it from the inside, or a layer of insulation from the outside, in order to contain any heat that would usually escape from it.  Internally this will result in less floor space, especially if a stud wall needs to be installed, due to the brick wall not being in a suitable condition to attach insulation directly to it.  A stud wall will then be filled with insulation and boarded in.  Furthermore, it will need to be plastered over for a decorative finish and this method will result in even less floor space as a result, in order to accommodate the thickness of the stud wall and plaster.

Suspended Floor Insulation:

Solid Floor Insulation

Crawl Space Insulation:

Heating Measures

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