Wall-Insulation-Construction

Wall-Insulation-Construction

Insulating the walls of your home

The principle of insulating the walls of a house

The Principle

The walls of the house are the only barriers between the inside of the house and the outside air.

The greater the surface area of these walls, the greater the heat loss.

Just like the roof and the floor, it is important to insulate the walls as well.

The heat loss in a house is

most often due to poor insulation.

Each part of the house facing the outside

presents a risk of heat loss.

The consequence is ruthless:

an over-consumption of energy to heat the home.

It is therefore very important to insulate your house properly.

Insulating the walls allows for significant energy savings.

The walls of a house are an important place of heat loss. Their insulation is therefore one of the first things to do when you are looking to save energy.

Simple to implement, the very low cost of the work allows a saving of nearly 15% of the energy consumed to heat your home.

SIMPLICITY OF THE WORK

Wall insulation does not require major work in your home.

It is done from the inside when the exterior facade is in good condition. Or from the outside when the exterior needs to be renovated.

AN IMMEDIATE ENERGY SAVING

As soon as the walls are insulated, the energy consumption for heating is significantly reduced.

The return on investment is not long in coming.Wall-Insulation-Construction

 Wall insulation: how does it work?

How does it work?

Insulation of the walls from the inside

The big advantage is that you don’t touch the exterior aspect of the house and therefore the insulation does not require any declaration of work to be done with the City Hall.

Two possible techniques:

Either the insulation is inserted between the wall and a counter-partition such as plaster brick or plasterboard.

This technique can be used to correct an irregular wall.

Either composite or complex lining panels are used, consisting of an insulating part (mineral wool, expanded polystyrene, polyurethane, etc.) and a plaster facing, commonly called Placoplatre.  This technique also allows for acoustic reinforcement to insulate the rooms from noise.

The only disadvantage of interior insulation is the reduction of the interior surface due to the thickness of the panels.

Insulation of the walls from the outside

Insulating the walls from the outside is the best solution when the external facade plaster is damaged or obsolete.

When renovating a facade, it makes sense to add insulation.

Exterior insulation treats most thermal bridges and does not alter the interior surface of the house. However, it requires a declaration of work to the City Hall before any work.

The insulation is done by gluing the insulation panels (usually expanded polystyrene) and then by applying a specific coating and finally a finishing coat or a sprayed hydraulic coating (mortar).

It is also possible to cover the insulation panels with facings such as stone or ceramic tiles…

There are also commercially available what are called garments. Factory prefabricated elements consisting of insulation and a facing plate (such as steel or aluminum sheet, PVC, etc.).

There is also the solution of insulating coatings: which are none other than mortar mixed with particles of insulating material (expanded polystyrene bead). This technique requires the installation of three layers of rendering without ever achieving the thermal performance of the techniques previously mentioned.

The insulation of the walls in their thickness :

This solution, which is only possible in new construction, consists of using new materials in the construction of the walls that have an insulating capacity. These are terracotta monomers and cellular concrete blocks.

The main advantages of these materials are the time saving for the installation, the simplicity of implementation, the reduction of thermal bridges and the improvement of thermal comfort.

The insulating materials used have a high thermal resistance.

This is how they retain the heat of the house, not allowing any heat flow (either from cold outside air or from the heat inside the house) to pass through them.Wall-Insulation-Construction

The insulation of the walls of your house: the implementation

Mise and oeuvre

Depending on the state of disrepair of the facade of your house, the walls will be insulated from the inside or the outside.

INSULATION OF THE WALLS FROM THE INSIDE :

The insulating panels are glued or fixed by screwing directly on the interior walls of the house. The joints between each panel is a delicate operation because it will directly act on the final visual aspect of the interior walls.

This operation is very fast and is carried out by a fully equipped professional.

INSULATION OF THE WALLS FROM THE OUTSIDE :

The insulation is carried out by gluing the insulation in panels (generally expanded polystyrene) then by the installation of a specific coating and to finish with a finishing coat or a sprayed hydraulic coating (mortar).

It is also possible to cover the insulation panels with facings such as stone or ceramic tiles…

The insulation of the walls in their thickness :

During the construction of your home, you should opt for terracotta monolithic walls or cellular concrete blocks for your exterior walls.

The finishing of the walls is done by laying a traditional plaster on the outside and the installation of plaster or rendering for the interior walls.

AN INSTALLATION CARRIED OUT BY A PROFESSIONAL

The quality of the installation of an insulator is very important since the finishes are decisive for the efficiency of the insulation.

It is important to check that there are no gaps between the insulations or between the insulation and the rafter. This would generate an air leakage that would divide the thermal resistance by 5. The superior quality of the insulation cannot compensate for this loss.

This is why, even if the installation of wall insulation could be done by a private individual, the technical expertise of a professional will guarantee the thermal efficiency of the insulation work.

Technical characteristics of wall insulation

Technical characteristics

There are three technical characteristics that should be kept in mind when choosing insulation materials:

Thermal conductivity (W/m.°C)

Insulation materials must have very low thermal conductivity.

The lower the thermal conductivity of a material, the lower its ability to carry heat.

This makes your home better insulated.

Thermal resistance (m².°C/W)

Thermal resistance is the result of the performance of the insulation of the house.

It is a function of the choice of the insulating material used and the thickness of the insulation.

How much does it cost to insulate the walls of a house?

What is the cost?

INSULATING THE WALLS OF YOUR HOME PREVENTS HEAT LOSS.

AND THUS REDUCE THE HEATING NEEDS OF THE HOUSE.

Roofing losses can result in a 15% waste of heating energy. Its financial impact on a household’s energy budget is therefore just as important as the choice of heating method itself.

A SMALL INVESTMENT COMPARED TO THE ENERGY SAVINGS ACHIEVED

The amount of work will depend on the choice of materials and the technique chosen (interior or exterior exposure):

Count about :

18 euros/m² for expanded polystyrene,

18 euros/m² for mineral wool (glass wool or rock wool),

35 euros/m² for extruded polystyrene,

65 euros/m² for polyurethane.

Be careful, mineral wools (rock wool) can be quite irritating. It is therefore not recommended to use it if you plan to pierce the walls to integrate light spots for example.

The cost of an insulation from the outside is more expensive (excluding the cost of facade restoration) than an insulation from the inside.

A REDUCED INVESTMENT THANKS TO THE TAX CREDIT.

The French state wishes to help control and reduce energy consumption.

15% tax credit for materials laid by a professional

What amount of expenses does the tax credit apply to?

The tax credit covers the price of equipment and materials, excluding labour, meeting the characteristics.

What is the amount of expenses eligible for the tax credit?

For the same taxpayer and the same dwelling, the amount of expenses eligible for the tax credit may not exceed, for a period of five consecutive years between January 1, 2010 and December 31, 2015, the sum of 150 € / m² of opaque walls insulated from the outside and 100 € / m² of opaque walls insulated from the inside (Article 18bis of the General Tax Code, Annex 4).

To know your rights to the tax credit, you are advised to refer to the provisions of Article 200 quater of the General Tax Code.

For the application of this measure, it is strongly recommended to refer to :

The website www.impots.gouv.fr (page on the tax credit)

Article 200 quater of the General Tax Code, Article 90 of the 2005 Finance Act, Article 83 of the 2006 Finance Act, Article 109 of the 2009 Finance Act and Article 80 of the 2010 Finance Act.

The tax instructions 5B-26-05, 5B-17-06 and 5B-17-07

The decrees of February 9, 2005, December 12, 2005 and November 13, 2007 issued for the application of articles 200 quater and 200 quater A of the general tax code relating to capital expenditure on the main dwelling and amending annex IV to this code

Sections 81 to 83 of the 2012 Finance Act

REGIONAL, DEPARTMENTAL, and ANAH AID.

Some regions, town halls or the ANAH also subsidize the installation of photovoltaic panels by granting financial aid. Find out more directly from these administrations or from your ESPACE INFO ENERGIE.

A VAT REDUCED TO 7% FOR HOMES OLDER THAN TWO YEARS.

Tax credit – eco-construction A QUICKLY AMORTIZED INVESTMENT THANKS TO

ENERGY SAVINGS MADE :

You reduce your energy consumption for heating your home. This can represent several hundred euros per year.

Wall insulation: environmental impact

Environmental impact

THE HUNT FOR WASTE

By insulating your walls, you limit heat loss from your home.

Your heating needs will be reduced as a result.

A good insulation is the guarantee of the control of its energy consumption.

The energy saved in this way is as much energy to produce and as much greenhouse gas avoided.

The environmental impact is then immediate and lasting for many years.

BACK TO NATURE

Many manufacturers now offer completely ecological insulation materials made from natural products such as sheep wool, wood, etc…

Renewable materials with very low environmental impact, a way to become a little more Eco-Citizen.