Interior insulation

Insulating walls

When it's not possible to insulate the walls of a building from the outside, internal insulation is the ideal alternative. It reduces heat loss from your building, resulting in substantial savings on your energy bill.

Various techniques can be used to insulate walls from the inside:

1. Insulation under wood or metal framing: This method involves fixing wood or metal studs to the wall, then covering the whole with roll insulation such as wood fiber, rock wool or glass wool. Plasterboard is then attached to this framework.

2. Plasterboard insulation : Plasterboard insulation boards, coated with a layer of polyurethane (PU or PIR) and wrapped in cardboard, are fixed directly to the wall surface. They provide additional insulation without the need for framing.

These interior insulation techniques offer an effective solution for improving your building's thermal performance. It is advisable to seek professional advice to determine which technique is best suited to your specific situation, and to ensure correct implementation.

Roof insulation

Insulating a roof from the inside allows you to insulate your roof without having to remove the tiles. An uninsulated roof represents up to 30% heat loss.

Insulating a roof from the inside offers a practical solution for improving your building's energy efficiency without having to remove the tiles. In fact, an uninsulated roof can result in up to 30% heat loss.

The traditional method involves installing rolls of insulation between the beams and rafters of the roof structure. These are held in place by a Metal Stud structure. An airtight membrane is then added before plasterboard or other finishes are applied. The most commonly used insulation materials are mineral wool (glass, rock) or plant-based (wood fiber, hemp, cellulose, etc.).

In the case of a perfectly straight frame, you can opt for plasterboard insulation boards with a cardboard coating and a bonded layer of polyurethane (PU or PIR) in various thicknesses. These products offer an excellent coefficient of thermal conductivity (lambda), which means they can achieve superior insulation with a reduced thickness, and therefore a higher thermal resistance index (R). However, they may have some limitations in terms of regulating overheating.

It's important to note that the choice of insulation materials and techniques will depend on your roof configuration, your specific energy efficiency needs and local regulations. XLG specializes in insulation work. Our expertise will ensure that your roof is optimally insulated.

Insulating lost attic space

Lost attics, often difficult to fit out due to insufficient height, represent the main points of heat loss in a building.

Insulating lost attic space improves thermal comfort all year round, reduces noise from outside and, above all, lowers a building's energy consumption.

If the attic is difficult to access, the most recommended method of insulation is to spray polyurethane (PU), cellulose, glass wool or rock wool.

On the other hand, if the attic is accessible, insulating the floor with panels or rolls can be a less costly solution.

Insulating the floor

Floor insulation offers an effective solution for considerably improving your thermal comfort and making significant energy savings.

There are several techniques for insulating the floor. Either underneath, by insulating the ceiling of the cellar or crawl space, or by insulating the floor of the crawl space, or over the floor.

Underfloor insulation is ideal for renovation projects, as it doesn't require demolition of the existing floor or adjustment of doors and baseboards. Insulation is provided by rigid panels, polyurethane foam or insulating rolls.

If access to your crawl space is complicated, one possible option is to partially insulate the floor by blowing in loose-fill insulation, although this technique is less effective than other methods because the first floor is not directly insulated.

If you don't have a basement, insulating the floor over it is necessary, but this involves demolishing the existing floor to install the insulation and new covering. If the floor is in good condition, you can install insulation and new flooring without demolition, but baseboards and doors will probably have to be raised.

Placement of high-performance chassis

Choose frames with a low U-value for better thermal insulation. The U-value measures the thermal conductivity of a material, and the lower the value, the better the insulation. Modern PVC or aluminum frames generally have low U coefficients, ensuring effective insulation. As for wooden frames, their performance depends on the type of wood used, the quality of manufacture, the age of the wood and the installation. High-quality wooden frames, properly installed and maintained, will provide excellent thermal insulation.

XLG specializes in renovation work and sash installation. We provide you with expert advice on your choice of materials, and carry out the work from A to Z.