Insulation renovation work in Marche-en-Famenne

Insulate the walls: address the largest area of heat loss

After the roof, vertical surfaces are the second source of heat loss. Wall insulation work eliminates the feeling of cold walls and significantly improves the thermal inertia of the building.

External insulation (ITE)

This is the most effective solution. It involves wrapping the house in an insulating coat, finished with plaster or cladding. This technique eliminates all thermal bridges and protects the limestone masonry from freeze-thaw cycles, which are particularly aggressive in the province of Luxembourg. ITE (external thermal insulation) aims for thermal resistance R ≥ 4 m²K/W for renovated walls, in accordance with the Walloon energy performance objectives. This is the choice made for the majority of heavy renovation projects in our intervention area.

Internal insulation

Ideal for preserving the charm of a stone facade in Waha, or when external insulation is not technically feasible. We install frame partitions with integrated insulation — rock wool, wood fiber, or PIR — finished with ready-to-paint plasterboard. We meticulously manage residual moisture to keep the walls healthy. A well-insulated wall also provides a measurable gain in acoustic insulation against external noise.

The frames: the essential complement to the envelope

High-performance windows: the final link in insulation

Thermal insulation would not be complete without addressing the openings. Windows are the thinnest areas of the facade. Replacing old glazing with high-performance window insulation is the final link in the chain. In renovation, the target Uw value is a maximum of 1.0 W/m²K for high-performance double glazing, and 0.8 W/m²K or less for triple glazing — thresholds that condition access to Rénopack grants.

Sealed installation and thermal and acoustic comfort

We install next-generation frames in PVC, aluminum, or wood, equipped with high-efficiency double or triple glazing with argon gas. The quality of the installation ensures perfect air tightness thanks to specific i3-type membranes, limiting infiltrations and condensation risks. The Velux insulation is also carefully addressed to avoid thermal bridges under the roof and improve the comfort of the attic. Similarly, the front door insulation enhances the thermal and acoustic performance of the home. Each connection is made with precision to ensure durability, interior comfort, and daily energy savings.

Financial Aid and Profitability: the Housing Audit

Rénopack Grants and Housing Audit: Reducing the Cost of Work

Insulation work in Marche-en-Famenne represents a budget, but the Walloon Region actively supports homeowners. Through a Housing Audit, you gain access to substantial grants — notably the Rénopack grants — which significantly reduce the payback period. These aids are calculated based on the performance achieved and the household income.

Reduced VAT at 6% and Immediate Savings on the Bill

The reduced VAT at 6% — conditioned by the age of the building (over ten years) — applies here without exception to the entire insulation bill. This is a direct and immediate saving that adds to the Walloon grants. Our specialists guide you through these processes and help you identify the best combinations to maximize the subsidies obtained.

Your Insulation Partner from Rochefort to Ciney

Our team from Marche operates throughout the greater Marche area — Waha, Marloie, Aye, Hargimont, On — as well as in neighboring municipalities: Rochefort, Ciney, Hotton, Nassogne, and Durbuy. We know the specifics of local construction, from limestone rubble houses to renovated old farms in the province of Luxembourg.

Common Issues and Our Solutions

Thermal Bridge on Window Return after External Insulation

External insulation is the most effective technique for eliminating thermal bridges on façades — but it can create a new one if the window return is not treated with the same rigor. That’s why glazed bay insulation plays a crucial role in the overall thermal performance of the building. When the window return remains bare after the insulation is installed, moisture can condense there in winter, causing stains and mold near the new frames. At Avenir Rénovations, glazed bay insulation is systematically included in our ITE services: window returns are treated with suitable thin insulation and a careful plaster finish, with no hidden extra costs.

Poorly Sealed Vapor Barrier Around Chimney Flues

In homes in Marche-en-Famenne still equipped with a wood stove or an open fireplace, the flue pipes pass through the insulation layer and create a critical weak point in the continuity of the vapor barrier. A rough seal with foam allows water vapor to pass into the insulation, which gradually saturates and loses its thermal properties. We carry out these connections with specific approved sleeves and sealing tapes for heat zones, ensuring durable continuity even with the thermal expansions of the flue.

Floor Insulation That Compresses and Loses Its Thermal Properties

Installing soft insulation — mineral wool or open-cell foam — under a screed or floor covering without respecting the required compressive strength is a common mistake in poorly prepared sites. Under the weight of the covering and usage loads, the insulation compresses, its R-value decreases, and the floor's efficiency heats the ground rather than the room. We exclusively select floor insulations with compressive strength suitable for the application — high-density PIR or extruded polystyrene — to ensure performance remains stable throughout the floor's lifespan.

Frequently Asked Questions

Which area of the house should be prioritized for insulation in Marche-en-Famenne?

Insulating the attic is always the number one priority. In an uninsulated house, nearly 30% of heat escapes through the roof. The return on investment is the fastest of all interventions, and the effects are felt from the first winter. Next come the walls, the frames, and finally the floors.

For a typical limestone house in the region, is it better to insulate from the inside or the outside?

External insulation (ITE) is technically the most efficient: it eliminates all thermal bridges and protects the masonry from freeze-thaw cycles. However, when the stone facade has architectural character to preserve — like in Waha — internal insulation is the chosen solution. The choice depends on technical constraints and the owner's wishes, and is decided during the diagnosis.

Are Walloon grants for insulation cumulative?

Yes, through a Housing Audit conducted by an approved auditor, it is possible to combine several types of insulation work in the same file thanks to Rénopack grants. These aids can cover a significant portion of the cost of the work, depending on the performance achieved and the household income. This reduced rate of 6% applies in parallel for any dwelling over ten years old.

Which insulating materials are best suited for old houses in the province of Luxembourg?

For the limestone houses common in the Marche-en-Famenne region, hemp and wood wool are particularly suitable: these ecological insulators naturally regulate humidity and allow the walls to breathe. Cork is suitable for damp areas like basements. Rock wool remains a safe choice for attics due to its acoustic and thermal performance.

Do you have an insulation project in Marche-en-Famenne?

Insulating your limestone house or slate-roofed home is adapting it to what it deserves: comfort, sustainable savings, preserved heritage value. Contact us for a technical analysis of your building and a detailed quote — our craftsmen from Marche will come to assess your situation and propose a targeted insulation strategy, material by material, area by area.