Insulation in Bas-Rhin (67)
Insulation in Bas-Rhin (67) must be designed around the building itself, not simply around the thickness of an insulating material. Timber-framed houses, older buildings in Strasbourg, detached houses and post-war properties do not have the same walls or the same constraints. In traditional buildings, moisture management and compatibility with timber, cob or brick are crucial. A coherent assessment therefore covers lofts, walls, floors and openings, while also taking thermal bridges, ventilation and the behaviour of the home during hot periods into account.
Tip: have your energy performance certificate (DPE) and energy bills to hand for a more accurate estimate.
Why insulation matters in Bas-Rhin
Older walls in the département may consist of a timber frame combined with infill materials that allow water vapour to pass through. Covering them with a solution that is too impermeable can disrupt this balance and cause condensation within the wall. The choice of materials, any membranes and finishes must therefore respect the existing construction and ensure continuity of insulation around beams, floors and other junctions.
Architectural constraints also influence the method used. In some historic centres of Strasbourg or in wine-growing villages, external changes to façades may be restricted. Insulation is then focused more on lofts, floors and certain internal walls. The climate also makes summer comfort important: the building’s thermal inertia, solar shading and opportunities for night-time ventilation should be considered so that an improvement designed for winter does not become a source of overheating.
What insulation includes
Assessment of walls and choice of materials
Our national page dedicated to insulation presents the main areas concerned. For a local property, the assessment begins by identifying the nature of the walls, floors and roof. In older buildings, breathable materials may be required to preserve moisture transfer and avoid sealing a wall that needs to be able to dry.
Loft and roof insulation
Lofts are an area to examine as a priority, whether they are unused or converted. The project must take the roof structure, any ventilation spaces, service penetrations and continuity with wall insulation into account. In habitable lofts, comfort during hot weather also deserves particular attention because the roof is directly exposed to the sun.
Internal or external wall insulation
The choice depends on the façade, its construction and architectural constraints. External insulation can provide a continuous envelope where it is technically and legally possible. Internally, the junctions around floors, partitions, windows and beams become particularly important. On an older house, compatibility between the insulation, substrate and finish must be assessed before installation.
Ground floor insulation
A floor above a cellar, basement or unheated space can contribute to heat loss and a sensation of cold underfoot. The work varies depending on access and the nature of the structure. It must also take account of services, any moisture and perimeter junctions so that significant breaks in insulation are not left at the base of the walls.
Windows and thermal bridges
Replacing windows without examining their junction with the walls can leave cold areas around reveals, lintels or sills. In older buildings, the shape and appearance of windows may also be regulated. The aim is therefore to coordinate openings with wall insulation and ventilation, because more airtight windows alter airflow within the home.
Typical situations in Bas-Rhin
Timber-framed house with cob walls
Internal insulation must respect the hygrothermal behaviour of the wall. Timber, infill materials, renders and signs of moisture are examined before the solution is defined. Junctions around wall plates, beams and floors require particular attention to maintain continuity without preventing the materials from drying naturally.
Flat in a historic centre
Where the façade must retain its appearance, work may be shifted towards the interior, accessible lofts and certain floors. Window reveals and junctions with party walls or intermediate floors must be treated carefully to limit thermal bridges without unnecessarily reducing internal space.
Detached house with loft and basement
In a more recent house, several surfaces may be accessible without work inside the living areas. The loft, basement ceiling and external walls can be considered together. Choosing the order of the work helps create a more continuous envelope and anticipate the effect of insulation on heating and ventilation.
Grants and funding
Depending on the planned work and eligibility conditions, some insulation measures may qualify for MaPrimeRénov’, CEE (energy savings certificates), reduced VAT or the éco-PTZ (zero-interest eco-loan). The criteria depend in particular on the type of surface, the solution used and the chosen pathway. An RGE-certified professional may be required to qualify for certain grants.
Before committing to your project, you can contact GRAM Énergie to clarify the surfaces concerned and the building’s constraints. Official information on public schemes and eligibility conditions is also available from France Rénov’, particularly where insulation forms part of a wider renovation programme.
How we work
Assessment of the building
We identify the nature of the walls, floors, roof, windows and any signs of moisture.
Identification of areas to treat
Accessible surfaces and the main breaks in continuity are examined in order to prioritise possible work.
Choice of method
We match each surface with a solution compatible with its construction, exposure and architectural constraints.
Treatment of junctions
Particular attention is paid to windows, floors, beams, corners, wall bases and other points likely to interrupt the insulated envelope.
Coordination with equipment
The effects on ventilation, heating and summer comfort are incorporated before the work programme is finalised.
Our other services in Bas-Rhin
Improving the building envelope can be combined with a global energy renovation, installation of a heat pump, a thermodynamic water heater or an energy audit. You can also consult our page dedicated to energy renovation in Bas-Rhin, our content on Grand Est and our page dedicated to Strasbourg.
Frequently asked questions
Which insulation should be chosen for a timber-framed house?
The choice depends on the exact construction and condition of the wall. A wall combining timber, cob or brick generally needs to retain its ability to transfer and release moisture. The substrate, renders, finishes and any signs of water therefore need to be examined before the insulation system is defined.
Is external insulation always possible in Bas-Rhin?
No. It may be restricted by the building’s architecture, the appearance of the façades or rules applying in certain areas. Where external work is not suitable, other areas can be considered: internal insulation, lofts, floors or improvements to windows, with careful treatment of the junctions.
Can an older home be insulated without changing the ventilation?
This must be checked on a case-by-case basis. Insulation combined with more airtight windows can reduce the airflow that existed previously. Ventilation should therefore be checked so that moisture generated inside the home can be removed and the risk of condensation on remaining colder areas can be limited.
How can overheating after insulation be avoided?
Insulation should not be designed only for winter. In Bas-Rhin, the thermal inertia of the walls, window exposure, solar shading and opportunities for night-time ventilation must also be considered. In converted lofts in particular, the behaviour of the roof during hot periods is one of the design criteria.
Let’s talk about your project
Tell us about your home and your goals: we help you prioritise the works and identify the grants worth looking into.