Planning a renovation for a multifamily building is a major undertaking. Although owners may initiate a project for different reasons, they should view it as an opportunity to address any shortcomings that exist with the current structure. Rising energy costs, poor indoor air quality, and noise pollution all affect the indoor climate, especially in older buildings.

A variety of strategies can help increase the energy-efficiency, reduce the heating costs, and improve the indoor environment.

These usually include:

  • A loft or basement renovation.
  • Renovating the exterior.
  • Remodelling the individual units inside the building.

Before starting a project, consider the following elements for a multi-unit home renovation.

Relevant applications

Why renovate the loft?

Warm air rises, and about 25 percent of heat losses occur via the roof of a building. Renovating an empty loft space or roof with insulation that provides superior thermal performance can limit these losses, reducing the cost of heating and cooling the building.

A renovation project that addresses the issues with energy-efficiency by insulating loft spaces or the roof helps improve the indoor comfort of the occupants by keeping the building warm during winter and retaining cool air in the summer.

ROCKWOOL’s loft insulation products also provide:

  • Improved thermal performance using the insulating properties of stone wool.
  • Resistsmould and corresion by repelling water and moisture whilst still allowing vapours to travel through and escape.
  • Increases fire resilience as it is a non-combustible insulating material and can resist temperatures of up to 1000°

ROCKWOOL stone wool insulation products are available for every type of roof and installation method.

Why renovate the exterior?

Apart from the loft or roof, a building’s exterior is also a major source of heat loss. Renewing the exterior with stone wool can improve the indoor climate, reduce noise pollution and provide additional savings from lower energy costs. By insulating the façade using stone wool façade insulation or and ETICS system, occupants can stay comfortable indoors regardless of the outside climate.

An exterior renovation using stone wool insulation for a multi-unit home will:

  • Limit heat losses and reduce the effects of thermal bridging in the exterior.
  • Provide greater thermal performance inside the entire building, keeping residents comfortable at all times.
  • Reduce the amount of outside noise stemming from external sources such as busy streets or traffic
  • Increase the building’s fire resilience by slowing the spread of fire

ROCKWOOL has a variety of exterior insulation solutions suitable for cavity walls, rendered systems, or façade cladding. Renovating existing buildings with an External Thermal Insulation Composite System (ETICS) provides complete system with optimal performance, and is easy to install as residents can continue living in their homes.

Why renovate individual apartments?

Additional interventions for the individual apartments inside the building enables owners to optimise the indoor climate even further. Applying stone wool insulation within the internal walls provides greater control of the indoor climate for each individual unit. Allowing occupants to manage their own comfort levels without running up their heating or cooling costs will maximise their energy savings. In addition, it will greatly reduce the sound travelling between units, meaning fewer complaint from tenants.

Renovating individual apartments with stone wool insulation can:

  • Improve the fire safety throughout the structure, protecting residents by preventing a fire from spreading from unit to unit.
  • Increase acoustic performance and limit noise disturbances from neighbouring units.
  • Reduce individual heating and cooling costs while they maintain a comfortable temperature inside their units during different seasons.

Why renovate the basement or garage?

No apartment block renovation is complete without also addressing the bottom level of the building. Concrete does not provide adequate insulation, sucking up heat from the rest of the structure. By insulating with stone wool in the basement of the building, it is possible to increase the entire structure’s thermal performance.

With a comfortable temperature, the lowest level of the building can serve as an additional functional space, like a laundry, or even add more living space. Owners can turn it into a communal area that could provide rentable income if it is not being used as a car park.

ROCKWOOL’s stone wool insulation for basement renovations includes:

  • Basement floor and wall insulation – Helps to prevent heat transfer between colder, belowground environments and the structure
  • Basement ceiling insulation – Keeps warmer air from leaking to the lower levels and helps keep colder air inside the basement area. It also helps contain any moisture build up in to the basement, keeping the structure safe from the effects.

Stone wool creates a sufficient barrier between the two environments and is suitable even if the structure’s bottom level serves as a car park. It will protect residents against the effects of noise, moisture, and cold air.

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