ENERGY REHABILITATION WITH NEXT GENERATION FUNDS

We have carried out the energy rehabilitation of a single-family home between party walls in Sant Iscle de Vallalta.

What have we done?

We have improved the comfort conditions of the home.
Taking advantage of the existing rammed earth walls, with excellent thermal inertia, we have rehabilitated the roof and some windows while relocating the pellet boiler to improve its performance.

We have applied for Next Generation funds.
The action has implied a saving of 54.05 % in the consumption of non-renewable primary energy and 67.18% in the demand for heating and cooling of the home.
These important improvements have allowed us to obtain the maximum aid for housing: €11,600 for reductions of between 45-65 % in consumption.

How have we done the rehabilitation?

The existing roof, on a tile decking abobe the main beams, was composed of tiles directly on wooden rafters and battens, with a thermal transmittance of 5.31 W/m2 ºK.

The new constructive section is, from the inside out:
1. Vapor barrier
2. Thermal insulation: 16 cm of high-density water-repellent wood fiber plates
3. Waterproof and breathable sheet (Tyvek)
4. Wooden battens
5. Tiles recovered from the original roof with the introduction of ventilation tiles

In the same operation, a ventilated air chamber has been generated.

This solution has allowed us to lower the transmittance to 0.21 W/m2 ºK (much lower than the maximum 0.40 W/m2 ºK of the CTE-DB HE1)

The existing wooden windows and balconies had very little air tightness and single glazing. They have been replaced by wooden windows and balconies, but with improved sealing and better climate performance (chambered glass and low emissivity). The thermal transmittance has gone from 5 W/m2 ºK to 1.52 W/m2 ºK.

The pellet stove was used as a boiler but since it was located in an auxiliary building, it lost its stove function. Once inside the home, its performance has gone from 21.8 % to 78.2 %.