These days there is a lot of talk about external doors and windows, of which sills (or docks) and counter-sills are a fundamental part, as their replacement is part of the works covered by the Superbonus 110%.
But let’s take a step back first to understand what we’re talking about.
Window sills and window sills
The external sills are manufactured in contact with the lower end of the windows which protect the underlying part of the wall from the elements. Generally they are slightly inclined towards the outside and equipped with a drip (the use of which even seems to date back to 1300 AD).
The internal sills or counter-sills are instead the part of the sill facing inwards with mainly a furnishing function and a support base.
Sills and counter-sills must be chosen according to the style of the house: if the style is modern, essential artifacts must be preferred, while in period or historic buildings they must reflect the style of the building.
In the case of buildings subject to the constraints of the “Fine Arts” the choice must fall between the types of materials used at the time.
Window sills and counter-sills however are not only functional and necessary elements but are real furnishing accessories: these can be integrated with the rest of the house almost to “disappear” from view, or, on the contrary, they can be highlighted.
In practical terms, what are the fundamental characteristics that windowsills and counter-sills must possess?
They must certainly be insulating and resistant to atmospheric agents and UV rays, furthermore stable, compact, but above all they must be easy to maintain and clean.
All the characteristics mentioned above are perfectly satisfied by marble and natural stones which possess unique properties which make them the most forward-looking and lasting choice over the centuries.
110% bonus for renovations
Let’s now go back to the starting point, i.e. the 110% bonus for renovations: with a Circular in July 2020, the Revenue Agency swept away all the doubts that had arisen in this regard and established that, within the spending limits , the Bonus may also include “the costs strictly connected to the completion of the driving or driven interventions”.
This means that, for example, if the installation of the thermal coat requires the replacement of window sills, these costs can be included in the invoice and be recovered with the 110% Bonus.
The materials that we think we recommend are the following:
These are materials which, based on our many years of experience, have shown the best performance in terms of resistance, inalterability and compatibility with any thermal insulation intervention.
We remain at your complete disposal to show you all the different alternatives in terms of products and finishes, visible in our factory, and to help you find the most congenial solution for your home.