Replacing the fixtures what to consider
The works of renovation of a house, involve a series of interventions aimed at a improve the conditions of comfort and safety.
Among the most recurrent interventions, the replacement of old fixtures with new types that are more performing from an energy point of view, is now a consolidated practice.
The replacement of internal frames generally does not involve particular problems, as it involves removing the old frame from the existing frame, leaving the subframe on which to place the new frame, if the latter has the same geometric characteristics as the previous one.
In case of mild geometric differences in the space, resulting from works such as overlapping floors, a first problem may arise when the size of the existing subframe is not suitable for housing the new frame.
Pay attention to the overall dimensions
If the width of the subframe is in line with the width of the new frame and not with the height, it is still possible to insert the frame.
Generally enough disassemble the upper crosspiece of the counterframe and make the appropriate modifications, removing part of the masonry, inserting a new crosspiece anchored in the upper part.
When the differences in the width of the compartment are considerable, it is advisable to remove the old subframe and replace it with a new one of suitable size.
While inside the substitutions of fixtures are simpler, the replacement of the external ones is not as simple as the one described above, for a series of reasons which I will illustrate below.
Replacement of external frames: the operational phases
To remove an external frame you start with lo remove the doors from the hinges that anchor it to the frame. Usually this phase does not involve particular difficulties.
The next one disassembly of the frame in most cases it requires a preliminary intervention on the walls of the compartment, in order to create a separation between the plaster and the structural part of the frame.
The importance of this operation is more delicate, especially when the fixtures come replaced in inhabited areas, where no further work is intended.
In any case, it is good to know how removing the frame entails inevitably the breakage of parts of plaster, in addition to the need to remove the parts of the skirting boards on the side of the compartment.
This last operation often creates problems when there is no suitable skirting board to replace the removed ones.
Removal of fixtures without damaging the existing one
In this case it is necessary to proceed with particular skill in removing these skirting boards, trying to recover them as best as possible.
The last operation involves the removal of the existing subframe, in order to accommodate the new one. This phase can be overlooked when it is possible to use the old subframe, which often occurs when replacing aluminum frames.
When the replacement of the fixtures is consequent to the realization of a thermal coat, in order to contain energy consumption, the problems to solve are different.
They arise in relation to the type of perimeter structure in which the fixtures are allocated, to the type of fixture, to the material with which they are made.
Below I illustrate the case studies more common, starting with a building with a masonry structure in which the external frames are made up of two parts, namely an internal one consisting of a wooden and glass frame and an external one consisting of wooden shutters.
Replacement of fixtures by improving thermal efficiency
In this case it is necessary to evaluate whether to totally replace the existing fixtures or to improve their thermal efficiency. This condition often occurs in older buildings where the size of the window frames and their value require a careful choice.
Having to opt for an improvement in thermal efficiency, it is possible to proceed with the application of double glazing, creating wooden frames to be inserted inside the compartments occupied by simple glazing.
As for the application of the coat, it is necessarily necessary remove the shutters, in order to apply the insulating layer on the facade as on the side shoulders of the slits.
To fix again shutters, basically two anchoring systems are possible:
- the first involves the use of hinges long to be anchored in the masonry, using resins to be injected into a hole made on site;
- the second consists in creating a perimeter counterframe always in wood, to be anchored in the underlying masonry.
Difficulty of laying to keep in mind
In the first case, the hole must be made by drilling the insulating layer with precision, together with the underlying masonry, and then inserting the anchoring resin into it to house the hinge.
The operation described above, apparently simple, involves several problems related to difficulty to perform with some precision such holes, in addition to running the risk of favoring the penetration dell’water swing, inside the insulating layer.
A safer system to arrange the shutters, it consists in creating a perimeter counterframe always in wood, to be anchored in the underlying masonry, and incorporated within the external insulating layer.
This operation has several advantages, such as keeping the dimensions of the opening compartment unchanged, as well as remove the problem of thermal bridges.
For the aluminum fixtures, in the case of replacement of the entire frame, it is worth considering the use of insulated thermal counterframes.
Replace the fixtures using insulated monoblocs
The prefabricated insulating counterframes are real monoblocks insulated, which are simply inserted, aligned, fixed and sealed in the hole provided in the masonry.
In this way, with a single operation, you can to complete the compartment with all its elements such as sides, shutters, etc. as well as creating a valid housing for thresholds and counter sills.
The convenience to use such insulated systems, derives from the good reduction of energy consumption compared to traditional systems, which can reach up to about 45%.
In addition to the energy advantages, with such a system it is possible reduce likewise the perception of external noises.
Thermal insulation and window replacement procedures
In making a outer coat, proceeding with the replacement of the fixtures through the use of these monoblocks, it is necessary to take into account the application of the external insulation, so as to make the monoblock protrude to the extent that will have the thickness of the insulation on the facade.
By doing so, all shoulder pads of the wall will result isolate and it will no longer be necessary to turn the insulating layer in the bundle, which is instead necessary when using new counterframes for the installation of new fixtures.
It is good to remember how the use of such systems actually produces one reduction of energy consumption, provided that the assembly of the same takes place in the manner indicated by the manufacturer.
Often variants on site, such as cuts of insulating parts, modifications of fixing materials, elimination of apparently unnecessary parts, lead to malfunctions over time.
These, in addition to manifesting themselves in the form of infiltrations, the presence of mold or bad smells, make the whole monobloc more vulnerable to wear.
Accurate design for a perfect installation
To prevent this from happening, a phase of executive design, very accurate, which takes into account the structural and architectural characteristics of the building on which it will be necessary to intervene.
The preliminary study can also allow the realization of particular structures, to be inserted in irregularly shaped compartments, without having to modify on site and often incorrectly, an already assembled monobloc.
The serious and qualified study of the reduction of energy consumption upstream of the intervention is basic to precisely establish the characteristics of the insulating layer in terms of material and thickness.
From this study it is possible to draw alternative solutions, regarding the use of different insulating materials. Often the reduction of a few centimeters of this material simplifies the replacement of the fixtures, and the consequent choice of the perimeter closure system, without distorting the architectural aspect and the decoration of the facades.
*The article has been translated based on the content of LAVORINCASA.it by www.lavorincasa.it. If there is any problem regarding the content, copyright, please leave a report below the article. We will try to process as quickly as possible to protect the rights of the author. Thank you very much!