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Acoustics

Cell structure, material, thickness, fire resistance, water absorption, frequency, category, compression, density, stiffness and their class.

The best solution is to create a disconnection in the propagation path of the vibration wave to the structure. This disconnection is usually achieved by means of a floating screed.

This technique is considered indispensable in apartment constructions, because it makes impact sound insulation almost independent from the choice of floor covering.

Impact noise is the result of direct contact between the source and the building structure. Due to the great energy, these sounds can propagate inside the building skeleton and can be perceived far beyond the adjacent spaces.

The impact noise in buildings can mainly be attenuated by means of the following two techniques:

  • Reduction of noise at source
  • Restriction of noise propagation

A distinction is made between housing, school building and other non-residential building types.

Normal acoustic comfort is achieved when 70% of users are satisfied. Increased acoustic comfort is achieved when special measures are taken to satisfy more than 90% of users.

Resonance of entrance halls and stairwells, airborne sound insulation, impact sound insulation, façade insulation and the background noise level.

Acoustics is the science that deals with sound. Sound consists of vibrations propagated by a medium. In most cases that would be air. Acoustics has many practical applications. Furthermore, acoustics refers to the influence that a room has on the sound and reverberation of sound. You can for example say things like “This room has poor acoustics". What is meant is that the properties of that room do not correspond to its use. For example, very different requirements are set for a concert hall than for a lecture hall.

Carro-Foam 6+ is the acoustic floor insulation that meets the strictest requirements for increased acoustic comfort. Carro-Foam 6+ reduces contact and shock noise between floors and spaces at the best value for money and has the latest WTCB reports, obtained in 2016 according to the acoustic standard NBN S01-400-1.

This underlayer, developed by Carro-Bel, consists of a layer of 6mm non-netted foam based on extruded closed-cell polyethylene with a density of 30 kg/m³.

The combination of extremely fine cell structure, high density and good compressive strength results, results in excellent acoustic properties.

Screeding

Carro-Bel Group foresees an average return of 250m² per day. A team consists of 4 people.

In theory, a screed can be applied to sprayed PUR after just a few minutes. In practice, we recommend waiting 24 hours.

The minimum screed thickness is preferably 5 cm above the pipes. With underfloor heating this is 7 to 8 cm. For a patio we recommended to provide at least 10 cm.

The correct terminology is 'screed'. If you do want to use chape, the correct spelling is with 1 'p'.

Fibres ensure that the 'shrinkage' thus prevents cracking and strengthens the screed in a 3 dimensional and homogeneous way. Fibres are also good conductors for underfloor heating.

The galvanised nets prevent 'expansion' and keep everything together. These are mandatory for underfloor heating, if PUR insulation is provided. Netting is also recommended for minimum chap thicknesses.

A minimum drying time of 1cm per week is required to achieve a moisture content of less than 2%. From 6 cm one should preferably take into account 2 weeks drying time per cm. The drying time depends on thickness, temperature and humidity.

For the application of our screeds we need to have running water, a well or a hydrant connection. Electricity is not required. A parking space of +/- 15 m is recommended for our truck.

There are 3 types of joints that are respected in screed work. Expansion joints: Synonyms are movement joints and dilatation joints. These are joints for underfloor heating. Polyethylene joints (mousse) must be provided. Construction joints: Joints that occur when large floorboards are placed against each other. Profiles with a rubber joint are provided here to absorb the overtension. Large movements can occur. Shrink joints: Synonym for dummy joints in specifications. When there is no underfloor heating, and the rooms are larger than 50m², these have to be applied. It is enough to make a groove cut into the screed where the screed can crack with only minimum damage.

A sloping screed is a classic screed with a slope of 1 to 2 cm per running metre. It is applied on roofs and terraces. This slope leads the water to the existing drainpipes.

A flat screed is required for most floor coverings such as tiles, parquet, lino, cast floors, etc. A flat pre-screed is also important when laying insulation boards.

A fast drying screed is 30% to 80% more expensive, depending on the type. This screed does save a lot of time, allowing other works to start sooner.

The screed thickness will be almost identical, the filling layer or insulation will differ. The floor structure on the ground floor is usually between 15 and 25 cm. The floor structure on the floors is usually between 10 and 15 cm.

Concrete

- classic polished grey for garages and basements

- classically polished for living rooms, but take care as it is not stain and scratch-resistant, and after-treatment may help here

- a finish in polished terrazzo concrete is aesthetically very pleasing for indoor environment and large spaces, different colours are achieved depending on the type of aggregate used

10 cm in normal circumstances.

- lightly polished for terraces so that there is some non-slip finish on it

- brushed or ribbed for slopes

- washed cement version for parking spaces and entrances/driveways, which is aesthetically very pleasing and highly non-slip

There are various options available for doing this, which can be discussed during a site visit.

Not necessarily, the use of a soap based on linseed oil will give a nice patina to the slab, and the slab can also be treated in addition against stains and pollution.

For small private works, this will be within a range of €70-80/m² in normal circumstances, subject to a site visit

As soon as the surfaces are more than 50m² in size, saw cuts of +/- 4mm deep or at least 1/3 of the thickness of the slab. 

Not a problem, just take care when making saw cuts to ensure they correspond to the layout plan for the underfloor heating. 

We can also do this work, we are responsible for delivering the materials and for installation. 

Concrete can be coloured en masse or be finished with a coloured wear layer.

Sprayed PUR

The required insulation thickness is determined in function of your EPB calculation. The minimum thickness of 3 cm just meets the K-45 level. The lower the insulation level, the better. U value is expressed in W/(m².K). R value is expressed in m²K/W.

The minimum spray thickness is 3 cm. We spray maximum heights up to 15 cm to guarantee enough compressive strength. 1 spray layer is about 4 to 6 cm. E.g.: We spray 8 cm in 2 layers.

Yes, in practice the load for sprayed PUR is between 150 and 250 kPa. Converted, this value lies between 15,000 and 25,000 kg/m².

Sprayed polyurethane is not an obligation, but it is the best floor insulation to date. PUR contains the best insulation value and helps you achieve the required E-level more quickly and with these insulation values you are more quickly eligible for various premiums. Alternatively, you can opt for an insulating screed, on the basis of polystyrene beads.

Sprayed PUR in situ contains a different cell structure which makes the compressive strength and insulation value incomparable. For example, there are PU foam canisters for installation with strong expansion, and others with a better insulation value.

Spraying PUR does not require water or electricity. As a customer, you only need to provide a parking space for our truck. A parking place of +/- 10 m is enough.

Sprayed PUR is applied seamlessly and therefore a thickness of e.g. 4 cm on your floor plate also result in 4cm insulation on top of your pipes. PUR is sanded in case of underfloor heating, acoustic mats or if the floor level is not very high. All elevations are carefully eliminated.

The isofloor department foresees laying an average 600m² per day. A team consists of 2 to 3 people. The yield depends on the areas of the rooms as well as on the number of windows and doors to be covered. Preparing your new plasterwork also requires good preparation.

PUR is an exothermic reaction between 2 components, polyol and isocyanate. These 2 components are sprayed at elevated temperatures, under high pressure. After a few minutes you can already walk on the PUR.

The Isofloor department sprays maximum thicknesses up to 15 cm. Sprayed PUR contains a possible shrinkage and this is limited to 15 cm. Passive houses are often equipped with 20 to 25 cm PUR. An alternative to this high floor structure is an insulating filling screed.

Plastering

This is indeed always included in our quotation; after the work has been completed, the site is left clean and tidy.

This is difficult to predict because the drying time depends on the temperature and humidity inside and outside the building itself.

The guidelines are 3 months. The drying process can be shortened by installing fans and/or dryers.

In principle not a lot, but we always ask that the site is openly available to us

and that power and water are available.

We always ensure that we have visited the site beforehand so that there are no misunderstandings.

We can do this. Work can start on average after 3 to 4 weeks.

The moisture in the bathroom quickly disappeared due to current ventilation standards.

As a result, no special measures are being taken. You can always choose to cement areas around the shower and the bath.

Absolutely, we are looking for an ongoing project in the area so that we can meet on site.

This is also entirely without obligation.

In principle this can be done, but this coating should be completely free of wallpaper and layers of paint.

There must also still be good adhesion between the current coating and the surface beneath.

TIP:  There should certainly not be a hollow sound when tapped.

It is possible to do both, but we are seeing that the trend is to install the screed first.

This is to ensure that all pipes are well protected and that the screed’s drying time can start earlier.

In this case we do, of course, provide protection for the screed when we are working.

Absolutely, we do. In this case, we would like to meet you on site to provide a proper estimate for the work.

By doing this, we can draw up an accurate quotation.

We always do this with the PE foil and tape made specifically for this.

After the work has been completed, these are removed again.

We make it a matter of honour to draw up a clear quotation beforehand and after a site visit, we make a final offer.

This is therefore the amount that will be on the invoice. If extra items are, of course, requested when the work is being carried out, they will be carried out at the same unit prices.

Foam cement

Light and porous cement-bound gravel layers such as foam cement are sensitive to weather conditions. When it is rained upon or a few days after the execution, the surface may pulverize or absorb a considerable amount of moisture. It is therefore important to provide the roof waterproofing as soon as possible. An alternative roof sealing in case of insufficient cohesion is a loose and ballasted or mechanically fastened sealing system up to the roof floor. Foam cement can be provided with an adhesive finishing layer to limit water absorption and guarantee cohesion.

The ideal roof pitch is 1 to 2% depending on the calculations. The WTCB recommends a 2% slope to avoid water stagnation. Water stagnation is not entirely unavoidable, which is why limited local stagnation is accepted.

Foam cement is mould-friendly, very lightweight, non-flammable, thermally insulating and easily pumpable.

Foam concrete and foam cement are 2 names for the same product, although they are different from each other. When made, foam cement is a liquid mixture of cement with air bubble former and contains no sand. It contains 30% more cement and 20% more air bubbles. The insulation value of foam cement is therefore better than that of foam concrete. The minimum thickness is 3cm, and is used for subfloors and sloping concrete.