WALLSHELL® FAQs

Why Fiber Cement Cladding?

  1. Fiber cement panel, a.k.a fibre cement cladding, is a building material used to cover the exterior of a building in both commercial and residential applications. It can be used with or without insulation materials when applying to the building’s exterior. Wallshell® fiber cement panel is a composite material made of cement reinforced with cellulose fibers.

  2. Fiber cement siding has several benefits since it is resistant to termites, does not rot, is impact resistant, and has fireproof properties.

Why Rock Wool Insulation?

  1. Its high thermal efficiency reduces energy bills for heating and cooling in residential buildings due to the outstanding thermal resistance of the rock wool. The thermal resistance of a construction material is measured by what’s known as the R-value, with a higher number indicating that a substance can better resist thermal transfer. According to the U.S Department of Energy, fiberglass offers an R-value of 2.2 to 2.7 per inch, while rock wool has an R-value of 3.0 to 4.0 per inch.

  2. Rock wool offers noise insulation due to its innovative materials that have higher densities and random fibre standard orientation that trap sound waves and deadens vibration time. For this reason it is perfect choice for spaces where the occupants are looking to minimise noise such as offices, bedrooms, meeting rooms or accommodation close to busy roads.

  3. Rock wool offers fire protection to the building and improved safety because of its rock fire resistant property.

  4. Rock wool is a breathable material allowing moisture to escape from the construction. This reduces the risk of mould and bacterial growth on the inside of the property.

  5. Rock wool constitutes a compression-resistant material that can be used as bonded panels. So it is ideal for thermal applications on domestic buildings such as extensions and loft conversions.

  6. It offers quick and easy installation providing airtightness to the building envelope.

  7. It has minimum environmental impact because it reduces carbon footprint due to its natural origin and hazardous-free classifications that offer minimum embodied carbon. Additionally, it reduces the use of non-renewable energy sources such as gas and electricity contributing to air pollution reduction.

  8. Rock wool itself is sourced from naturally raw materials and perhaps more importantly it can be completely recycled when the building is no longer in use without producing waste.

What is Powder Coating?

Powder coating is a type of coating that is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form. The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a "skin". The powder may be a thermoplastic or a thermoset polymer. It is usually used to create a hard finish that is tougher than conventional paint. Powder coating is mainly used for coating of metals, such as household appliances, aluminum extrusions, and automobile bodies. Newer technologies allow other materials, such as high-density fiber cement board,, to be powder coated using different methods. 

How To Determine the Correct Insulation?

With insulation & continuous insulation (CI) requirements being enforced, you need to make sure you’re installing the correct types and amounts of insulation to meet regulations.

To simplify these requirements, follow three steps:

  1. First determine your climate zone from the image below, if you need assistance here is a handy guide from energy.gov to determine your climate region by county, click here.

  2. Refer to the requirements for each building envelope area for your region;

  3. Determine the R value compliance requirements;

  4. Select insulation types and determine the thickness of the materials per required R values;

What is Correlation of Wind Speed and Wind Pressure?

Equivalency between wind speed and pressure is not linear. Wind pressure increases faster than wind speed. See details in the correlation diagram of wind speed and wind pressure that shows the pressure ranges for types of window and cladding tests.

How to Compute Insulation R-values?

In building and construction, the R-value is a measure of how well an object, per unit of its exposed area, resists conductive flow of heat: the greater the R-value, the greater the resistance, and so the better the thermal insulating properties of the object. R-values are used in describing effectiveness of insulation and in analysis of heat flow across assemblies (such as walls, roofs, and windows) under steady-state conditions. Heat flow through an object is driven by temperature difference between two sides of the object, and the R-value quantifies how effectively the object resists this drive: divided by the R-value and then multiplied by the surface area of the object's side gives the total rate of heat flow through the object (as measured in Watts or in BTUs per hour). Moreover, as long as the materials involved are dense solids in direct mutual contact, R-values are additive; for example, the total R-value of an object composed of several layers of material is the sum of the R-values of the individual layers. Note that the R-value is the building industry term for what is in other contexts called ″thermal resistance per unit area.″ It is sometimes denoted RSI-value if the SI (metric) units are used. see R-Values.

An R-value can be given for a material (e.g. for polyethylene foam), or for an assembly of materials (e.g. a wall or a window). In the case of materials, it is often expressed in terms of R-value per unit length (e.g. per inch of thickness). The latter can be misleading in the case of low-density building thermal insulations, for which R-values are not additive: their R-value per inch is not constant as the material gets thicker, but rather usually decreases.

The units of an R-value are usually not explicitly stated, and so it is important to decide from context which units are being used: an R-value expressed in I-P (inch-pound) units is about 5.68 times larger than when expressed in SI units, so that, for example, a window that is R-2 in I-P units has an RSI of 0.35 (since 2/5.68=0.35).

The more a material is intrinsically able to conduct heat, as given by its thermal conductivity, the lower its R-value. On the other hand, the thicker the material, the higher its R-value. Sometimes heat transfer processes other than conduction (namely, convection and radiation) significantly contribute to heat transfer within the material. In such cases, it is useful to introduce an ″apparent thermal conductivity″, which captures the effects of all three kinds of processes, and to define the R-value in general as “thickness of specimen divided by apparent thermal conductivity”. This comes at a price, however: R-values that include non-conductive processes may no longer be additive and may have significant temperature dependence. In particular, for a loose or porous material, the R-value per inch generally depends on the thickness, almost always so that it decreases with increasing thickness (polyisocyanurate being an exception; its R-value/inch increases with thickness). For similar reasons, the R-value per inch also depends on the temperature of the material, usually increasing with decreasing temperature (polyso again being an exception); a nominally R-13 fiberglass batt may be R-14 at -12° C (10° F) and R-12 at +43° C (110° F). Nevertheless, in construction it is common to treat R-values as independent of temperature.