What Type Of Wall Insulation Should I Use – However, with the increasing use of thermal insulation in residential properties, it becomes more difficult to both reduce the cost of the heating bill and provide a good energy performance certificate rating.
Any insulation mentioned can prevent heat loss by convection. Convection in this context is the movement of warm air in a building. Warm air naturally tends to rise through the building, while cold air takes its place. As an example of how thermal insulation reduces heat loss by conduction by filling the cavity wall with insulation, the air in the cavity is restricted in its movement, which reduces the exchange rate.
What Type Of Wall Insulation Should I Use
Thermal insulation that works by radiation works by radiation, or in this case radiant heat. It is constructed with a reflective material such as aluminum foil.
Mold On Insulation
Of these three different methods, it is thermal insulation that works by conduction that is the most problematic for electrical installations. Thermal insulation that works by conduction does so because of its low thermal conductivity, making it difficult to transfer heat through the material, preventing or reducing its loss.
Different materials have different levels of thermal conductivity; This is known as its U-value. The lower the U-value, the more effective thermal insulation retains heat within the property. For example, to achieve a U-value of 0.15, filtered vermiculite would need to be applied to a depth of 430mm, whereas mineral wool would need to be 245mm deep to achieve the same value.
Some of the most common places to put thermal insulation, especially in properties that were originally built without insulation, are the areas where they are commonly run; High places, pitched roofs and wall voids are where problems can arise.
It is also not uncommon to find thermal insulation combined with plasterboard, known as thermal board. They are becoming more popular for use in new construction due to their ease of installation.
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Another thing to keep in mind is that some types of thermal insulation can have a negative effect on the PVC insulation used in your standard twin and ground cables.
Polystyrene insulation, commonly used as filler or in board form, migrates to the plastic used in PVC, causing premature deterioration of the cable insulation. In the best case, this will lead to the need for early cable replacement due to reduced service life. In the worst case scenario, it could cause a fire.
Rock Wool Insulation
Before installing the cable, where there is a possibility of contact between PVC and polystyrene, polyurethane or polyisocyanurate, you should, if possible, check the manufacturer’s data sheet for the thermal insulation product.
If this is not possible, which is quite possible depending on the age of the installation, it would be better to assume that the insulation will cause the plasticizer to migrate from the PVC sheath of the cable, causing the problem mentioned above.
The table below compares several common and emerging insulations in use today, the thickness to achieve a U-value of 0.15, and the effects of the insulation on the cable.
A concrete type material made from hemp, is widely used as the main building material and is poured in the same way as concrete using wooden shuttering.
Partition Wall Insulation
Because of the way it is manufactured and installed, the cables will not come into direct contact with them.
An airgel is where the liquid phase has been replaced by a gas. When used, it is usually found in thin sheets, often found in luxury commercial settings, although it is becoming more common in domestic use as prices drop.
Phenolic foam is often used as a ‘heat board’ support, found in older installations and sprayed into holes. Older packaging where the foam has been sprayed will be pale yellow.
It is a thermosetting plastic that is formed as a foam rather than a solid. It can be found as a separate sheet or as a base layer on a ‘heat board’.
Keeping The Heat In
Care must be taken to ensure that the PVC sheathed cable does not come into contact with the foam insulation. Insulation can cause migration of plasticizers used in the manufacture of PVC cables. At the very least this will lead to premature damage to the cable insulation and at worst a fire.
Similar to expanded polystyrene board but manufactured differently, it can be found as a separate sheet or as a base layer in ‘warm board’.
Technically known as glass wool, it is made up of thousands of thin glass fibers, held together with a bonding agent. They are often found in rolls or in the form of batts, which are used in loose roofs or on pitched roofs and walls.
One of the most common types of thermal insulation, often found loose in the loft between the joints, with another layer on top. Although the material, like polystyrene insulation, will have no physical effect on the cables, depending on the thickness, it will affect the current carrying capacity of your cables. Make sure your cables are in contact with a heat conducting surface on one side where possible.
Exterior Insulation For Existing Foundation Walls
Mineral wool is made from many small fibers of a variety of minerals, which are melted at very high temperatures and spun to form the fibers when melted, similar to candy floss. Like fiberglass mineral wool, it can be found in rolls or batts, used in free-standing rooms or in installed ceiling and wall panels.
Colorless carbon/carbon fiber such as mineral wool/fiberglass, often found in rolls, is used in attics, pitched roofs, and walls.
Fiberglass and mineral wool insulation are used in a similar way. It is not nearly as common, but is becoming more popular due to its green qualities. As with fibre/mineral insulation, this will not cause any damage to your cable material, but depending on the thickness of the cable and the way it is run, it can affect the current carrying capacity of the cables, again, where possible, make sure. The cable is run on one side in contact with your thermally conductive surface.
Leftover pieces and cuttings from wood processing are ground into a pulp, mixed with water and binder, then cured and cut into shapes to make wood fiber insulation. Often found in batts or boards, used in lofts, asphalt roofs, and cavity walls
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It will generally be easier to avoid with your cables than thermal insulation due to the stiffness of the material. The potential for the problem arises when the studs are used as insulation in the inner walls. If cables are to be run through them, ensure that one side of the cable is in contact with a heat-conducting surface.
Wool insulation is usually made from pre-treated wool, which is considered a good ‘natural’ alternative to traditional insulation, commonly found in attics and pitched roofs.
It is used in fiberglass insulation and mineral wool alike. It is not nearly as common, but is becoming more popular due to its green properties. As with fibre/mineral insulation, this will not cause any damage to your cable material, but depending on the thickness of the cable and the way it is run, it can affect the current carrying capacity of the cables, again, where possible, make sure. The cable is run on one side in contact with your thermally conductive surface.
Recycled paper, which is blown into holes, hangs behind panels on pitched roofs, or is placed loosely in lofts.
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It is generally used in two ways, either blown into holes or spread into the space between and above the rafters. Cellulose is treated with an anti-mold and anti-moisture compound. It is becoming increasingly popular due to its low cost compared to other types of insulation. When individual pieces gradually settle and stick together over time, the resulting loss of air space reduces its thermal efficiency. The material itself is not harmful to PVC insulation in common twin and earth cables. However, if your cables are covered in this insulation, it is best to ensure that one side is in contact with the heat dissipating material.
Like wood fiber, it can be found in both tin and board, which is used in lofts, pitched roofs and cavity walls.
Due to the stiffness of the material, it will generally be easier to avoid with your cables than thermal insulation.
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