Reflective Insulation and Bulk Insulation
Conducted and Convected heat is mainly resisted by bulk ceiling insulation, which traps the heat in pockets within its structure. Thermal resistance is really the same, doesn't really matter which way the heat flows through it. Reflective insulation and bulk insulation are the two types of insulation on the market.The two leading bulk insulations on the market are glasswool insulation (think pink aerolite) and isotherm ceiling insulation. Bulk materials come with a material R-value for the thickness you require.
Reflective Insulation
Insulations with reflective properties are used to resist radiant heat flow, this is because of its high reflectivity and it also has low emissivity (ability to re-radiate heat). Reflective insulation relies on a 25mm layer of air next to the shiny surface. Heat flow through the product changes, depending on which way the heat is flowing through the product.Reflective insulation is an aluminum foil (shiny) laminated to plastic or paper and comes in long rolls. When dust settles on the reflective surface it slowly starts to reduce its performance. Always face the reflective surfaces downwards or keep them vertical. With single sided foil the anti glare surface should always face outwards or upwards.
Reflective insulation R-values are supplied as up and down values. Depending on where and how the reflective insulation is installed will change the products total R-value. Make sure system values given by the manufacturer relate to your situation.
- 45% on cooling and heating energy can be saved with roof and ceiling insulation
- 20% additional cooling and heating energy with wall bulk insulation
- 5% on winter costs with the right floor insulation used on your home
