![]() What Can Be Put On Top of the Rafter Insulation?Īll three of the insulation types above can be covered with plasterboard or plywood although for the foil membranes counter battens are needed to help keep it in place and provide a way for the boards to be attached. ![]() It’s ideal for lofts that are used solely for storage purposes as a useful way of maintaining the temperature of your stored items. ![]() Single-Layer Foil Insulation is an aluminium-based membrane that, when applied to the roof rafters, can help to regulate the temperature within the loft space. We normally recommend this type of insulation for “hobby rooms” which are used more often than those just built for storage. Multi-Layer Foil Insulation is an aluminium-based membrane that when applied to the roof rafters, can help to regulate the loft space by stopping temperature influence from outside of the property. Compared to the foil insulation outlined below, this is the most expensive option, both in terms of the cost of material and the labour involved in installing it.Ī roll of foil insulation Multi-Layer Foil Insulation (You can read more about u-values and the science of insulation on our guide page.) PIR comes in a range of different sizes from 12mm to 150mm. A 62.5mm insulated plasterboard would then be installed across the room side of the rafters to achieve the required u-value of 0.20 W/m2K or lower. Rafters would normally need to be extended to 120mm to accommodate a 70mm PIR inserted and a 50mm air gap. It’s made of PIR (polyisocyanurate) and normally inserted between the rafters with a minimum of a 50mm gap between it and the roofing material. Installing rafter vents full#This type of insulation is generally used when a full loft conversion is being done. There are commonly three main types of rafter insulation used in the UK: PIR Rigid Board Insulation Single-Layer Foil Insulation and Multi-Layer Foil Insulation. What Types of Rafter Insulation Are There? We go into more detail on cold vs warm lofts in our insulation guide. We refer to this type of loft as a “warm loft”. This insulation will retain heat within the loft in the colder months and reflect heat in the hotter months. ![]() Plus, it will help to increase thermal efficiency. Exposed insulation was applied on top of the rafters Why is Rafter Insulation Necessary?Īdding rafter insulation to the underside of your roof will help regulate the temperature in the loft. ![]()
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