3/16/2024 0 Comments Insulate rafters to roof tiesWhat 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. 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. The question is: what kind of professional should I contact to get a quote to do a job like this?Īnd then if insulation is needed, what kind of insulation would be better for it? I was thinking to use some insulation boards, and if I understood well I would need to leave a 50mm gap between the boars and the sarking felt.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. So as we are going to have some built-in wardrobes fitted on the walls with the slope in the master bedroom I thought it would make sense to remove the plasterboards from the inside, have a look at the insulation insulate it in case needed. When we bought the house a few years ago the previous owners said they insulated the roof (probably when they reroofed the house around 20 years ago), but I am not really sure about that as the upstairs rooms tend to be much colder than downstairs ones and on days when the temperature falls under 0 the tiles above the bedrooms are almost without any ice on their surface - but the tiles above the attic do. I live in a 1950 semi-detached house where the upstairs rooms have dormer windows and sloped ceilings. I would like some advice on how to insulate a roof between the rafters from the inside.
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