Under-roof-tiles-insulation, the quest for greater energy efficiency in buildings has led to increasing interest and need for insulation, improvements in hvac equipment, more airtight construction, new materials and assemblies. senior engineer manager at icynene, john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense.. The materials used to insulate under the roof include batts of mineral or glass wool insulation, held in place by 'battens' of wood attached to and across the rafters. alternatively, polystyrene..., roof sarking is a pliable membrane that is positioned under your roof during installation of the roof by the builder. it is rolled out in sections with an overlap between each layer and provides a number of key benefits:.

It depends whether the roof is being insulated at the rafters or at ceiling joist level. tiles on battens on breathable roofing membrane over the rafters is normal construction as far as that goes. leofric, 1 mar 2019 #3, non-breathable roofing underlays are typically used for: applications where traditional ventilation methods are preferred. roof constructions where low-level eaves ventilation is used in conjunction with high-level ventilation, often at the ridge-line.. Roof and loft insulation can save you money, keep your house warm and help the environment.however, it can also seem like a very complex subject which many different types of insulation available. to help you learn about the types of insulation which will be best for your home, we have compiled this guide to roof and loft insulation which are a great place to start when insulating your home.