Insulation Under Roof Tiles

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.

Insulation under roof tiles.

You should leave the space under the roof tiles free from insulation to give adequate ventilation so that you don t get condensation or water coming through the tiles. The main difference between the two is the location of the insulation. A strong tear resistant pliable building membrane designed for use as sarking under concrete and terracotta tile roofs. Insulating in and around your roof attic space also prevents long term damage from moisture build up or ice damming which results from the warm air trying to escape through the apex of the roof but instead heating up the snow.

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. You can use batts polystyrene slabs expanded polystyrene or spray foam to insulate your roof or loft space. When installed adjacent to an air cavity sisalation tile roof contributes to the overall total r value of a building. Thereby providing increased comfort to building.

The technically correct approach depends on a number of factors. The insulation is installed under the roof in the slope. 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. Whether or not there is an inner roof lining and the total thickness of the roof structure.

The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. This will depend on the construction on your roof and if it is a refurbishment whether the roof tiles are going to be removed. Provides compliance to bal bush fire ember attack requirements in accordance with as3959 by providing a secondary form of ember protection for the roof space roof sarking is mandatory under the building code of australia bca for all tiled residential roofs regardless of roof pitch with a rafter length greater than 6 metres. Insulating the pitched roof if your attic is often used or perhaps you plan to convert it in the future you will need to insulate the inner surfaces of the roof.

Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. The main decision to make when insulating a pitched roof is if you are going to have a warm roof or a cold roof. Protects homes and buildings against radiant heat.