Loft Conversion Roof Insulation Regulation

If you plan to re insulate your old loft conversion then you need to adhere to these standards.

Loft conversion roof insulation regulation.

Details of the planning permission and building regulation regimes for loft conversion in england. Details of the planning permission and building regulation regimes for loft conversion in england. When refurbishing an attic or loft space there is a requirement to comply with the appropriate building regulations standards for the location of the building. If you are installing loft insulation as part of a roof renovation project where more than 25 per cent of the roof is being renewed then the level of insulation should meet the standards required by building regulations approved documents.

It is not possible nor is it intended that this booklet should cover every aspect of the design. The insulation is installed under the roof in the slope. Warm loft insulation is used on pitched roofs where you are using the loft space as a room or for storage. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters.

To a layman this means that the layer of insulation either fibre or wool should be 270mm thick with a rigid board of 175mm or a spray foam filling of about 125mm thick. Regulations state that the u value of the roof needs to be 0 18w m2 or less. Regardless of whether or not you need planning permission your loft conversion will have to meet building regulations approval. With a warm roof the usual process is to split the insulation into two layers.

Building regulations are in place to make sure that any work done is structurally sound that the new room is fire safe and that sound is reasonably insulated between the loft and the rooms below. Again this should be insulated to the recommended depth of 270mm. You ll need the following to be sure that a loft conversion is viable in your home. If you are pursuing a renovation project and wish to renew more than 25 of your roof space your loft insulation must also meet the standards required by these regulations.

3 loft conv rev 2 2007 1 introduction 1 1 this guidance booklet considers the extension of a typical 2 storey dwelling into a 3 storey unit by the addition of a loft conversion within the existing roof space. In england the required minimum u value for pitched roofs insulated at rafter level is 0 18 w m k whilst for flat ceilings the minimum is 0 16 w m k. 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. When converting an existing roof space into a room or rooms the provisions for escape need to be considered throughout the full extent of the.