Loft Conversion Roof Insulation Building Regs

The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.

Loft conversion roof insulation building regs.

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. Building regulations approval is required to convert a loft or attic into a liveable space. It is not possible nor is it intended that this booklet should cover every aspect of the design. Care should be taken not to block any ventilation at the edges eaves.

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. Building control guide to loft conversions 5 4 0 obtaining building regulations approval loft conversions must comply with the building regulations. It s important to make sure that noise between rooms is sufficiently insulated. 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.

Building regulations for insulating a roof heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. This section provides guidance for making alterations to the loft space of an existing house which is no more than two storeys high. Loft conversion building regulations and planning permission. It is also an expensive option unless you are already having the roof covering replaced.

There are two methods of making a building regulations application as follows. Currently building regulations for loft conversions dictate that the u value of the roof must be 0 18w m2 or lower. Insulation batts ready to go in loft conversion if you do not have the height in the room to insulate under the rafters then insulating above the rafters by taking off the roof tiles and insulating beneath is an option. The extension does not reach beyond the outermost part of the existing roof slope at the front of the house.

Again this should be insulated to the recommended depth of 270mm. This equates to a thick 270mm layer of fibre or wool insulation about 175mm of rigid board insulation or around 125mm of high performance spray foam.