A roof that has used the wrong materials, is replaced incorrectly or is of poor quality could mean it doesn’t pass building regulations approval for roofs and you might have to start all over again.
So what do you need to know to ensure your roof meets all requirements?
- If you are replacing more than 25% of your roof, you will need building regulation approval and if your home is listed or in a conservation area you may also need planning permission.
- In most cases, a new roof will also require additional thermal insulation so it complies with the latest energy efficiency requirements. You have a choice of a cold roof system where the insulation is placed between the joists of the loft floor or a warm roof system where insulation is used between the rafters (just under the tiles and vapour barrier).
- You need to consider the weight of the new roofing material and whether this will affect the current rafters or roof structure. You may need to improve these to allow the roof to accept a heavier roofing material. For example, slate is a very popular roofing material but is heavier than many standard tiles.
- Your roof may require ventilation – especially for a cold roof system where the insulation is placed between the loft and the home. You may need additional vents or even a rooflight.
- You need to take into account the weight of snow or ice on your roof and the “wind load”. This may require strapping and will depend on whether your roof is warm or cold (a cold roof will hold more snow and ice).
- Safety is also an important consideration – you should always provide scaffolding to ensure all workers are not at risk.
It is vital that your new roof meets all of these requirements and that you choose a contractor who understands how this all works. Don’t forget to contact your local buildings regulations team to check that your roof is built to last. With at least 30 years of use before it is replaced, you should make sure you do it right first time.