Let's find what you're looking for

    What are the building regulations
    for flat roofs?

    arrow Back to blog 23rd December 2016

    The building regulations for flat roofs can seem like a lot to understand, which is why we have put together a simple guide of the things you need to know about when it comes to considering the building regulations for flat roofs.

    How are flat roofs defined?

    In BS 6229, a roof is defined as flat if it has an overall pitch of 10 degrees or less.

    The two variations of flat roof

    Usually, flat roof constructions are defined as either ‘Cold’ or ‘Warm’, depending on how the thermal insulation is positioned in the construction.

     

    Cold flat roofs are found in many homes around the UK, though they are not recommended these days and are actually banned in Scotland.

     

    Cold roofs involve the thermal installation being installed between the joists and below the structural deck. Because the insulation doesn’t bear any load, quilts and other forms of loose fill material can be used instead of rigid insulation. Ventilation is a requirement in order to prevent moisture build-up in the roof void.

     

    The downside of cold roof construction is that the heat rays of the sun hit the structure unprotected, and thermal movement can have a negative result.

     

    In warm deck roofs, however, the insulation is positioned above the structural deck, and no ventilation is necessary as a result.

     

    The roof deck is kept at a temperature similar to the inside of the building throughout the year and this protects the roof structure from the hot and cold extremes, cutting down the thermal movement.

     

    Warm deck roofs also help reduce the risk of condensation build-up, with any water vapour entering the roof having no cold surface on which to settle.

    What are the requirements for a flat roof?

    Flat roofs should be tough, stable and durable. Needless to say, it must provide adequate protection against external elements, keep the building’s interior dry and – of course – playing its part in the stability of the building.

     

    I’ve heard that flat roofs can fail early, is this the case?

     

    Not anymore! In previous years, flat roofs had earned a reputation for simply not lasting as long. However, ongoing improvements to materials and design have seen them improve in every aspect, including:

    • Strength
    • Flexibility
    • Ageing
    • Weather resistance

    Do I need planning permission when adjusting a flat roof?

    Typically, the answer is no. If you’re planning to carry out repairs on or re-covering less than 25 per cent of the roof, then you won’t need planning permission.

    When will I need it?

    You will have to obtain planning permission if:

    • You’re carrying out structural alterations.
    • The performance of the new covering is going to be significantly different to the old one in the event of a fire.
    • You’re replacing more than 25 per cent of the roof area, which typically means that the roof thermal insulation will normally need to be improved at the same time.

     

    Note: Don’t forget that we have a detailed guide to the ins and outs of planning permission for roof windows.

    Give us a call

    If you’re at all unsure about how your roof will be affected by the installation of a flat roof skylight or new window, give Sunsquare’s friendly team a call on 01284 846551. We have years of experience in this as market leaders and can assist you more once we understand your situation.

    Share this guide

    Want to know more

    If you want to know more about this or anything else then get in contact.

    Call us on +44 (0)1284 723377

    Email sales@sunsquare.co.uk

    refine search

    All
    Events
    News
    sun square attend brexit business meeting

    11 March 2019

    Sunsquare attend Brexit Business Roundtable

    On 22nd February 2019 Sunsquare took part in a Brexit business roundtable. This prestigious event was attended by Chris Heaton-Harris MP, Parliamentary Under Secretary of State at the Department for Exiting the European Union.

    Read morearrow
    RIBA Architects Optimistic About Future Workloads

    21 October 2018

    RIBA Architects Optimistic About Future Workloads

    Continuing positive trends recorded in 2018 so far, the latest RIBA Future Trends Workload Index rose from +13 in April…

    Read morearrow
    UK Builders and Homeowners Support Licensing for Construction Industry

    16 October 2018

    UK Builders and Homeowners Support Licensing for Construction Industry

    Approximately 80% of builders and consumers would support the introduction of a mandatory licensing scheme for the UK construction industry. This was revealed in a research report titled License to Build: A Pathway to Licensing UK Construction, recently published by the Federation of Master Builders (FMB).

    Read morearrow
    Sun square at Homebuilding and Renovating Show 2018

    12 September 2018

    The Sunsquare team are heading to the Homebuilding & Renovating Show 2018

    We’ll have an exciting exhibition stand at the show from the 21stth to the 23rd September at the ExCeL centre, showcasing a selection of our thermally broken, BSI Kitemarked skylights and roof lanterns.

    Read morearrow
    Sunsquare to attend grand designs live 2018

    19 April 2018

    Sunsquare set to attend Grand Designs Live 2018

    We’ll be setting up our exhibition stand from the 5th to the 13th May at the ExCeL centre, taking the opportunity to showcase our full line of thermally broken, BSI Kitemarked skylights and roof lanterns.

    Read morearrow
    BSI Updates Standard with Guidance on Inclusive Buildings

    23 February 2018

    BSI Updates Standard with Guidance on Inclusive Buildings

    Business standards body BSI has announced revisions to BS 8300:2018 Design of an accessible and inclusive environment.

    Read morearrow

    Sunsquare Accessories

    Find out morearrow

    Sunsquare Skylights

    Find out morearrow

    Since 2004, Sunsquare Limited has been pioneering skylight design

    Call us on +44 (0)1284 723377

    Why choose Sunsquare