Part L1B of Building Regulations and Flat Roofing

Part L1B of Building Regulations and Flat Roofing

Part L1B of the Building Regulations – a short guide for flat roofing.

A lot customers have never heard of Part L of the Building Regulations and I find myself explaining these regulations all the time, so I have uploaded this video and hope that it helps anybody looking to find out more. Part L and flat roofing are becoming more and more tied together. We always try to form a warm roof for our flat roofs, we find that a warm roof construction for flat roofing is by far the best flat roof.

There is a lot less to go wrong with a warm deck flat roof than with a cold deck flat roof. Building Control and Part L only dictate the U value of a roof, however if you form a cold deck flat roof then you also have to ventilate the roof.

Warm deck flat roofs and cold deck flat roofs can be covered with EPDM rubber, mineral felt, asphalt, Kemper and lead, zinc and copper.

If you need any more help on this subject please don’t hesitate to contact me, Steven Dickinson at London Flat Roofing Ltd.

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Comments (2)

  • Steve Corbett. Reply

    Hi Steven, i have a worrying question to ask you concerning the construction practices of warm flat roofs if i may please? I am a time-served carpenter of many years starting out in the 70`s. I have a kitchen extension going on at home approx 5m x3m, all approved by building control. After studying the construction procedure of the WARM flat roof with the VCL in mind, my two questions are this.. Owing to our usual climate, how is it possible that any trapped moisture/wetness can dry out after the Firestone rubber sheeting has sealed over the top osb layer? Also, as time goes by, the rubber sheeting may get damaged, or flashing may become defected, how the heck can we tell that there is a water ingress problem when rainwater is leaking through the rubber sheeting filling in between the insulation sheets being trapped in by the VCL. Basically the whole roof has been “tanked” as i see it? Ok, i can see thermal values come out on top here, but surely over time this design could lead to a maintenance disaster?? I would value your comment Steve,, Many thanks, Steve Corbett, North Wales.

    31st May 2023 at 8:40 pm
    • Steven Dickinson Reply

      sorry for the late reply I get so much spam on this that is really hard to find the real people who need help. However I’m here now if you need help still please just email email me speak soon

      19th August 2023 at 8:52 pm

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