Tonychippy Posted April 13, 2023 Share Posted April 13, 2023 Hi all, new to using this but figured why not get some opinions. i have built a flat roof extension with a parapet wall (block) and want to ask the simple (I hope) question … “can I lay stone copings onto roofing felt?” The parapet construction from externals side inward is sand cement render, 100mm block, 100mm cavity, 100mm block. When I built the roof I had to vent it so I have a 25mm vent on the inside side of the parapet, I capped it with cavity closer and OSB. The roofer the three layer felted my flat roof up to the underside of my vent and the top of the parapet. Where no vent the felt runs up and over the top of the parapet as you’d imagine. I was going to do ali coping but gone off it for a number of reasons, one cost. Please let me know your thoughts and if what I’ve said is not clear let me know. Thanks in advance and appreciate any comments!! tony Link to comment Share on other sites More sharing options...
Dave Jones Posted April 13, 2023 Share Posted April 13, 2023 leave the felt for your shed. The correct detailing for a parapet is here https://nhbc-standards.co.uk/7-roofs/7-1-flat-roofs-and-balconies/7-1-17-parapets-and-guarding-to-terraces-and-balconies/ Link to comment Share on other sites More sharing options...
Tonychippy Posted April 13, 2023 Author Share Posted April 13, 2023 Hi Dave, it’s not a shed and the get is torched on….? I know the way you’ve said is normal it just didn’t happen that way (money and September October lasted I think it rained for about 3 months and my new roof was leaking) so you think it can be laid in the felt Link to comment Share on other sites More sharing options...
Temp Posted April 13, 2023 Share Posted April 13, 2023 3 hours ago, Dave Jones said: leave the felt for your shed. The correct detailing for a parapet is here https://nhbc-standards.co.uk/7-roofs/7-1-flat-roofs-and-balconies/7-1-17-parapets-and-guarding-to-terraces-and-balconies/ DPC can be Hessian & Bitumen. If you can lay coping stone on a DPC as per the NHBC drawing I think it should be possible to lay them on bitumen/felt. Google found this page recommending a mechanical fixing but I've not done coping myself.. https://www.roofgiant.com/blog/news/how-do-you-secure-coping-stones/ Link to comment Share on other sites More sharing options...
Tonychippy Posted April 13, 2023 Author Share Posted April 13, 2023 Temp, that was exactly the thought I had! Link to comment Share on other sites More sharing options...
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