Dave Jones Posted May 30, 2023 Share Posted May 30, 2023 They have done a nice job off the edpm in fairness it looks smart. How far under the tiles have they lapped it up and did they osb under the tiles ? I think abutment vent's will be hard to get working right as they will push the bottom tiles up. Easiest and cheapest is to use some mushroom vents. I'd do 4 along either side of the lantern and 2 behind it They really easy to flash in with the edpm tape. Lastly i also think you need more airflow in the pitched roof, assuming its not a warm roof. There doesn't appear to be any eaves vents where the 3 faces join the flat roof. You need air to flow up and over to take out the moisture that will inevitably collect in there when it gets cold. I would put in 9ish tile vents while you have niece easy access, they are cheap and you will have no worries come the winter. https://www.roofingsuperstore.co.uk/browse/ventilation/flat-roof-vents-extraction/flat-roof-ventilation.html Link to comment Share on other sites More sharing options...
richo106 Posted May 30, 2023 Author Share Posted May 30, 2023 Thanks Dave good ideas there! I have attached some more photos of how it joins the pitched roof. As you can see there is a good gap through above the PIR in the pitched roof…if I kept a 50mm air gap on the flat roof would this give good enough ventilation you think? I could install the 9 air tiles as you said? Link to comment Share on other sites More sharing options...
richo106 Posted May 30, 2023 Author Share Posted May 30, 2023 Link to comment Share on other sites More sharing options...
richo106 Posted May 30, 2023 Author Share Posted May 30, 2023 Would my building inspector be able to advise on this? Link to comment Share on other sites More sharing options...
Dave Jones Posted June 1, 2023 Share Posted June 1, 2023 problem you have, how external air going to get to the bottom of those eaves ? They would normally be externally exposed so fresh air continually flows through. Link to comment Share on other sites More sharing options...
richo106 Posted June 15, 2023 Author Share Posted June 15, 2023 I’m still going round in circles with this, my builders and a retired building inspector said as long as I leave an air gap above then that’s fine. I have my building inspector coming but still have no idea on how I am going to insulate this area🙈🙈 Link to comment Share on other sites More sharing options...
Mike Posted June 15, 2023 Share Posted June 15, 2023 From where you are now, and from what you've posted, I'd with @Dave Jones's suggestion, though it will mean getting the roofers back: On 30/05/2023 at 15:30, Dave Jones said: I would put in 9ish tile vents while you have nice easy access, they are cheap and you will have no worries come the winter. https://www.roofingsuperstore.co.uk/browse/ventilation/flat-roof-vents-extraction/flat-roof-ventilation.html Link to comment Share on other sites More sharing options...
richo106 Posted June 16, 2023 Author Share Posted June 16, 2023 Hi @Mike Yes I agree, I am going to take @Dave Jonesadvice/idea and install the mushroom vents. I just need to decide the best way to insulate it now? I have attached my buildup. I need to get my MVHR ducts and outlets in there, my outlets need to be at least 110mm below finished ceiling level I also need to bring it down around 75-80mm to work with my frontage of the house so it flows through nicely Link to comment Share on other sites More sharing options...
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