Dave Jones Posted September 3, 2023 Share Posted September 3, 2023 (edited) Sure this is going to catch a few unawares. new Part O (overheating) states: Any guarding to be sized to prevent the passage of a 100mm sphere, to be 1.1m high from floor level, to be not easily climbable and to be capable of resisting at least the horizontal force given in BS 6180:2011. Park K states: "section 3.1 At Opening windows except roof windows in loft extensions, see approved document B1" max height 800mm Park B states "section 2.10 bottom of opening area is a maximum of 1100mm above floor". NHBC also muddies the water, they say you can ignore Part O guarding heights if you do not rely on windows for heatloss (MVHR). also they introduce a tolerance for guarding of 100mm lower. https://www.nhbc.co.uk/binaries/content/assets/nhbc/tech-zone/nhbc-standards/tech-guidance/6.7/tg-6.7-20-guardingconsiderations.pdf So there seems to be no way to get around guarding and passing regs. Height from Floor Part O Part K Part B 800mm FAIL PASS PASS 900mm FAIL FAIL PASS 1000-1100mm PASS FAIL PASS 1200mm PASS FAIL FAIL Edited September 3, 2023 by Dave Jones Link to comment Share on other sites More sharing options...
ProDave Posted September 3, 2023 Share Posted September 3, 2023 Ask your BCO what height he wants is. Link to comment Share on other sites More sharing options...
Dave Jones Posted September 3, 2023 Author Share Posted September 3, 2023 BCO is ok in fairness, its the warranty inspector who is anal about every little thing. Probably end up with guarding and remove it after the final visit. Link to comment Share on other sites More sharing options...
Big Jimbo Posted September 3, 2023 Share Posted September 3, 2023 Thats what i am intending. @Dave Jones I was doing my own Part O calcs. I couldn't find a way to make it work. All my windows open to meet ventilation. On my upstairs windows, i intend fitting them at about 900mm from the floor, and guarding them to exactly 1100mm. Once passed out, i will remove the guarding. Link to comment Share on other sites More sharing options...
SteamyTea Posted September 4, 2023 Share Posted September 4, 2023 On 03/09/2023 at 08:07, Dave Jones said: capable of resisting at least the horizontal force given in BS 6180:2011. What is that force specified? Link to comment Share on other sites More sharing options...
Dave Jones Posted September 4, 2023 Author Share Posted September 4, 2023 1 hour ago, SteamyTea said: What is that force specified? 3 jedi's and an ewok. Link to comment Share on other sites More sharing options...
ETC Posted September 4, 2023 Share Posted September 4, 2023 I really can’t see a problem. Windows need to be guarded where the opening sash is less than 800mm from a floor. An EEW has a range of between 800mm and 1100mm from the floor to the underside of the opening sash. Have your cill height at 1000mm and make the window opening suitable for the required ventilation. Can someone explain it to me please? Link to comment Share on other sites More sharing options...
ETC Posted September 4, 2023 Share Posted September 4, 2023 Link to comment Share on other sites More sharing options...
Dave Jones Posted September 4, 2023 Author Share Posted September 4, 2023 in a nutshell a window of 1000 fails part O guarding, 900 fails part O and K per original post. There is no combination that doesn't fail either O, K or B. It's a right dogs dinner. Link to comment Share on other sites More sharing options...
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