Nealt

Thanks Russell, yes they are supposed to prevent smoke and fire spreading. We havent fitted them, but the BC guy is saying we should have them because its in regs. Is your house clad with box profile sheeting

We have put the profiled foam infill pieces at the top and bottom of roof sheets as per manufacturer. So now the BC inspector says that has blocked of that means of ventilation. So we were proposing that the roof sheets are cross ventilated by air coming up through the gable end sheets. Now hes asking how will that work if you have cavity barriers

Weve done that and now they are asking about cavity barriers, so they say we should have cavity barriers and so the airflow will be restricted by the barriers

Hi Iceverge, thanks for your response. We have had airtest done and its 0.5ACH so within passivhaus standards and we have MVHR. Weve been telling the BC people that no moist air is coming from inside but they keep hitting us with the building standards requirements

We have built a timber framed house, clad walls and roof with box profile sheets, no soffits on the roof. We were initially asked how we were venting the underside of the roof sheets without soffits. So we argued that air is drawn across the roof through the gable end walls sheets. Now BC are asking hows that going to work when cavity barriers are required behind wall sheets. We have not fitted any cavity barriers. Is this a valid requirement

He wont tell us how. I think what we have provides plenty of air movement

The battens are on the sarking fixed through to the trusses. Yes there is a continous gap up to thr ridge, formed by the peak of the sheets

Thanks for the response Eric. I dont think removing the inserts is a good idea here. The wind will drive rain under the sheet. Thinking about it the air under the sheets when warm must rise and vent out under the ridge by convection. Yes we have the whole house clad in steel

We are building a house on Shetland. Weve got all our roof/wall sheets on. Now our BW Inspector is insisting on ventilating under the roof cladding. The sheets are fixed to 50mm battens. We used foam sealing strips top and bottom, but they arent air tight. Given the wind in Shetland I cant believe there is a lack of air movement under the sheets. Anyone have any thoughts, suggestions on this issue

We are looking for a plot in the Shetland Islands so that we can build our own house. Long been a dream of ours. Done lots of renovating over the years. Served my time as an Electrician, now an Engineer. Our son is a joiner, wife good at design, and can turn a hand to most things