RichS Posted December 26, 2016 Share Posted December 26, 2016 So as I understand the building regs, with an integrated garage there has to be either a 100mm step down from house to garage, or a level access with the garage floor sloping away from the garage/house access. Does anyone know what is the minimum gradient for the slope. It doesn't seem to get a mention anywhere. Link to comment Share on other sites More sharing options...
Tennentslager Posted December 26, 2016 Share Posted December 26, 2016 Read on another post on Ebuild that the reason behind this reg is in case of a fuel leak in the garage. So logically not much of a slope needed...10° maybe? Just a guess. Link to comment Share on other sites More sharing options...
Steptoe Posted December 26, 2016 Share Posted December 26, 2016 I'd hazard a guess fumes also play a part, In a commercial garage with a pit , that pit becomes an explovsive atmospherere due to fumes gathering there, Link to comment Share on other sites More sharing options...
Steptoe Posted December 26, 2016 Share Posted December 26, 2016 Oh, and I think you need a fire door too, You may already know the answer to that Link to comment Share on other sites More sharing options...
Vijay Posted December 26, 2016 Share Posted December 26, 2016 Do you have to have an air brick/vent too with an integrated garage? Link to comment Share on other sites More sharing options...
ProDave Posted December 26, 2016 Share Posted December 26, 2016 You definitely need a fire door. In Scotland there is no option for a level threshold, you must have a step. A single garage does not need vents, but a double one will, I forget what size triggers that need. Link to comment Share on other sites More sharing options...
RichS Posted December 27, 2016 Author Share Posted December 27, 2016 Thanks for the replies. Yes, I know the adjoining door has to be a fire door. I hadn't picked up on the air vent so will look into that. As for gradient I was thinking more of a 2 degree at most, with a 10 degree I have visions of jet washers / compressors etc etc all rolling out every time I open the garage door Link to comment Share on other sites More sharing options...
PeterW Posted December 27, 2016 Share Posted December 27, 2016 2 degrees is fine - just watch where you put your door and threshold drain as it needs to be aligned or you can get rain running down the front of the door and under the edge. Link to comment Share on other sites More sharing options...
Temp Posted December 27, 2016 Share Posted December 27, 2016 +1 5.4 , 5.5 and diagram 10 don't actually mention the required slope. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/485420/BR_PDF_AD_B1_2013.pdf 1:40 is usually the minimum recommended for draining water off a pavement and that's 1.4 degrees. Link to comment Share on other sites More sharing options...
RichS Posted December 27, 2016 Author Share Posted December 27, 2016 (edited) Thanks for the input. Just done a bit of working out and even it I only put approx 0.6 degree fall onto a floor slab of 8.7m it will still be a differential of 87mm. I may as well just go with the 100mm step and a level floor. Does anyone know where the air vent to garage gets a mention in building regs, English version?? Edit Thinking about it a bit more. The build will be in ICF with a render finish and so I don't want to put in an air grate. If I was to put in an extract from the MVHR unit surely that would satisfy building regs. Edited December 27, 2016 by RichS Link to comment Share on other sites More sharing options...
Vijay Posted December 27, 2016 Share Posted December 27, 2016 Rich, I'm in the exact same position, building in ICF and don't really want a vent in my garage/workshop Link to comment Share on other sites More sharing options...
Guest Alphonsox Posted December 27, 2016 Share Posted December 27, 2016 2 hours ago, RichS said: If I was to put in an extract from the MVHR unit surely that would satisfy building regs. That would potentially pull fuel vapour into the house which doesn't sound like a good idea. I doubt building control would go with this as a solution - you are trying to isolate the garage from the rest of the building. How about a vent in the garage door if you need one ? Link to comment Share on other sites More sharing options...
Steptoe Posted December 27, 2016 Share Posted December 27, 2016 21 minutes ago, Alphonsox said: That would potentially pull fuel vapour into the house which doesn't sound like a good idea. I doubt building control would go with this as a solution - you are trying to isolate the garage from the rest of the building. How about a vent in the garage door if you need one ? would totally agree with that, I'd be fairly sure the vent has to be low level, the idea is to vent noxious fumes, (which are heavier than air), out, Link to comment Share on other sites More sharing options...
RichS Posted December 27, 2016 Author Share Posted December 27, 2016 (edited) Ok, can see your point on this. So does anyone know where this air vent is mentioned in the regs please?? Presumably somewhere in Part F. Edited December 27, 2016 by RichS Link to comment Share on other sites More sharing options...
ProDave Posted December 27, 2016 Share Posted December 27, 2016 Scottish regs says in a garage large enough to need vents, it needs two at low level and two at high level. Link to comment Share on other sites More sharing options...
RichS Posted December 27, 2016 Author Share Posted December 27, 2016 16 minutes ago, ProDave said: Scottish regs says in a garage large enough to need vents, it needs two at low level and two at high level. At what size??? I've just been through Part F and can't find any mention of garage ventilation in the English regs Link to comment Share on other sites More sharing options...
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