Vijay Posted December 2, 2016 Share Posted December 2, 2016 Afternoon, My TA has drawn telescopic air vents in my garage slab. I've asked him if this is correct but can't get a reply. So for the life of me I can't understand why they're there and what they're venting? Link to comment Share on other sites More sharing options...
Guest Alphonsox Posted December 2, 2016 Share Posted December 2, 2016 Interesting - What's the floor structure? Link to comment Share on other sites More sharing options...
Brickie Posted December 2, 2016 Share Posted December 2, 2016 Don't know much about CAD but I'd guess he's copy & pasted from a beam & block floor detail & altered it to show your solid floor. No reason I know of to have it in your design. Link to comment Share on other sites More sharing options...
Vijay Posted December 2, 2016 Author Share Posted December 2, 2016 3 hours ago, Alphonsox said: Interesting - What's the floor structure? According to the drawings from the TA and SE, the base layer is 50mm blinding on top of 150mm type1 - so can't see why that would need to be vented................ Link to comment Share on other sites More sharing options...
Vijay Posted December 2, 2016 Author Share Posted December 2, 2016 21 minutes ago, Brickie said: Don't know much about CAD but I'd guess he's copy & pasted from a beam & block floor detail & altered it to show your solid floor. No reason I know of to have it in your design. That makes more sense and probably the case. Such a shame in weeks he can't answer it though Unless anyone can think of a reason, I will take it as a mistake but which with BC too Link to comment Share on other sites More sharing options...
Oz07 Posted December 2, 2016 Share Posted December 2, 2016 Any builder worth his salt will come to same conclusion as brickie. Exclude. Unessecary. Link to comment Share on other sites More sharing options...
Vijay Posted December 2, 2016 Author Share Posted December 2, 2016 It's more for me to know exactly what's going on and if something is on the drawings, understanding why Link to comment Share on other sites More sharing options...
Temp Posted December 2, 2016 Share Posted December 2, 2016 If there is no void it doesn't need venting. Link to comment Share on other sites More sharing options...
Vijay Posted December 3, 2016 Author Share Posted December 3, 2016 Cheers guys, exactly what I thought and hoped you'd all say Link to comment Share on other sites More sharing options...
joe90 Posted December 3, 2016 Share Posted December 3, 2016 My architect made similar errors on my plans, obviously cut and pasted from "generic" plans. As he can't be bothered to reply perhaps you should be equally late in paying him ? Link to comment Share on other sites More sharing options...
MrP Posted December 3, 2016 Share Posted December 3, 2016 I think that is a radon sump and will definately need venting. You need to check what will form the void (i would assume a large diameter granular material) as the slab is ground bearing. Is the garage attached to the house or detached? Link to comment Share on other sites More sharing options...
Vijay Posted December 3, 2016 Author Share Posted December 3, 2016 Garage is attached. I don't believe I need a radon sump as the other plots didn't Link to comment Share on other sites More sharing options...
MrP Posted December 3, 2016 Share Posted December 3, 2016 I would check that as a radon barrier is indicated on this drawing and the one on the other thread with your ICF to foundation detail. Sometimes radon can be extremely localised, i have developments of 100+ houses where perhaps only 1 or 2 require radon protection. Requirement for this will normally be confirmed in your site investigation/soil sampling report. Link to comment Share on other sites More sharing options...
Vijay Posted December 3, 2016 Author Share Posted December 3, 2016 I know I need a radon barrier but the reason I agree it's a mistake on the TA's behalf is because in the description he states the radon barrier is on top of sand blinded compacted hardcore Link to comment Share on other sites More sharing options...
MrP Posted December 3, 2016 Share Posted December 3, 2016 Which is exactly where it should be but because the floor is ground bearing and has no sub floor void then you need to create one in the form of a sump which can then be vented to avoid a dangerous build up of gas in the floor below. To me the drawing looks absolutely correct however as mentioned before you just need to check exactly how and out of what the sump is to be formed. Link to comment Share on other sites More sharing options...
joe90 Posted December 3, 2016 Share Posted December 3, 2016 Interesting, I had a radon barrier in the new build house but told the garage didn't require one because it was not sealed like a house! Link to comment Share on other sites More sharing options...
Vijay Posted December 4, 2016 Author Share Posted December 4, 2016 14 hours ago, MrP said: Which is exactly where it should be but because the floor is ground bearing and has no sub floor void then you need to create one in the form of a sump which can then be vented to avoid a dangerous build up of gas in the floor below. To me the drawing looks absolutely correct however as mentioned before you just need to check exactly how and out of what the sump is to be formed. Would that be from BC? Link to comment Share on other sites More sharing options...
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