BartW Posted May 11, 2022 Share Posted May 11, 2022 Good morning, We are currently at the point of building a foundation for our next house, and have come to a stumbling point. We previously had an external brick skin to the plinth which was providing a route, and a way of dressing the telescopic vents. We later removed that external skin, as concluded it was costing a lot of money, by not doing anything structural (our timber frame sits fully on top of the 140mm 7kN blocks). This leaves us with a question of how to address the ventilated void. Telescopic vents will have nowhere to be hidden externally, and there will be no way / point to install the vent grilles. How has everyone else been addressing this? One of the neighbours is proposing bollard vent system on theirs, but I find this would be in the way of all things around the property. Any ideas please? Thanks Bart Link to comment Share on other sites More sharing options...
George Posted May 11, 2022 Share Posted May 11, 2022 It is better to keep the outer leaf up to floor level, this gives the cladding something to meet up with that won't rot and gives the telescopic vent somewhere to sit. 2 Link to comment Share on other sites More sharing options...
ETC Posted May 11, 2022 Share Posted May 11, 2022 (edited) 10 hours ago, BartW said: Good morning, We are currently at the point of building a foundation for our next house, and have come to a stumbling point. We previously had an external brick skin to the plinth which was providing a route, and a way of dressing the telescopic vents. We later removed that external skin, as concluded it was costing a lot of money, by not doing anything structural (our timber frame sits fully on top of the 140mm 7kN blocks). This leaves us with a question of how to address the ventilated void. Telescopic vents will have nowhere to be hidden externally, and there will be no way / point to install the vent grilles. How has everyone else been addressing this? One of the neighbours is proposing bollard vent system on theirs, but I find this would be in the way of all things around the property. Any ideas please? Thanks Bart Get rid of the ventilated void and use precast concrete slabs rather than block and beam. Edited May 11, 2022 by ETC Additional information included Link to comment Share on other sites More sharing options...
BartW Posted May 11, 2022 Author Share Posted May 11, 2022 4 hours ago, ETC said: Get rid of the ventilated void and use precast concrete slabs rather than block and beam. Too late for this. We are where we are. Any other options that work with BB? Link to comment Share on other sites More sharing options...
Nickfromwales Posted May 12, 2022 Share Posted May 12, 2022 8 hours ago, BartW said: Too late for this. We are where we are. Any other options that work with BB? So what is your rain screen going to be then? Link to comment Share on other sites More sharing options...
BartW Posted May 12, 2022 Author Share Posted May 12, 2022 We are proposing vertical + cross battens, then open charred timber facade. by the way, when browsing I found this last night. I think I will run it passed BC: Link to comment Share on other sites More sharing options...
ETC Posted May 12, 2022 Share Posted May 12, 2022 Looks like a very clever detail. You might need drainage in the floor void. Get rid of the void by infilling the height difference between the infill block and the beams with insulation. Fill the sub-floor with hardcore, lay a bed of sand, lay a sacrificial DPM, lay the beams, infill the base with insulation and lay the blocks. Would this work? Link to comment Share on other sites More sharing options...
Faz Posted May 12, 2022 Share Posted May 12, 2022 I don't see how that vent works as it is below ground level and will have no airflow.... Link to comment Share on other sites More sharing options...
DragsterDriver Posted May 12, 2022 Share Posted May 12, 2022 Interested to see what building control say? Link to comment Share on other sites More sharing options...
Simplysimon Posted May 12, 2022 Share Posted May 12, 2022 with b&b floor presumably 2 x dpm due to isulation, how much water is going to come up through. i was under the impression you could lay b&b on the ground. Link to comment Share on other sites More sharing options...
Roundtuit Posted May 12, 2022 Share Posted May 12, 2022 14 hours ago, BartW said: by the way, when browsing I found this last night. I think I will run it passed BC: Great on paper, but blocked up with crap within a couple of years I reckon. Is it too late to keep the outer leaf up to dpc level as suggested by @George ? Link to comment Share on other sites More sharing options...
BartW Posted May 13, 2022 Author Share Posted May 13, 2022 8 hours ago, Roundtuit said: Great on paper, but blocked up with crap within a couple of years I reckon. Is it too late to keep the outer leaf up to dpc level as suggested by @George ? It's not, but I find paying extra £6k for that a privilege I can spend money on elsewhere (like "overnight" steel price increases that amounted to that and a bit...) Link to comment Share on other sites More sharing options...
Tom84 Posted May 23 Share Posted May 23 What did you do in the end? I'm currently looking at the same issue. Also, how to protect the end of beams from moisture? Link to comment Share on other sites More sharing options...
BartW Posted May 29 Author Share Posted May 29 On 23/05/2024 at 19:56, Tom84 said: What did you do in the end? I'm currently looking at the same issue. Also, how to protect the end of beams from moisture? So I extended the vertical sleeves up and cut them into the charred timber cladding, then bought metal decorative grilles that have got a fine mesh and pretty much do not obstruct airflow vs designed air brick flow. Patio level is up as well, so it looks really clean. Link to comment Share on other sites More sharing options...
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