Air vents under doors / level thresholds

[Vijay]

Just wondered if there was a way of having an air vent (telescopic in my case) with a level door threshold?

[PeterW]

Picture please ......

 

do you mean instead of a brick under the cill there is a vent...?? I’d say no, as the ramp / access will obscure it but losing a single vent is nothing. 

[Mr Punter]

No I have recently done a development with lots of external doors, full length windows and windposts and the number of place we could put vents was very limited.

[Vijay]

Building in ICF but yeah the vent would be under the sill.

 

What happens if I want a raised patio area at the back of the house, that would mean having to get rid of a few

[Mr Punter]

And I assume there are bifolds running the length?  If so, there is not much you can do.  Put lots wherever else and make sure there is lots of ventilation through any cross walls.

 

Oh and I don't know what system you are using but @Russell griffiths had some real issues on an ICF with the concrete squashing the telescopic vents.

Edited November 9, 2018 by Mr Punter
Cos I noticed it was ICF

[Russell griffiths]

Hi @Vijay I thought you were past this point, I did indeed have a very major cock up with our telescopic vents

the weight of the concrete and the vibrations collapsed the telescope sections, and I had to cut them all out by hand after the concrete had gone off. 

If you haven’t done this yet I would look at reinforcement over the vent to give it more strength. 

Hows it all going mate. 

Russ. 

[Vijay]

28 minutes ago, Mr Punter said:

And I assume there are bifolds running the length?  If so, there is not much you can do.  Put lots wherever else and make sure there is lots of ventilation through any cross walls.

 

Oh and I don't know what system you are using but @Russell griffiths had some real issues on an ICF with the concrete squashing the telescopic vents.

 

Doubt I'll be having bi-folds cos of the related issues, probably a slider and a french door.

 

Yeah I saw Russell's post but just have to hope I don't get the same issue

[Vijay]

22 minutes ago, Russell griffiths said:

Hi @Vijay I thought you were past this point, I did indeed have a very major cock up with our telescopic vents

the weight of the concrete and the vibrations collapsed the telescope sections, and I had to cut them all out by hand after the concrete had gone off. 

If you haven’t done this yet I would look at reinforcement over the vent to give it more strength. 

Hows it all going mate. 

Russ. 

 

Was it a case of too much concrete at once? The only reason I ask that is Polarwall and a pump guy I was chatting to, both said that you don't pump in one place, you keep going round and round and layer the concrete. That gives the concrete time to start going off and also why the mix has to be so specific.

 

All the air vents are in (have been for a couple of months) but I'm doing doorways at the moment hence this post.

 

How's it going...........................don't ask!!! lol  I'm jealous that you've already done a pour!! lol

[Russell griffiths]

First pour was only 450mm high. 

It seems the vents that collapsed where the telescopic sections, as one piece slots inside another you get an overlap, it was this overlap that allowed concrete slurry to push up from the bottom and enter the hollow tube, 

if i wa doing it again I would get some thin xps sheet and clad the vents to seal them up and add extra strength. 

This is what I was up to today. 

[Jeremy Harris]

I'm at a loss to understand why so many vents are really needed under a beam and block floor.  I've heard tales that it's to allow gas to escape, but having had to rip up the concrete floor of an old Cornish cottage nearly 30 years ago, and fit a radon sump and vent, I really cant see why more than a single vent is needed, maybe two at the most.  Our radon vent was a 110mm soil pipe coming out the side of the house from the sump and running up the outside of the house, and that was deemed to provide adequate ventilation.  Similarly, covered refuse tips will just have a few pipes around the same size poking up as gas release vents.

[Russell griffiths]

My architect stated air vents under the doors, I explained to bc that this couldn’t be done because of level access, but I had increased the number of vents on the two opposing sides to get a good cross ventilation, he was happy with this and it has not been mentioned since. 

[MortarThePoint]

Not sure what the correct forum protocol is here (new thread or use old one) but I am facing a similar issue. Is it not possible to have the vent sunk down in a box with a horizontal grate over the top as long as the box can drain? Obviously it would be a problem if the drain pipe blocked and the top was open to rain. We are working out how to get vents in to our porch whilst having level access. The porch has a roof.

 

I'd like to keep the ability to have a level patio at the back too don the line. There are lots of vents along that elevation so...

 

There'd be mesh under the brass vent plate shown screwed over the box.

 

 

Edited May 21, 2020 by MortarThePoint