New conservatory wall

thomo5949 · 15 Oct 2013

I'm have a new conservatory built by a builder / conservatory company. They've done the foundations, sub walls and slab. They're building the superstructure and all the doc / Dom has gone in.

The first course of external block above the slab have small air vents between the cavity and the outside. However the external ground level will be about 100 - 150mm a over the slab so the vents will be below ground level.

Is this right?
How might the builders ensure they work?
Are the vents to allow air in or moisture out? (Walls will have foil backed insulation in the cavity)

noseall · 16 Oct 2013

thomo5949 said:
and all the doc / Dom has gone in.

What does this mean?

thomo5949 said:
The first course of external block above the slab have small air vents between the cavity and the outside. However the external ground level will be about 100 - 150mm a over the slab so the vents will be below ground level.

Is this right?
How might the builders ensure they work?
Are the vents to allow air in or moisture out? (Walls will have foil backed insulation in the cavity)

I'm guessing that you have existing suspended timber floors in the room that the connie abuts yes/no?

Alastairreid · 16 Oct 2013

DPC/DPM?

vents below finished ground level is wrong!

I'm assuming this is an insulated floor slab so confused what the vents are for.

post a pic.

freddiemercurystwin · 16 Oct 2013

I assumed the vents were in the existing for the existing suspended floor. But then I've just re-read it so maybe not? The OP needs to clarify though if its a conservatory company its probably up by now, all nasties hidden away until they re-surface in a few years!

TonyW2 · 16 Oct 2013

Are they vents or gaps for drain for any water entering cavity???

ban-all-sheds · 16 Oct 2013

If they are below ground they're to let water into the cavity.

Alastairreid · 16 Oct 2013

ban-all-sheds said:
If they are below ground they're to let water into the cavity.

Never heard of that one before.

thomo5949 · 16 Oct 2013

Firstly thanks for the response

I was meant to say DPC / DMP in my original post.

The conservatory is coming off a newly built house that is timber framed and has a beam and block ground floor that is adequately vented around he entire house.

The conservatory has a concrete slab cast inside the new strip foundations and block sub structure. The slab will then have 100mm of insulation and 50mm screed with a wet under floor floor heating system.

The vents I'm referring to are in the first later of block above the slab and they are about 50mm in height and 10mm wide placed in the vertical mortar joints about ever 4 blocks. These will eventually be under the external grind level when the back fill is completed.

Alastairreid · 16 Oct 2013

They are called weep vents and you cant cover them up.

tony1851 · 17 Oct 2013

Just one pic. would have avoided all this confusion.

noseall · 17 Oct 2013

Why are there weep vents there in the first place?

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New conservatory wall

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