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PostPosted: Sat Jun 24, 2017 7:13 pm 
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Hello.

A support and floorboards downstairs are rotten. I have removed them and will replace soon.

I've left a gap for it to dry out.

This is where the dining room becomes the utility room.

The issue is there is no ventilation.

There used to be a vent - this was cemented up because the previous owner "knew better".

I have removed the cement but air only now goes into the cavity of the wall (better than nothing I guess) - there is no gap in the inner brick layer for air to enter.

I have laminate flooring so taking that up and the floorboards to take out a brink or two isn't going to happen.

Any other options?

So far:

1) Holesaw or similar a hole in my laminate floor, penetrating the floorboards and fitting a vent. However, hitting a rafter or cable is likely.

2) Fit a vent where the current gap is (this seems the easiest although not ideal).

Many thanks.


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PostPosted: Sat Jun 24, 2017 7:42 pm 
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I imagine the air brick you're referring to is a cavity vent for pre-insulation days. There is probably a corresponding airbrick at about soffit level. If cavity insulation put in retrospectively then they will have cemented or silicon sealed them up so the insulation doesn't come out.
There should be other air bricks (double sized) that go all the way through to vent the subfloor. Can't quite picture what you mean about taking up laminate floor as it sounds like you have the affected area already lifted? I'd say drill a few bricks out and install some airbricks. Do usual check soil isn't heaped over existing airbricks outside. Check rubble and soil aren't touching timbers in the subfloor. Check any honeycomb brick structures are free of debris to allow air flow.

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PostPosted: Sat Jun 24, 2017 7:43 pm 
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Your first action is go back to the vent which was 'cemented' up and look at removing a brick from the inner brick wall across the cavity. This should be easily achieved by hand using a suitable long cold chisel and a lump hammer. A suitable chisel would be about 450mm long or longer.
Remove the inner brick completely and fit a clay or plastic cavity sleeve which will bridge the cavity between the holes.
Then fit an air brick in the external hole.
You then need to check that other Vent holes have not been closed off too.
Just so you are aware, the void under the floor has to have cross ventilation in order for the floor timbering to remain sound.
If other vents have been closed, you need to address those too in the manor described above.

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PostPosted: Sat Jun 24, 2017 11:20 pm 
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can you go under the suspended floor?
knocking out bricks for air bricks you need to open up right throug the wall.
dont drill holes throgh the laminate.do you have a picture where the floor is open


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PostPosted: Mon Jun 26, 2017 7:35 pm 
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portera86 wrote:
If cavity insulation put in retrospectively then they will have cemented or silicon sealed them up so the insulation doesn't come out.

There should be other air bricks (double sized) that go all the way through to vent the subfloor. Can't quite picture what you mean about taking up laminate floor as it sounds like you have the affected area already lifted? I'd say drill a few bricks out and install some airbricks. Do usual check soil isn't heaped over existing airbricks outside. Check rubble and soil aren't touching timbers in the subfloor. Check any honeycomb brick structures are free of debris to allow air flow.



No cavity insulation has been put in.

I have three other vents ground-floor level. These are fine and not blocked.

Re/ the area already being lifted - I can lift a small portion of floor in the Utility Room (which is lino) and I have indeed done this.

Then, we are onto the laminate floor.

davyp1 wrote:
Your first action is go back to the vent which was 'cemented' up and look at removing a brick from the inner brick wall across the cavity.

davyp1


This is the issue - gaining access to the inner bricks.

wes56 wrote:
can you go under the suspended floor?
knocking out bricks for air bricks you need to open up right throug the wall.
dont drill holes throgh the laminate.do you have a picture where the floor is open


I will get a picture together soon.


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PostPosted: Mon Jun 26, 2017 7:38 pm 
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Also, to add more context, my air bricks are staggered.

Like this:

Image


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PostPosted: Tue Jun 27, 2017 3:55 pm 
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davyp1 wrote:
Your first action is go back to the vent which was 'cemented' up and look at removing a brick from the inner brick wall across the cavity.

davyp1


This is the issue - gaining access to the inner bricks.



I will get a picture together soon.[/quote]

I do not see what your problem is in taking an inner brick out in each case!
If necessary two/three or more bricks would be removed from the external leaf of brickwork just to access the inner leaf.
Once a brick was removed to the inner wall a clay cavity sleeve would be cut to the right length and both walls repaired and an air-brick fitted to the outer leaf at the same time.
I assure you, it's not rocket science. Also, I doubt it would be necessary to remove more than a couple of external bricks in order to gain access to remove the inner brick.

This work needs doing in order to provide cross ventilation as mentioned earlier.

davyp1


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PostPosted: Tue Jun 27, 2017 5:13 pm 
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otronics wrote:
Also, to add more context, my air bricks are staggered.

Like this:

Image


Perhaps ignore my earlier reply!
Your sketch is indicative of "a telescopic" vent.
If this is the case and only the Air-brick has been cemented up, can you not just clear the cement or replace the air-brick?

davyp1


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PostPosted: Tue Jun 27, 2017 10:41 pm 
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davyp1 wrote:
otronics wrote:
Also, to add more context, my air bricks are staggered.

Like this:

Image


Perhaps ignore my earlier reply!
Your sketch is indicative of "a telescopic" vent.
If this is the case and only the Air-brick has been cemented up, can you not just clear the cement or replace the air-brick?

davyp1


Correct - a telescopic vent.

I have removed all the cement from the outer air brick - no issues there.

My problem is that the inner section was bricked up and I have no access to it.


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PostPosted: Tue Jun 27, 2017 11:33 pm 
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otronics wrote:
davyp1 wrote:
otronics wrote:
Also, to add more context, my air bricks are staggered.

Like this:

Image


Perhaps ignore my earlier reply!
Your sketch is indicative of "a telescopic" vent.
If this is the case and only the Air-brick has been cemented up, can you not just clear the cement or replace the air-brick?

davyp1


Correct - a telescopic vent.

I have removed all the cement from the outer air brick - no issues there.

My problem is that the inner section was bricked up and I have no access to it.


Make an access then by removing a couple of bricks lower down!
Remove mortar around the bricks with a 'plugging chisel' and lump hammer. Keep at it steadily and you would have two bricks out in 15 minutes or so. Then address the removal of the bricked up inner hole!
You may damage the telescopic vent and have to replace it.

davyp1


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PostPosted: Wed Jun 28, 2017 10:55 am 
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davyp1 wrote:

Make an access then by removing a couple of bricks lower down!
Remove mortar around the bricks with a 'plugging chisel' and lump hammer. Keep at it steadily and you would have two bricks out in 15 minutes or so. Then address the removal of the bricked up inner hole!
You may damage the telescopic vent and have to replace it.

davyp1


I think you are right and that this is the way forward.

I have some rendering to contend with too and I need to double-check heights but this should be OK.

Thanks.


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PostPosted: Wed Jun 28, 2017 11:12 am 
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otronics wrote:
davyp1 wrote:

Make an access then by removing a couple of bricks lower down!
Remove mortar around the bricks with a 'plugging chisel' and lump hammer. Keep at it steadily and you would have two bricks out in 15 minutes or so. Then address the removal of the bricked up inner hole!
You may damage the telescopic vent and have to replace it.

davyp1


I think you are right and that this is the way forward.

I have some rendering to contend with too and I need to double-check heights but this should be OK.

Thanks.


You mention rendering!
You need to check the level of your DPC and that no one has rendered over it!
Please check and come back.

davyp1


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PostPosted: Wed Jun 28, 2017 11:53 am 
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Quote:

You mention rendering!
You need to check the level of your DPC and that no one has rendered over it!
Please check and come back.

davyp1


Very good point.

I shall have a look later and put up some photos.


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PostPosted: Wed Jun 28, 2017 3:29 pm 
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otronics wrote:
Quote:

You mention rendering!
You need to check the level of your DPC and that no one has rendered over it!
Please check and come back.

davyp1


Very good point.

I shall have a look later and put up some photos.


Ok

davyp1


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PostPosted: Thu Jun 29, 2017 12:11 pm 
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Images.


Attachments:
File comment: For reference - the other side of the blocked vent, where the laminate is fitted.
Inside.JPG
Inside.JPG [ 610.9 KiB | Viewed 418 times ]
File comment: The unblocked vent. The rendering is from the ground to the window ledge (you can see where it stops behind the chairs).
Outside.JPG
Outside.JPG [ 710.28 KiB | Viewed 418 times ]
File comment: Rotten rafter and floorboards removed. It has left this gap. I will cut wood, treat and fit. This is where the dining room becomes the utility room. (The rot/damp has damaged some of the door frame too so I will need to repair that).
Gap.JPG
Gap.JPG [ 659.76 KiB | Viewed 418 times ]
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