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 Post subject: under floor ventilation
PostPosted: Tue Oct 17, 2017 11:49 am 
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Hi All

I have a question regarding venting the underfloor. Thanks in advance for your time.

Here's an overview with my question at the end.


My house is a 1940's brick/cavity constructed semi without cavity insulation. Suspended wooden floor apart from solid kitchen at rear.

My question concerns the lower air bricks which sit on the DPC as viewed from outside and ventilate the cavity and underfloor via a missing brick internally.

There are 3 vents at the front, 2 gable end & 3 at the rear.

Only 2 (of 3) vents at the rear serve the underfloor as the kitchen has a solid floor.

External vents are 2 bricks above the internal vent, which is simply a missing brick bridged with slate.

When I'm under the floor I can see daylight through the gable & rear vents.

However the 3 vents at the front are just ventilating the cavity as the builder appears to have roughly mortered a brick on edge in the internal vent hole.




Getting back to it...

I'm unsure if the front internal vents (gaps) were bricked intentionally to create a specific airflow direction or to stop it being too draughty.

Admittedly I'm not having rot problems but I am doing repairs internally so thought I'd ask. I will also be having patio doors fitted so may loose a vent at the rear due to a step.


Can I remove one, or all 3 bricks, set on edge (internally under floor) at the front of the house and insert plastic airbricks to increase airflow?


Your views are appreciated...Thanks for your input :)


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PostPosted: Tue Oct 17, 2017 6:41 pm 
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Yes, fit air bricks.



For this message the author cotswold builders has received gratitude : ran1
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PostPosted: Tue Oct 17, 2017 10:01 pm 
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cotswold builders wrote:
Yes, fit air bricks.


Thanks. Would the plastic vents be ok. They give better flow and are inexpensive. Was concerned about their strength when compared to clay. :dunno:


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PostPosted: Thu Oct 19, 2017 6:29 pm 
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Plastic vents are okay



For this message the author cotswold builders has received gratitude : wine~o
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