ducting through a new slab for existing air bricks

[richardindorset]

I'm laying a slab which butts up against two walls of our house. The existing walls form an internal corner and the new slab extends out from there.

There are 4 air bricks in the original external walls so these need ducting through the slab to retain ventilation.

Three of the existing air bricks are all in a wall less than 3 meters long and one is in the adjoining wall.

Should I run 4 independent ducts out so they end up evenly spaced across the new wall or bunch them up?

I assume that to maintain air flow, using 110mm soil pipe for the duct, I cannot manifold the air bricks into pairs down single ducts?

In the diagram, the red area is the slab. There are bifolds at one end opening onto a patio and french doors on the long wall.

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• richardindorset
• 15 Feb 2015
• 1

Untitled

• richardindorset
• 15 Feb 2015
• 1

Untitled

• richardindorset
• 15 Feb 2015
• 1

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[freddiemercurystwin]

I would do this:

whatever

• freddiemercurystwin
• 15 Feb 2015
• 1

You may aswell extend all four, the cost of a few pipes and airbricks won't break the bank and maximising airflow is good.

But no doubt others may have other ideas!

You may find this thread useful //www.diynot.com/forums/viewtopic.php?t=171482 or maybe you found it already.