Sealing ducts for Air Tightness

[Triassic]

I need to get a post completion air tighness test done to keep BC happy. I’ve listed all my openings to the outside, such as waste pipes, drains and ducts.

 

How do you seal a duct with a group of cables in it? I was thinking of expanding foam, but how easy is it to remove, if I need to add cables etc?

[Nickfromwales]

https://www.toolden.co.uk/sealants-adhesives/expanding-foam/illbruck-fm330-pro-foam-air-seal/?gclid=CjwKCAjwwL6aBhBlEiwADycBIKWh4ubIGY3fLagkvxIwGvtNY7ewq8l_B-raIo9dzrYYVfYbgKUAlRoCKoEQAvD_BwE

 

You don't need to use much to get an airtight seal, but I always squirt some in between the individual cables to get a good spread of foam and all surfaces 'coated'.

 

If there's room, slide a redundant piece of 20mm flexible conduit in amongst the cables, foaming / taping the end of that., leaving about 200mm of conduit hanging out so you can grab it and pull it out. Get you test done, and then just pull the redundant conduit out and plug the hole it leaves with more foam, or insert more cables into the hole it leaves in the original squirt of foam, and add more foam as required / necessary.  

[Triassic]

2 hours ago, Nickfromwales said:

https://www.toolden.co.uk/sealants-adhesives/expanding-foam/illbruck-fm330-pro-foam-air-seal/?gclid=CjwKCAjwwL6aBhBlEiwADycBIKWh4ubIGY3fLagkvxIwGvtNY7ewq8l_B-raIo9dzrYYVfYbgKUAlRoCKoEQAvD_BwE

 

So my bog standard squirty foam wont do?

[Nickfromwales]

32 minutes ago, Triassic said:

 

So my bog standard squirty foam wont do?

If you ask @Russell griffiths he’ll say yes. 
The Illbruck is closed cell and rated for air tightness ( as much as any foam can be vs tape / liquid membrane ) and goes off almost like chewing gum vs the easily friable regular ( open cell ) foams. 
You can yank at the Illbruck foam and it won’t tear / break off, but regular foam is like honeycomb and very poor in comparison. 

[Russell griffiths]

10 minutes ago, Nickfromwales said:

If you ask @Russell griffiths he’ll say yes. 
The Illbruck is closed cell and rated for air tightness ( as much as any foam can be vs tape / liquid membrane ) and goes off almost like chewing gum vs the easily friable regular ( open cell ) foams. 
You can yank at the Illbruck foam and it won’t tear / break off, but regular foam is like honeycomb and very poor in comparison. 

Leave it out fatso. 

[Nickfromwales]

4 hours ago, Russell griffiths said:

Leave it out fatso. 

✌️ 🤠 

[TonyT]

Or if you are feeling flush

use a rise kit!