Fire Stop Locations for Timber frame with external cladding

[HanleeHouse]

Hi All, 

 

I'm about to start the external of my timber frame build which is a mix of Stone and render. Stone sections on 38mm battens, and render on 38mm cross battens. All then covered in 12mm cement board to apply the final finish. 

 

I've been racking my brain regarding the fire stops. I'm aware that the 38mm / 76mm timber around openings is sufficient. However, it's the horizontal fire stops that I'm questioning. I've seen some have used intumescent strips top and bottom of the cavity, others one strip between floors. 

Please could I ask what you have done on your builds? Also, do I need them on the single story side sections, or just the two story?

I've attached my elevations for reference. 

Many thanks appreciate your help. 

David 

PL-003 Proposed Elevations.pdf

[Great_scot_selfbuild]

@HanleeHouse did you ever get any resolution to this (from elsewhere) I'm just about to post on the same topic and was doing my due diligence of seeing what other threads had been started - very surprised to see so few threads on this topic. I like the design btw!

[Dunc]

I ended up just putting a proposal to my BCO and asking if they were happy.

They required horizontal fire stops (intumescent strips) between floors (though couldn't specify if this should be at ceiling plasterboard level, or at upper floor level), at the eaves, and above/below windows/doors

[Great_scot_selfbuild]

9 minutes ago, Dunc said:

I ended up just putting a proposal to my BCO and asking if they were happy.

They required horizontal fire stops (intumescent strips) between floors (though couldn't specify if this should be at ceiling plasterboard level, or at upper floor level), at the eaves, and above/below windows/doors

I could write you the response I'd get from my BCO:

It's for your Principal Designer to define where it goes, I just check it's where they say it needs to be.

 

(I'm assuming this is now the common approach to all BC questions?)

[Dunc]

I just said: This is my proposal for fire stopping. Are you happy?

They said "nearly" just don't forget the eaves.

simples.

[Great_scot_selfbuild]

Just now, Dunc said:

I just said: This is my proposal for fire stopping. Are you happy?

I like it. This matches my preference for always offering a solution to a design that I can make work, rather than someone else coming to me with an unworkable one.

 

Do you have any recommendation on product? I need it to fit behind the counter battens (I have a 25mm gap)

[saveasteading]

4 hours ago, Great_scot_selfbuild said:

any recommendation on product

It doesn't have to be fancy special stuff. It is stopping fire from spreading through a cavity so even wood will usually be suitable.

[trialuser]

1 hour ago, saveasteading said:

It doesn't have to be fancy special stuff. It is stopping fire from spreading through a cavity so even wood will usually be suitable.

? Unless the cavity also needs to be ventilated?

I had to use intumescent stuff, cant remember what it was but cost a fortune.

I could use wood fo vertically aligned stops.