Fire Door

[fattony]

Hi

I have a fire door fitted between an attached garage and utility room, it’s plastered on the utility room side but not the garage and I suspect building control will want something in the gaps.

Any idea what I can use, hinge side there is room for fire board but it’s only 50mm, there’s a 25mm gap between the door lining and the lintel and a 15mm gap on the opening side.

Thanks

 

[Deleted member 174758]

If the gap is more than 5mm you are supposed to pack it with mineral wool to within 10mm of the surface then fill the last 10mm with intumescent caulk (a messy job). Fire foam is nowadays regarded as suspect because it can deteriorate over time and lose its' fire retardant properties. The gap between the door and tbe frame should be 2 to 4mm at the be top and sides and not more than 4mm at the bottom (current regs)

But is that actually a solid or semi-solid fire door? With intumescent strips in the frame and a door closer fitted?

 

[fattony]

Thanks, it doesn’t have a closer, building control may request it does.

I was wondering about fire foam but wasn’t sure if it would be accepted.

I’ll have a look at the mineral wool route first.

Thanks

 

[Deleted member 174758]

I was wondering about fire foam but wasn’t sure if it would be accepted.

On bigger jobs where it is generally not permitted these days. The BCO may or may not permit it, but either way mineral wool was the traditional approach - the main change in recent years has been the move to having intumescent caulk as well. In the event of a fire this swells to block any gaps anf slows the spread of the fire

 

[gonch69]

As said above the only foam alternative is blue 60
But it can't be used in gap below 10mm

Blue 60 Fire Rated Frame Foam 750ml - Fire Seals Direct

Blue 60 is a specially formulated expanding foam that can provide up to 60 minutes fire protection to timber doorsets. Shop Online Now!

www.firesealsdirect.co.uk

 

[Wayners]

I'd fill with wood strips stuck with polymer grab. Buy off rack at diy then fill gap with incandescent mastic.

You need 3 hinges on that door

 

[bernardgreen]

incandescent mastic.

?

 

[Deleted member 174758]

I think he meant intumescent - the thought of a fire door actually being a fire door and perhaps spontaniosly combusting leaves me somewhat perplexed.

 

[JohnD]

On bigger jobs where it is generally not permitted these days. The BCO may or may not permit it, but either way mineral wool was the traditional approach - the main change in recent years has been the move to having intumescent caulk as well. In the event of a fire this swells to block any gaps anf slows the spread of the fire

This kind of thing?

I had some for pipes going through the garage ceiling. Also a sort of cushion to pack into the duct

 

[^woody^]

Fire foam (Blue 60 comes to mind) and architrave. BCO's do not inspect gaps around doors behind architraves.

 

[JohnD]

I used pink fire foam round mine. I suppose I could add caulk.