Changing door which leads into garage

[freddiemercurystwin]

Should be 8-10mm.

 

[shabbaranks]

A fire door frame should have a groove into which the intumescent strip should be fitted. This swells when it gets hot and fills the gap. You can optionally buy them with a brush included, which provides draughtproofing while the place isn't on fire.

See attached photo of mine.

If you haven't got a strip then it's not a fire door. It also needs a spring to close it.

I don't know what the regs are for the bottom of the door. As mine didn't actually require a fire door, I only wanted it for soundproofing, I didn't bother looking into it.

View attachment 348540

Does it matter which side the strip is on (garage or room)? I'm guessing from a cosmetic perspective garage side is better?

Also I've taken out the old door ready to fit the lining. I noticed that there is a bit of a gap either above or below depending on how I fit the lining. My thought was fit it all the way to the top bar 5mm which I can pack out (same either side). Then once fitted pack and screw then fill with fireproof expanding foam then tidy. After that at the bottom fit a threshold to the remaining space left which would bring it to the bottom of the jambs screw in and jobs a gooden then on to the door.

 

[23vc]

The strip needs to be in the mid point of the door thickness when closed. It swells up when hot and seals against the door

 

[Ivor Windybottom]

Yep, strip goes on the hinge side. Otherwise it's useless!

 

[shabbaranks]

Cool. Will attack this tomorrow bought a length of wood to cut up and make some packers. Would I be wise to go down the fireproof expanding foam route once it's all packed and in situ?

 

[23vc]

That’s what I did, yeah

 

[Ivor Windybottom]

Don't stuff with cement or anything water-based as I once did with a door frame years ago. The water against the bare wood made the back of the door frame expand, the whole thing dished as it expanded.

 

[shabbaranks]

So this is where I'm at so far. As you can see there is about a 20mm gap on the wall side which is the side that will hold the door. If I run a level up either side it's level at a 76.3mm gap running through. See square is pretty good so is there anything I'm missing before I pack and screw it? This is my first attempt at installing a door lining but it was a real pain.