Fire doors, are they needed.

Hi, You right in that no intumescent, is not really a fire door. Regardless of the blank make up or glass etc. Without the intumescent, there can be no fire seal to the frame in the event of a fire. With regards to Building Regulations, its worth checking with them, but as you say and as I understand it domestic properties with 3 storeys or more are required to have fire doors to communal areas or rooms leading to a stair well. The moving of the stops to make a 35mm door work is fine, you just will need to adjust all the ironmongery to make the door work. Are you replacing doors for a reason other than decoration. You may find it simpler to keep to a 44mm door non fire door, less destruction and fiddling with keep, lock alignment. Hope that helps

Fire are needed in a house of multiple occupancy and rented accommodations. That being said its always going to be safer to have fire doors . but you will need to instal fire regulated door linings to with intumescent strips.

Just note that fire doors require a label stamp etc stating their fire resistance plus possible need for door closers .Advise customers on fire zones and escape plans via the fire brigade advisor.

Hi, I would suggest that if the door has 15 panes of glass, that they are actually not fire doors, but external doors being used internally. External doors are usually 44mm thick. With 15 panes of glass, the wood between the glass would not be large enough to pass fire regs. The wood would burn and the glass would fall out. I believe on a fire door the wood between glass has to be something like 115mm. But don't quote me on that as I am going from memory.