Neil ashdown

My thoughts. Can you demonstrate that you will be working to the relevant Standards that apply to flat entrance doors?

Possibly. Assess the existing door frame and its installation to the surrounding structure in terms of compliance with BS 8214: 2016 and the fire door leaf manufacturers requirements.

Engage a competent person to advise in terms of compliance with the 'Regulatory Reform (Fire safety) Order 2005'.

In order for a timber-based fire door to meet FD30(s) status: A) The gap at the threshold should be 3mm maximum OR B) The gap at the threshold should be 10mm max and with a flexible seal installed to seal the gap under the door, in the door-closed position. The seal must not cause the door to bind on the floor and so impede the self-closing action. Reference: BS 8214: 2016 Timber-based fire door assemblies - Code of practice. But applied in the context of the fire door being 'Nominal'.

FDIS does not claim to be a "third party accredited scheme". In my experience, as a member of a UKAS accredited third party certification scheme, it is not usual practice for the scheme to "review the reports in order to verify your results". However, it is worthwhile that Prometheus makes contact with FDIS in relation to the question about sharing the inspection data as I am sure they can help.

The fire doors should comply with BS 8214: 2016 in terms of their FD30(s) status. Door leaf to door frame gaps should be 2mm to 4mm for best performance. Smoke seals must be effective, the brush, blade or fin should close the gap but not impede the self-closing action. Threshold gap should be 3mm max or where this is not possible the gap should be 10mm max between the bottom edge of the door leaf and the floor. It may be possible to fit a flexible seal / threshold plate to close the gap in the door-closed position. The seal must not cause the door to bind on the floor and so impede the self-closing action.

Try social media. FDIS are pretty active there and may respond sooner, I am sure they can help you.

Where the gap between the door frame and the surrounding wall is too large to suit the new door-set or door assembly it is, within reason, acceptable to use a timber subframe. Clearly, it will be necessary for the subframe and door-set / door assembly to be an intimate fit with each other once installed. Given this, it would be interesting to understand why the timber subframe should not be fixed to the door frame - only to the wall! Maybe, in this particular case, the subframe is quite thick? The structural openings for replacement fire doors should be measured carefully and the door-set / assembly made to suit, so as to avoid adding timber subframes where possible.

Contact the fire door leaf / fire door-set manufacturer for advice. They will have evidence of fire resistance performance for the door and be able to advise the requirements for subframes.

Most timber-based fire doors allow bolt through pull handles under certain conditions. However, to be certain whether this applies to your door you should contact the door manufacturer for advice.

The door security viewer (spy hole) fitted to your fire door should have been a fire resistance performance tested product. Therefore, by replacing it with a camera you may have adversely affected the fire resistance performance of the door.

The inspector should be able to provide you with details of the necessary remedial works and as they have inspected the door you should contact them in the first instance. However, Georgian Wired polished plate is considered acceptable for vision panels in fire rated doors but there is more than one type. So in terms of installing a suitable glazing system you should seek advice from a fire door / fire rated glazing specialist.

That's correct. If only the decorative veneer is damaged it can be repaired.

First make sure that the door is completely solid and suitable to accept a concealed self-closer, many fire doors are not. If the door is new, you can easily find out by consulting the door manufacturer. I understand that Safelincs have a selection of concealed self-closers.

Yes it would be interesting to see what happened. It may be possible to install secondary glazing to form a fire rated panel whilst retaining the existing heritage glazing. A suitable survey by a competent person would be necessary first.

A new fire door-set is always preferable to a new fire door leaf-only in terms of suitability, compatibility and compliance. Before you order your replacement check that the inspector has checked ALL evidence of fire resistance performance for the glazed door. Some manufacturers test with more than one provider and therefore it could sometimes be possible that additional data may exist.

A double-action swing door would be unlatched and the self-closing device / floor spring should cause the door to close in the correct position. If its a fire door, bear in mind not all standard fire doors are suitable for double-action.

The office being a habitable room should have the same level of fire compartmentation as the rest of the house. So yes a fire door would be required between the office and garage. Have you considered how you might escape from the office without using the garage?

All new fire doors must have documentary evidence of fire resistance performance but they don't have to have labels or plugs. So ask the supplier or manufacturer to provide it.

Advice given earlier is based on relevant guidance. I am not aware of any guidance to support adding thin strips of timber to the inside face of the door frame for reducing the gap, as an alternative to reinstalling the door frame.

Sorry, can't help you on that one.

There is no guidance that thicker rebate stops mitigate the effect of excessive door to frame gaps. Where restricted cold smoke spread is a requirement, effective smoke seals will be necessary.

Contact R&T technical at https://www.ratman.co.uk/contact/

This is a question for Local Building Control. https://www.gov.uk/building-regulations-approval Myself, if I were replacing doors I would use that opportunity to fit fire rated ones.

Lipping depends on what fire performance certification exists for the door. I like lipping done correctly, but carrying out such work on site may void the door's third party certification.