Replacing doors in a HMO

[Guest Liamoak]

Hi,

I was hoping to get some advise before taking on a job. An old Victorian house based in east London needs to upgrade their doors to FD30 in line with regulations. The issue I have is that the existing frames are solid hardwood, architraves are original all sealed which is great, but due to subsidence the heads are very wonky. My question is, to avoid ripping out the original frames and opening a can of worms as the house is so old. Can I fit hardwood to the head of the frames to make them level (so the head of the fire door blanks remain untouched). I can then cut the doors from the bottom as the blanks will allow me to cut to the smaller heights? 

Any advise would be appreciated, I understand everything needs to be above board but the cost implications for replacing all the frames along with the potential damage Id like to avoid if possible. 

Thanks,

Liam

[Neil Ashdown MAFDI]

This might help?  Lots of technical data on fire door blanks and you can contact their Technical Dept to discuss your plans:   https://falcon-timber.com/downloads/