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Hello @PDW125 Thank you for the detailed summary of actions. This is very helpful. Yes, letter box looks exactly as you wrote - with double seals and brush inserts. Not yet. Technically the installation is not yet complete. Our installer will be returning in Jan to replace glass in side panels...

It is a single layer DPM unfortunately. If I am able to squeeze another DPM (2) under the frame - should the rest of that second DPM be covering the floor (part covered in tiles at the moment) ? Please excuse my ignorance - do you mind clarifying what you call "inner leaf"?

Hello @TomGW I have posted some photos (probably at the same time when you were writing your message), hopefully they can answer some questions. This is a detached house. No room on the left side of the hallway, just brick, no neighbour's house There is a room on the right sight of hallway...

Hello @Doug71. Your assumption is correct. One small detail - as you will hopefully also see from the photos I posted just now (see message above) - there is no "internal room" on the left because there is just no space for it. Area of "internal room" on the left hand side in your drawing is...

Here are some photos from the outside to possibly give you some more context Original (now removed door) New door

This is perfect. Thank you @Sachakins, @baldkev, @Jameshow for the detailed steps and thank you everyone in this thread for your insights. It has been very educational. I believe I now have a good idea of what I have to do. Merry Christmas

Hello @Sachakins. Thank you. This is reassuring. What would you call a "proper damp-proof" please? Does this necessarily mean "tanking slurry" mentioned earlier in this thread or can it be something simpler, like this one: Capital Valley Plastics Ltd Damp-Proof Membrane Black 1000ga 3 x 4m...

If you mean areas where arrows point in the screenshot below then it appears as a single skin brick.

Makes sense. My assumption is - given that the contact area between the door and the outer brick is small the amount of water/moisture that can travel via that bridge is also small. And if I was to thermally insulate the walls then it should act as a barer between warm air inside and cold...

I believe this brickwork is a cavity wall. Yes, original construction did not have cavity insulation. I can not say about this current house, but neighbouring houses had cavity wall insulation done by filling the wall cavity with some sort of foam about 10 years ago. I can only assume that in...

Indeed. When the new door was installed (right before the old one was removed) there was no way to open the new door fully. LOL. Yes. The new door is flush with the front wall of the house. It is exposed to the elements the same way our patio doors are and we have had no issues with the patio...

Hello @baldkev I am sorry I forgot to explain - the original rain porch was recessed into the house rather than built outside of the house. The new door is now flush with external wall on the front of the house. I am led to believe that this house has a standard for 1970s build cavity wall...

Hello @BillHoughton, It is a fair suggestion, especially if you have not seen inside of my house. The issue is - we got fed up with not being able to enter the house properly. Where the old door used to sit - it left almost zero space to take the shoes off. When 2 persons are entering the house...

Yes, thank you. Answers in this thread sort of put my mind at ease explaining that that there is no major issue with the new door as such, but rather the problem was caused by the time of year/weather and location of the new door relative to the inside/outside of the house. It was also very...

This is an interesting contraption. Have not heard of this before. Will keep it in mind. Thank you. I have borrowed 2 mains powered dehumidifiers from a friend today. My current plan is to extract moisture from the walls and insulate as per earlier suggestions in this thread. If that does not...

Thank you. Based on what everyone in this thread has said and the bucket example @Doug71 mentioned it looks like a mains powered active dehumidifier is going to be the quickest in this instance. I have not had much success with the passive/chemical ones in the past - they take way too long.

Agreed that the letter box is a problem. Problem is - when it comes to selling the house - I am not sure I want to advertise that there is something so wrong with the house that we had to block the letter box. Thank you. Will keep this in mind. Cavity walls of the house were filled at some...

Thank you @mikej460. I will keep this in mind. To the left of this door area there is a staircase which leads to 1st floor with many cubic meters of air to (hopefully) somewhat distribute moisture coming from the porch. Also, at least for now, I am going to assume that the letter box is going...

Hello @baldkev This sound like an interesting approach. However - given how small my now "ex-rain porch" area - if I cover it with something impermeable, would not this just cause any moisture from the walls and ground to travel a bit further into the house and surface on on the original...

I was thinking - since we have 70mm in area "3)" (from the tiles to the internal floor level) - I could do something like this 1. put damp proof membrane on the tiles (like if I was preparing this for shower tray) 2. then 50mm insulation board on top of the membrane 3. then 10mm (or so)...