Mould on front and back door?

We have mould on both back and front door with water dripping from letterbox. The mould is all the way around the door and on the wood itself. We've cleaned it but want to stop it coming back. What could be the issue?

Asked by Alex on 30th Jan 2023
Expert Trade Answers
"… if the mould is already inside the wood door it is a long procedure to get rid of it. It won`t help if you just rub it of and repaint. That mould grows inside the wood grain and it will continue appearing on the surface again and again. Its easier and cheaper to change the door to the new one! Hope it helps."
Answered on 9th Feb 2023 - Member since Feb 2023 - report

If its a wooden door then it bascially needs changing for pvc door which is insulated."
Answered on 5th Aug 2023 - Member since Nov 2019 - report
"Mould and condensation is the result of the house sweating are your house vents and airflows blocked or sealed up try a sall vent on one of the doors like a closeable trickle vent clean the mould off with bleach"
Answered on 13th Oct 2023 - Member since Jan 2023 - report
"THe warm moist air from your home is condensing on the cold surfaces of the doors - you could reduce the temperature of your home, improve the thermal efficiency of the doors by installing new ones or try to increase circulation of air throughout the house. New doors may be the best option. good luck

Answered on 30th Jan 2023 - Member since Dec 2022 - report
"Could be the dampness inside the door or could be the letter box is the problem"
Answered on 30th Jan 2023 - Member since Jan 2023 - report
"Venting is probably the reason for this if the door is plastic you my want to check if the vent s are not blocked, if they are it my be better to take the panel out of the door and clean vent holes"
Answered on 1st Jul 2023 - Member since Jun 2023 - report
"The draught excluders could be faulty making the cold are and warm are create moisture, exually the seal on the outside of the door frame could also be faulty can you provide photos"
Answered on 31st Jan 2023 - Member since Jan 2023 - report
"Change gasket on letterbox or change letterbox and run a bead of sealant around it to stop any water"
Answered on 22nd Oct 2023 - Member since Aug 2022 - report
"The main issue here is the water ingress through the letterbox.
This would be sorted by checking the letterbox fit and taking steps to correct/seal this.
This has however lead to the issue of mould, which in wood is pretty near on impossible to remove. Once the spores have set into a porous material like wood, they are in there forever and even with bleach and heavy duty mould killers you are only ever going to clean the surface and not the inside of the door.
So unfortunately the only real way to rectify this situation is to replace the door and make sure that it is fitted by a reputable tradesperson who will give you a decent, watertight finish."
Answered on 20th Jan 2024 - Member since May 2023 - report
"This issues could be caused by water getting into the timber causing it to go damp which would lead to mould."
Answered on 23rd Oct 2023 - Member since Oct 2023 - report
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