Concrete lintel

We have a huge crack on the concrete lintel above the patio door. This door is now internal as it leads to the conservatory.
How does that happen?

Asked by Alice on 3rd Jan 2024
Expert Trade Answers
"This I would say is down to movement, settlement ( subject to how long it has been there?) and maybe from the work undertaken on the lintel wall to install your conservatory
I would suggest you had it surveyed just to clarify it is just cosmetic and not serious splitting of the concrete lintel"
Answered on 3rd Jan 2024 - Member since Jan 2023 - report
"Is it the lintel or the plaster.
Is the lintel exposed"
Answered on 3rd Jan 2024 - Member since Aug 2023 - report
"Vibration, subsidence? I could have happened when the conservatory was built."
Answered on 15th Jan 2024 - Member since Jan 2024 - report
"Older concrete lintels have a problem with aspement which is the when moisture gets into the lintel and gets to the reinforcement or the re-bar the rust will cause it to explode if it's not too far gone this can be repaired."
Answered on 3rd Jan 2024 - Member since Jun 2021 - report
"Lintel failing most likely water damage rusting reinforcement bars in lintel will need to be replaced"
Answered on 3rd Jan 2024 - Member since Nov 2023 - report
"Heavy wight in top with some movement make it cracked"
Answered on 3rd Jan 2024 - Member since Dec 2023 - report
"Due to age and wear and tear cold diesent help either u can re point it up to get rid off the cracks"
Answered on 7th Jan 2024 - Member since Oct 2023 - report
"All concrete does crack there’s no way to stop if but you can help prevent it by adding a certain mix of waterproof water in to the mix when mixing if mixing it at home if ordered it and getting it deleiverd you could ask them to add a certain kindve aggregate to help last longer."
Answered on 13th Jan 2024 - Member since Jan 2024 - report
"Please note that concrete lintel have no matching strength that RSJ steel. As you are saying this is now internal, that gives you an answer for reasons why it's cracking. We specialise in these types of cracks and the force above has changed due to work done before or other forces not being even.

As I said before Concrete lintel has 1 or 2 steel rods embedded in the concrete so that when it cracks they will protect it from breaking whilst RSJ steel protects the collapse of a house by holding and preventing those types of cracks.
The weight of the steel is done by calculating ghe load above the the steel so that the force will be sustained . Its clear something is happening above the lintel and we normally give free advice to anyone who want to know more before decide to make changes on structural walls."
Answered on 19th Jan 2024 - Member since Jan 2024 - report
"It could be movement or settlement cracks, if water ingress then it affects the rebars inside."
Answered on 8th Jan 2024 - Member since Nov 2019 - report
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