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Question:

why is the cement-board lintel over my front door separating from the brickwork?

We have a home built in 1999 in the Gulf Coast area. On either side of the front entrance are flat cement board posts and above is a lintel. Last year I noticed the lintel was starting to have a gap between the brick and lintel itself as well as pulling away the top of one of the posts. I used heavy-duty exterior adhesive to try to reattach (used the ladder against it as pressure). I caulked and painted afterwards. Now, the separation is back, but much worse. I'm not even sure who to call to look at this. If I know why this happened, I could better figure out the next steps. Any ideas (I can find nothing through my research).

Answer:

it probably is a matter of trapped moisture and oxidation of the lentil.most residential construction in that area is done on which is known as a floating footer pad pour because of the hydrostatic tables and sand to alleviate subsidence,and if it is settling you would see other indicators such cracks,doors and windows not opening or sticking. your best bet is to remove it clean the lentil and prime it dry out completely and reinstall cement board after removing a 1/8 of a inch from each side.then use PL400 of a Liquid nail product and brace evenly then caulk with a 30 year pure silicone product for exterior application
May 11, 2017
Could be what the first poster suggests. Without actually seeing it, it's really hard to tell. Are there other places in the home that are suddenly not level? Or things that used to be square now not square? That's usually a good indication of a foundation issue. The first thought that popped into my head was a moisture problem from some where. Most likely a leak above the area. Could be very small but over time is creating issues within the wall and the cement board will have a tendency to attract the moisture. Even a bad seal around a window or the soffit area above will create an issue such as you are experiencing.
May 11, 2017
it truly is a few thing I even have under no circumstances seen over here. the front door replaced into for travelers, and that they'd be led into the front room, a room oftentimes utilized by making use of the father and mom interior the evenings. childrens forbidden. Our get entry to replaced into to stroll around to the back of the abode and enter there, into the kitchen. as a rule the front door in basic terms must be opened with a key from the outdoors, and a turn button on the interior, so it replaced into constantly locked. The back door replaced into constantly unlocked and so some distance as i can bear in mind, no longer even locked in a single day. The origins in the back of the turn 21 and get the main of the door is obscure, however the context replaced into that as quickly as you became 21 you gained the main to the front door, and ought to come and bypass as you thrilled, an illustration of adulthood. That replaced into the thought I lived with interior the dissimilar properties I lived in as I grew up.
May 11, 2017
Well you've got some serious movement going on for sure.However I doubt it's the house bc anything to do with the main foundation would have shown itself long before this.I'd be looking at whatever those posts are anchored to myself.
May 11, 2017
it sounds like subsidance , the house is sinking /settling this could be a very serious problem if the foundations are sub standard you need to get an engineer to carry out a survey now to acess whats the cause of the movement
May 11, 2017

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