According to msn real.
Plaster is cracking around windows and doors.
It is applied on the surface of masonry of the house to get the smooth decorative surfaces.
Diagonal stepped cracking often indicates that the lintel that supports the masonry above the opening has failed.
Check whether water is leaking into the crack.
Use acrylic latex caulk and put a small bead of caulk along the crack.
Cracks in the walls it s a different story if the cracks are in the walls by the doors and windows and not just in the trim.
In my opinion if the cracks are all internal plaster work etc it is not subsidence it will be the cause of what i have mention above.
If it were subsidence you would see cracks in the external masonry more than likely running down the sides of windows and doors and through the masonry between them.
If you determine there s nothing obstructing the swinging motion of the door it might be a sign of a moderate to severe foundation change often resulting in wall cracks.
Most small cracks in drywall or plaster walls are not serious and are caused by seasonal expansion and contraction of the wood framing in your house over time.
They re often found at the corners of window and door frames and can be patched using spackling or joint compound.
Cracks in plaster plaster is a very thin component made of mortar.
Those types of cracks indicate some sort of shift in the house itself.
Diagonal cracks above window openings and door openings are common structural defects that show signs of movement which will need to be rectified.
It protects the outer wall from rainwater.
Diagonal cracking above opening.
Houses of any age move and shift subtly over time and the weakest area in a wall is the most likely to crack.
These stress fractures will quickly turn into larger cracks and unsightly holes.
Hairline cracks over doors and windows are likely due to settling.
Using your finger rub the caulk into the crack with a motion that is perpendicular to the crack.
Small cracks located above interior windows or doors are usually harmless.
This will force the caulk into the crack.
Wipe off all the excess with a sponge so that the only caulk left is in the crack.
I hope this has helped answer you question.
If the cracks are outside though you may just have to inspect the trim around your doors and windows periodically and fill cracks as you find them.
Never take chances with cracks that leak because these are sometimes serious.
The repeated force of the door closing can eventually cause stress fractures in the surrounding plaster.
