Wood beams and columns in traditional Iranian houses need their own kind of upkeep; learn the warning signs of decay and where reinforcement ends and full replacement begins.
Many old houses in Khomeyni Shahr and the historic district of Isfahan carried their roofs on wood beams and wood columns in the veranda, not just on brick and mud walls. Decades later, when such a house is renovated or a new owner wants to bring the veranda back into use, these beams are the first element that needs inspecting — and usually the first thing handled the wrong way.
A healthy wood beam gives an even sound and doesn't yield to finger pressure. A few signs that usually call for immediate repair or an expert's opinion:
If any of these signs show up, the best move is opening a small section of the cladding around the beam to see the real condition of the wood underneath; judging from the painted outer surface alone can completely hide the true state of things.
The general carpentry rule here is the ratio of sound remaining wood to the beam's full cross-section. If rot or termite damage covers less than a third of the cross-section, the beam can usually be saved by removing the damaged part and splicing in a new piece of matching wood (known as a "patch" in traditional carpentry). If more than half the cross-section is gone, fully replacing the beam — with wood of the same size and, where possible, a similar aged look — is the safer choice. This is exactly the line that separates restoration from full reconstruction of historic buildings.
Unlike a roof beam, which usually suffers from above (water leaks), a veranda column tends to suffer more from below — where it meets the courtyard floor or damp paving. Raising the column's base off the damp ground with a short stone or metal footing is one of the simplest and most effective preventive steps, and it's one that many old houses still haven't had done.
For patching or replacing traditional beams and columns, it's best to use the same wood family as the building's original timber (often local plane or poplar), not whatever is on hand. A difference in density and shrinkage between two different wood species eventually causes uneven cracking at the joints. Before any cutting, the moisture content of the new wood also needs to match the surrounding old wood — the same standard covered in wood moisture levels before construction — otherwise the new beam won't settle into place even after a few months.
When working on woodwork in historic buildings, restoration, reconstruction, and recreation mean three different things — and choosing the wrong approach can destroy a building's historical value.
A wooden mosque pulpit or mihrab can be a century old, and damp, cracking, and faded color make the work difficult; here's the line between restoration and rebuilding for these delicate carvings.
A sagging beam, rot where it meets the wall, and a creaking ceiling each have a different cause and a different fix — misdiagnosing the damage only makes it worse.