Heritage & traditional property · Northumberland

Timber beam repairs

Repairing decayed or damaged structural timbers – beams, lintels, joist ends and roof timbers – keeping as much original timber as possible.

Timber beam repairs by Northumberland Building

Older Northumberland houses and farm buildings have a lot of timber built into them: beams, joists, lintels behind stone, wall plates and roof trusses. Where moisture gets in – through a leaking roof, a blocked gutter or cement pointing – timbers can rot, particularly where their ends sit in damp walls.

Finding the cause

Replacing rotten timber without stopping the moisture is a waste of money. We start by finding where the water is coming from and dealing with that, then assess how much timber has actually decayed. Often the damage is limited to the ends of beams and joists.

Repair options

  • Splice repairs – cutting out the decayed end and joining in new, seasoned timber.
  • Steel repairs – flitch plates or brackets to strengthen or support a weakened beam.
  • Resin repairs – sometimes suitable for specific situations, following the engineer's design.
  • Replacement – where a timber has decayed throughout, replacing like for like.

Structural repairs to beams and roof timbers often need an engineer's design and building control involvement. On listed buildings, repairs that keep original timber are usually preferred.

Timber beam repairs: common questions

Is it dry rot or wet rot?

Most decay in houses is wet rot, which stops when the timber dries out. Dry rot is less common but more serious and spreads further. Correct identification matters, and both need the moisture source fixed.

Do I need chemical timber treatment?

Not always. Removing the moisture source and replacing decayed timber is the main cure. Treatment may be used on new timber in contact with damp masonry.

Can a sagging beam be strengthened in place?

Often, with steel plates or additional support designed by a structural engineer, avoiding the need to remove it.

Where we offer timber beam repairs

We carry out timber beam repairs across Northumberland, including:

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Planning timber beam repairs?

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