Under strength beams - strengthen structural wooden beams

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Types of wooden beam weakness that can be repaired


1. Bending/deflection - caused by overloading, undersized timber section, poor quality timber, insect or rot damage

2. Change of Use - from domestic to commercial, added loading such as: storage, filing, piano, Museum

3. New Build - need for lowest height of timber to preserve headroom, loft conversion, ring beams, ridge boards, joists

4. Breakage - partial or complete failure

Insect attack - broken Rafter

Total failure due to severe insect attack

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Timber Beams that have partly broken or been eaten by Rot or Wood Boring Insects can be repaired using High Tensile Steel Bars, Zinc Plated Allthread, or Epoxy-Glass Bars or Stainless Steel Bars. The bars are then embedded in Structural Epoxy Pouring Resin or Grout.

High Tensile Allthread inside a hollowed out beamShear Connectors in Slots

New timber component in place - note bars in slots

Independent Engineering calculation service available, £350 per beam, Indemnified (Insured)

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How to increase strength


Upgrade the Beam or Joist - cut a slot, or slots, along the length to within about 40mm of the base and bond in BS4449 High Tensile Rebar with Structural Epoxy Pouring Grout. This is know as a 'modified flitch' design and approximately doubles the stiffness of a typical timber, in bend.

Excessive bend in a barn tie beamSlot cut into the top of the Tie Beam to hold rebar

Me pointing to the slot with the first rebars dropped in on spacersThe finished upgrade - Structural Epoxy Pouring Resin covering all the rebar

Barn, Somerset - overloaded tie beams in a barn now carrying heavy clay tiles on the roof (had been a thatched roof and then was converted to a lightweight galvanised sheet roof).

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Loft Conversion, Newton Abbot - maximum ridge board to be 12" x 4" (300mm x 100mm), not strong enough to meet Engineers specification.

For more Technical Information and a Photo Gallery go to:www.timber.org.uk

Farmhouse floor joists on carrier beamsCarrier Beam slotted to take re-bar to increase bending stiffnessUpgraded Floor Beam

Beam upgrade with re-connection of joists

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How to extend ends that have rotted


Cut out the decay and either:

1. Cut off the end completely and fit a Timber-Resin Splice, priced and manufactured to fit the exact size and timber type.

2. Build a box around the missing part, fit Rebars to extend into the sound part and fill with Structural Epoxy Pouring Grout.

Timber Resin Splice top slot fixing methodTimber Resin Splice top slotted and then resin filled

Theory and Practice - Timber-Resin Splice top slot (Type C) joist end repair in place

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Bindon House Hotel, Somerset - truss ends and tie beams, Dry and Wet Rot. The ends were replaced using TYPE E Timber-Resin Splice units, made to measure .

Beam End Repair - ClerkenwellTimber Resin Splice - dry fitted ready for resin pouringSteel bars and anchors ready for resin pouring

Timber-Resin Splices and bars in place.

For more Technical Information and a Photo Gallery go to:www.timber.org.uk

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Property Repair Systems

T: 01626 872886

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Other Property Repair Systems Sites:

www.drywallandfloor.co.uk - membranes for lining damp walls, floors, basements and cellars

www.epoxy-info.co.uk - epoxy resins for repairing wood, concrete, brick and stone

www.fire-door-paint.co.uk - upgrade doors to 30 minutes fire resistance

www.joist-repair.co.uk - how to quickly repair joists and beams of any size

www.propertyrepairsystems.co.uk - our Home Site

www.steel-fire-paint.co.uk - treat steel with Intumescent Paint to provide fire protection

www.timber.org.uk - systems of repair, with step by step methods

Site written by: David Moore

David Moore, B.A. (Hons.), C.T.I.S., C.R.D.S. Technical Author