Types of timber 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
Total failure due to severe insect attack. Excessive deflection, overloaded. Ridge beam parts for Loft Conversion.
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Examples of Beam repairs - weakness caused by insect attack and rot
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.
New timber component in place - note bars in slots - ready for resin pouring or injection..
Independent Engineering calculation service available from us, from £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.
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 galvanized sheet roof).
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Examples of beam strength upgrading using bars and resins
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
Beam upgrade with reconnection 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.
Theory and Practice - Timber-Resin Splice top slot (Type C) joist end repair in place
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Examples of extending rotted beam ends using bars and resins
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 .
Timber-Resin Splices and bars in place.
For more Technical Information and a Photo Gallery go to:www.timber.org.uk
Go Direct to Timber Repair Shop
SHOPS
- TIMBER REPAIR SHOP
- EPOXY REPAIR RESINS SHOP
- JOIST REPAIR KITS SHOP
- FIRE PAINTS SHOP
- MEMBRANE FOR DAMP WALLS & FLOORS SHOP
- TIMBER REPAIR SHOP
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Property Repair Systems
T: 01626 872886
E: Mail us help@propertyrepairsystems.co.uk
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
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