Woodworm Damaged Timbers - how to stiffen
and strengthen weakened wood
Property Repair Systems
01626 331351
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Woodworm Damaged Timbers - how to stiffen and strengthen weakened wood
| Property Repair Systems 01626 331351 | |
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| Woodworm damage - restore timber strength | | ||
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| Types of weakness that can be repaired | |
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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
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Total failure due to severe insect attack |
| Example | |
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Barn, Somerset - overloaded tie beams in a barn now carrying heavy clay tiles on the roof (had been a thatch and then galvanised sheeting). Loft Conversion, Newton Abbot - maximum ridge board to be 12" x 4" (300mm x 100mm), not strong enough to meet Engineers specification.
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Beam upgrade with re-connection of joists |
| How to increase strength | |
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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 Resin. This is know as a 'modified flitch' design and approximately doubles the stiffness of a typical timber, in bend. Independent Engineering calculation service available, £300 per beam, Indemnified.
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New timber component in place - note bars in slots |
| Examples | |
| Farmhouse, Crediton - understrength timber joists for proposed use as a first floor bedroom. These were slotted from above and Rebar bonded in using Structural Epoxy Pouring Grout.
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| How to extend ends that have rotted | |
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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.
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Timber-Resin Splice top slot (Type C) in place |
| Examples | |
| 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 .
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Timber-Resin Splice Type E in place |
| How to prevent Timber damage | |
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1. Protect structures from penetrating and rising dampness 2. Apply breathing protective coatings to external timbers - Vinabore 3. Treat vulnerable timbers with Boron Products - Boron Rods, Boron Paste, Boron Gel and Ultra 12 powder in water, by spray or brush for indoor use, to floor and roof timbers. |
Diagram of Boron Paste and Rod injection holes for a bearing end
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| Examples | |
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Ships - The Unicorn, Dundee, Wet and Dry rot Castles - Dartmouth Castle, Taymouth Castle Houses - The Log House, Bindon House Pre-Treatment - 'Timborising', extensively used in New Zealand and Canada, 'green' timbers soaked in boric acid before drying and cutting to size
For more help go to: www.boron.org.uk - how to use Boron based insecticides/fungicides to treat timber rots and insect attack www.dampness-info.co.uk - how to treat penetrating dampness in walls and plaster www.deck-treatment.co.uk - how to treat patio decks and yacht decks www.dryrot.biz - how to cure and prevent Dry Rot www.epoxy-info.co.uk - epoxies, polyesters and polyurethanes for all applications www.joist-repair.co.uk - how to quickly repair joists and beams of any size www.timber.org.uk - systems of repair, with step by step methods www.timber-repair.co.uk - how to repair timbers in buildings without wrecking the place www.propertyrepairsystems.co.uk - fire paints, crack injection, metal fabrication, hygiene treatments
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Drilling patterns for window cill preservation with Boron
Property
Repair Systems |
