How
to increase the strength of a timber - weak, damaged, overloaded
| How
to increase the strength of a timber - weak, damaged, overloaded | |||
| |||
| We are a National Service - with local Specialist Surveyors | | ||
| |||
| Types of 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 |
 |
| Example | |
| 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. For more Technical Information and a Photo Gallery go to:www.timber.org.uk
Beam upgrade with re-connection of joists |  |
| 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. Independent Engineering calculation service available, £150 per beam, Indemnified (Insured) 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.
Understrength floor timbers - awaiting upgrade from above |  |
| 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 (Type C) joist end repair 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 . For more Technical Information and a Photo Gallery go to:www.timber.org.uk
Timber-Resin Splice Type E in place |  |
| How to prevent Timber damage | |
|
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 |  |
| Examples | |
| 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
Drilling patterns for window cill preservation with Boron |
Property
Repair Systems |
