Timber Joist Repair

Repair Joist Ends, splice on new wood,

fill holes, slots and notches in joists

Property Repair Systems is OPEN FOR BUSINESS - 01626 872886

Talk to real people about rot in joists

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Repair wood joists - Joist Repair Plates or Joist Splice Plates

Joist Repair Kits - ready made Kits, including the timber machined by us to original size, if necessary.

Joist end repair and splicing plates

Joist end repair and splicing plates


Hi all, quick E Mail just to say thanks - brilliant product, the Bower Beams saved me so much work it is untrue!! Easy to fit and work perfectly, I know they are quite simple as a concept, but so often you buy workarounds and they just prove to be a waste of time. Absolutely would use you again and will recommend to a builder friend as this was such a positive experience and easy job for me to do on my own as a DIY fix. I did it over two lazy, coffee fueled mornings (4 joists) but reckon I could have done it in one morning if I'd been bothered.

Thanks to all and take care. Samna.

Joist Repair Site Index
  • Joist Splice Plates - kit joins joists to new lengths of timber, prices
    Repair Tradesman's Damage
  • Holes, Slots and Notches - how to repair and strengthen tradesman damaged joists
    Replace sections of joists and beams - Timber-Resin Splicing

To repair joist ends or replace sections call: 01626 872886

Joist End Repair Plates are supplied as pairs of galvanized steel plates, pre-drilled, to be fixed with Coach Screws (included). The plates rest in or on the wall and allow for the rotted end to be cut off.

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All types - maximum joist width allowable is 3 inches, (75mm), for all plate sizes. They are for Domestic Floor Loadings only.

BM6 Kit - allows for up to 6 inches, (150mm), to be cut off - joist size minimum 4 inches, (100mm) deep up to a maximum of 7 inches, (175mm) deep.

BM9 Kit - allows for up to 9 inches, (225mm), to be cut off - joist size minimum 4 inches, (100mm ) deep up to a maximum of 7 inches, (175mm) deep.

BM17 Kit - allows for up to 17 inches, 432mm, to be cut off - joist size minimum 6 inches, (150mm) deep up to a maximum of 9 inches, (225mm) deep.

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Shown below - BM6 next to a 9 inch (225mm) deep timber. Normally a BM17 would be used for this size.

Note - coach screws supplied with the kit require pilot holes to be drilled, to avoid splitting the wood.

Placing a Coach Screw into a BM6 Joist End Repair PlatesBM6 Joist End Repair Plates openBM17 Joist End Repair Plates

Joist End Repair Plates - fixed with coach screws using a socket wrench.

These steel plate BM Kits can also be used as splices to join on a new piece of joist - ask for double the number of Coach Screws, plus two Bolt Sets for extra security.

When working above ceilings the plates can be reversed so that the flanges rest on the ceiling itself, to avoid opening up and having to rebate the underneath of the joists.

Don't forget to treat all cut ends of just using our Boron Ultra Gel 20% to prevent future rot and insect attack.

We can provide joists machined to match the old Imperial sizes - modern joists are Metric and will not be suitable for plate splicing due to being thinner than the originals.

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Alternative joist repair method - Timber-Resin Splice Kit

For full technical details go to: https://www.timber.org.uk/

Method - How to repair Joist Ends with a Timber-Resin Splice Kit

  1. Prop the joists to ground
  2. Cut off the damaged part (any length)
  3. Make a slot in the top face, or a pair of slots in the side face to our Design Sketch (provided)
  4. Dry fit the new piece of wood which already has bars fitted (this is the Timber-Resin Splice itself) - if it fits properly seal the butting face with the quick setting filler provided
  5. Complete the repair by either pouring resin into the top slot or injecting into the side slots
  6. Timber-Resin Splice to joist, resin being poured into a top slot

Pouring resin into a Top Slotted  Timber Resin Splice

Larger joists, in manufacture, showing the connector bars

Large Timber Resin Slices

Request Quotation Form - to request a price and Design for your repair

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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.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

www.timber-repair.co.uk - how to repair timber beams

Site written by: David Moore

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