Plumbers Notches and Holes

Repair weakened Joists

Property Repair Systems - joist and beam repair help - 01626 331351

 

 

 

 

 

     

Repair notches and holes made in wood joists by plumbers. Free advice and method details for filling notches, holes and slots around pipes and wires.

We provide help specific to your floor joists - E Mail us the photographs and we'll cost the materials and guide you through the repair options.

Call for immediate Free Help on: 01626 331351.


Examples of typical Plumber's Notches

Two rows of pipes sitting in large notches cut into the upper half of the joistsPipe hole in joist

Pipes sitting in large notches in the upper half of the joists

Massive notch cut for a waste pipe, extending below the mid point of the joistwater pipe slots in joists - way over sized

Waste pipe notch extending down below the mid line of the joist.


Why Notches, Holes and Slots can be a problem in joists

1. Rules are laid down in the Building Regulations regarding the allowable position of holes and notches, so if you are involved with a Building Inspector you will need to comply with those position rules.

2. Notches and holes above the mid line (or neutral axis) weaken the compression zone of the joist, meaning that the top edge can try to collapse inwards under load.

3. Notches or holes below the mid line weaken the timber in tension, meaning that the joist may open up at the bottom edge under load.

4. Holes and notches, as well as knots, can weaken the joist - the further they are placed away from the support wall and the nearer they are to the middle (the point of maximum bend) the weaker the joist will be under load.

Click here for Free Access to Official Guidelines for joist notching - see Section 2, Diagram 2.1


How to repair Notches and Holes in damaged joists

1. Assuming that the pipes or wires will have to remain in place:

A. Vacuum out all dust

B. Wrap the pipe or wire in a single layer of non sticky plastic, so that it can move inside the repair when it expands and contracts due to changes in temperature

C. Mix up our Mouldable Epoxy Putty and ram it around the plastic covered pipe or wire to completely refill all the spaces. This will provide full compressive strength restoration on its own.

D. Add our Heavy Duty Steel Strapping in the top edge of the joist, for top half notches, and in the lowest position available on the two faces for lower half notches or holes. This strapping must be bonded in place, to spread the load along the joist at least 200mm in each direction beyond the edge of the defect. Fix in place using our Epoxy Adhesive Paste using the minimum number of small screws to hold the strap whilst the resin sets. Excessive use of screws or nails can lead to splits along the grain - let the resin do the work.

Steel strapping for reinforcing joists - galvanised

Zinc plated steel strapping = 28mm wide x 4mm thick, 6mm holes at 25mm centres

2. Assuming that the pipes or wires can be removed:

A. Vacuum out all dust

C. Mix up our Mouldable Epoxy Putty and ram it in to completely refill all the spaces. This will provide full compressive strength restoration on its own. If the spaces are large use undersized pieces of wood as bulk filling, with Mouldable Epoxy Putty used to fill the gaps and provide a permanent bond.

D. Add our Heavy Duty Steel Strapping in the top edge of the joist, for top half notches, and in the lowest position available on the two faces for lower half notches or holes. This strapping must be bonded in place, to spread the load along the joist at least 200mm in each direction beyond the edge of the defect. Fix in place using our Epoxy Adhesive Paste using the minimum number of small screws to hold the strap whilst the resin sets. Excessive use of screws or nails can lead to splits along the grain - let the resin do the work..


Products required to repair Notches and Holes in damaged joists

1. Mouldable Epoxy Putty - available in 500cc and 1 litre packs - two part, one to one mix ratio, mix in the gloved hand.

Mixing Mouldable Epoxy PuttyMixed epoxy putty, ready to place

Hand mix the Epoxy Putty in the gloved hand, then ram it into the spaces to make them sound.

2. Heavy Duty Steel Strapping - available cut to length - call us to request prices on 01626 331351. Allow a minimum of 300mm of strapping each side of the outer limits of the notch or hole.

Heavy duty steel  strapping for joists.

The strapping is fitted along the top or bottom side faces of the joist,

bonded in place using our Epoxy Adhesive Paste - only use the holes for

a few small screws to hold the straps whilst the resin sets. Using too

many screws can split the wood.


JOIST REPAIR AND RELATED SHOPS

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EPOXY REPAIR RESINS SHOP

FIRE PAINTS SHOP

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MOLD SHOP

TANKING SHOP

TIMBER REPAIR SHOP

WOODWORM TREATMENT SHOP


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Property Repair Systems

T: 01626 331351

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E: help@propertyrepairsystems.co.uk


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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

www.woodworm-info.co.uk - how to kill and prevent woodworm and death watch beetle

www.woodworm-expert-advice-forum.org.uk - all your questions and our answers about woodworm treatment DIY


Site written by: David Moore

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

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