Category: Pipes

Notching Joists For Pipes And Cables

by

Scott Morris

Notching Joists for: Pipes and Cables

Difficulty Level

Beginner/Intermediate – the actual notching of the joists is not hard yet getting to them might be a more difficult as it consists of taking up the floor boards.

Listing of Draper tools required

Draper Tenon Saw

Draper Wood Chisel

Wide bladed chisel

Draper Hammer

A pencil

Approximate time to finish

Depends upon quantity of joists you have to notch.

Notching one joist should not take above 10 to 15 minutes, including measuring however allow time for getting at the joists.

Degree of Risk

Medium Youre sawing below the level of your body which is often awkward hence take care and wear defensive eye protection if you use any hammer and chisel.

Why are we doing it

Joists are the horizontal beams that span two walls to take the weight from the floorboards as well as items in the area.

When you are running the pipes under floorboards and also across joists, they usually are housed within notches cut within the joists themselves.

The best way to get it done (In easy to follow steps)

1) Lift the floor planks to view the joist

Continually use protecting eye protection whenever chiselling wood. Make use of a wide-bladed chisel to softly lever up one side of your plank. do the job along the board and then repeat to the opposing side.

You may find sliding a small piece of wood beneath the elevated plank is effective. Work along the plank until it may be prised upward and taken out.

You will need to use caution as there may be sharp nails protruding from the boards.

2) Mark out in which you wish to place the pipe

Notches should only be made within the top edge of the particular joist.

Typically they must be no closer to the structure supporting them than an eighth of the length of the joist and no further away than a of the length.

This is to avoid the region of maximum shear force (the end of the joist), and the area of maximum\utmost bending in the joist (the middle,is potentially its weakest point).

For example if the joist is actually 5m long the notch should not be any closer to the end of the joist than around 60cm and no further away than 1.25m .

3) Assess the size of the pipe and draw out the notch

The depth of the notch ought to be as small as possible i e . 5mm in addition to the diameter of the pipe. In case the notch is made too deep it could weaken the actual joist. When you have measured this mark the wood in pencil

Every pipe needs its own pair of notches and rest on a pad of lagging (insulation).

The actual lagging can safeguard the pipe from any kind of movement because of vibrations and stop creaking.

4) Make the notches employing a saw and wood chisel

Using a Tenon Saw meticulously saw along the vertical markings.

The smaller size of the Tenon Saw helps it be the more effortless option in this job.

Using the wood chisel and hammer commence tapping out the middle of the notch.

Dont be tempted to knock out the notch from the horizontal marking.

This will frequently result in the getting uneven. Preferably gently tap at the notch from the top, working downwards until you achieve the necessary depth.

You will discover after making the first notch the work will become less complicated.

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