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Fitting a door casing is a job for the expert, read on and become that person!

Axe
Wedges
Straight-Edge
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Installing Internal Door Casings 

 

Plug it
If you are fixing to brickwork where there are no pads, then you should use timber plugs. Timber plugs are lengths of timber, about the same width as the brickwork, specially shaped (by hand/axe) to do the job. They are driven into the 'raked out' joints to a depth that exceeds the length of the nails and to a depth which ensures a firm hold into the joint.  Different to 'pads', timber plugs are inserted after the brickwork has been formed and the grain runs the opposite way. The end grain of the plug is visible when it's in place.

 


Give it space
A door casing that is substantially narrower than the brickwork opening would normally require the difference making up by means of fiddly, timber make-up pieces or packing's.
However, given that timber plugs can be inserted at any length, does away with this process. For example, if you needed to make up 60mm, (the difference between the casing and the opening width), the six timber plugs that you have inserted could be cut down, so that they protrude 30mm at each side, creating an opening equal to the width of the casing, even though the actual opening is wider.
To do this, put a pencil mark onto the top plug, 30mm from the face of the brickwork.


Place the straight-edge onto this mark, ensuring that it also spans the two plugs below. Now 'plumb up' the straightedge by placing the spirit level on to it and mark the two lower plugs off its edge.
Next, measure from the mark on each plug, across on to the plugs opposite and place a mark to the exact width of the casing on to each one.
To double-check its accuracy, place the rigid door casing up to the marks to ensure that they all correspond. When you are satisfied that it is correct, proceed to cut each plug to length.
The other advantage of using timber plugs is that they can be used to correct brickwork error, brickwork that has been built  out of plumb.


The plugs, (as illustrated), have been cut to correspond to the straightedge which is plumb.  Notice that each plug is different in length, in this case, longest at the top and shorter at the bottom.



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