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The National Archives logo

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Thick or over-sized files 
files between 
4 and 5 cm thick

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If a file is between 4 and 5 cm thick,

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it will need to be split 
if the contents 
will make the file unwieldy or unstable.

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Check the file to see what additions have 
been used or are needed.

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If the file has a large number of polyester 
enclosures,

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this makes the file bulky and very slippery, 
so it is unstable.

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If the file has a large number of acid-free 
envelopes,

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this makes the file very bulky and unwieldy.

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In either of these cases,

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the file should be split into 2 similar thickness 
files.

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To split the file,

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find a sensible place at which you can split 
the file
into 2 similar thickness files.

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A sensible place is between 2 documents,

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rather than in the middle of a document.

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Remove the contents from the second half 
of the file,

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and put these into a new 4-flap folder.

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More details are given in the later section 
on 'Labelling split files'.

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If there are very few or no enclosures or 
envelopes,

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and the file is in good condition,

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the file can be left as a single file,

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but a 15cm tag must be used, as shown in 
this table.

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The image indicates the excess tag length 
needed

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to ensure the file can be opened, and pages 
can be turned easily,

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without damaging either the file or the records.

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More details are given on tagging in a later 
video.