Mercantile buildings - These shall
include any building or part of a building which is used as shops, stores ,
market , for display and sale of merchandise either wholesale or retail.
Mumti - A structure with a covering roof over a staircase and its
landing built to enclose only the stairs for the purpose of providing
protection from weather and not used for human habitation.
Mezzanine floor - An intermediate floor between two floor levels
aqbove ground floor and at least one side of it should form an integral part
of space floor /below.
Manhole - These are the masonry chambers provided at suitable
location and on the line of the sewer for the purposes of inspection and
cleaning the sewers.
Mansard Truss - This truss is now rarely constructed. This truss has
two pitches , the lower varying from 60 degrees to 70 degrees and the upper
from 30 degrees to 40 degrees. This truss is more or less a combination of
king post and queen post trusses.
Mortar - It is usually a mixture of cement and sand or lime and
sand , or a mixture of three. It not only acts as a cementing material but
also imparts strength to the work by holding the individual bricks together
to act as a homogeneous mass.
Measurement of Cement - Cement should always be measured by weight
and not by volume.
Measurement of Fine Aggregates - Fine aggregates i.e. sand is
normally measured by volume in case of ordinary works whereas in case of all
important projects , it is measured by weight.
Measurement of Coarse Aggregates - Coarse aggregate may be measured
either by volume (litres) or by weight. In case of wet aggregate , allowance
for surface water should be made while determining the quantity of water to
be used in the mix.
Measurement of Water - Water may be measured by weight or by
volume.
Mitre - It may be defined as a cut formed at the required corner by
cutting the corner of the sheet for a length of 15cm or the length of the
end lap whichever is more along the vertical edge and for a width equal to
the width of one corrugation along the horizontal edge of the sheet.
Mullion - It is the central member usually used in the revolving
doors , which is attached with ball-bearing at the bottom and bush bearing
at the top so as to enable the door to revolve smoothly without producing
jerks.
Mud Plastering - This type of plastering is commonly seen in kuccha
construction in villages and in other structures of temporary character.
This is the cheapest form of plastering.