1. How much mixed material is needed to complete a floor screed 5.000 m long by 4.000 m wide and 0.050 m thick?
0.25 m3
0.5 m3
1 m3
1.5 m3
2. Tools and equipment for floor screeding will generally include:
sweeping brush, trowel, float, mixer, shovel
splash brush, small tool, gauger, trowel, float
spirit level, trowel, buckets, mixer, float
levelling equipment, trowel, float, shovel buckets, mixer
Plastic sheeting below the structural floor is the:
damp proof membrane
vapour barrier
moisture trap
aid to curing the floor
The type of cement used in floor screeds is:
Masonry Portland
Extra Portland
Rapid Portland
Ordinary Portland
Sands used for floor screeding:
should contain a high proportion of fine grains
should contain a high proportion of large grains
can be any type
should be sharp and well graded
Ready-mixed screeds are:
prepared off site and delivered as required
prepared after work for the following day
prepared in the morning for use during the day
used only for self-levelling floors
Screed rails or battens are used to:
help delivery of screed material to the workstation
assist in forming the main area of floor
tamp down the surface of the screed
form channels for drainage
The purpose of a damp proof membrane is to:
assist the passage of moisture
assist in the curing process
allow the screed to dry out quickly
prevent the passage of moisture
Cracking of large area floors may be reduced by:
use of more cement
use of expansion strips
adding more sand
a self-levelling compound
Battens used as a guide for screeds may be:
set out from datum lines
laid at 50 mm depth
set out from base floor
laid to form 75 mm depth
The most accurate proportioning of floor screeding materials:
is by weight
is important near heavily trafficked areas
can be carried out using shovels
can be carried out using buckets
The correct consistency for floor screeding materials is:
as dry as possible
slurry like
semi wet
semi dry
Mixing of screed material:
does not have to be thorough as it will be spread by shovel
needs to be consistent or wear will take place
should be carried out as slowly as possible
can take place after water has been added
Compacting screeds results in a:
lightweight screed
quicker set screed
more dense screed
slower set screed
Compacting can be carried out with a:
screed rail
datum
rule or float
level
High volumes of ventilation:
will aid the setting process
will not affect the screeds after laying
will allow the cement to harden quickly
may make the surface of the screed dusty
The finish on a floor screed:
is not important as it will all be covered up
is important as it may show through the final covering
can be completed the next day
can be completed by the floor layer with the finish
Laying polythene sheet on the floor screed after laying will:
act as an accelerator to the set
produce an even surface
allow the cement to set naturally
keep the floor soft for the next process
The purpose of curing is to:
allow the cement to set and harden over a long period
produce a lightweight screed
aid compaction to take place
Where drainage outlets are fitted:
the floor must be laid from this point
they can be repositioned later
the floor can be altered to fit when finish is applied
the drainage contractor will alter them to suit
