1. When we are using the primer, why should we
do surface preparation very thoroughly? Primer should work as good bonding
agent in between.
Primer applied on the non-prepared surface, primer will stick to the
contaminants. But this does not mean that the contaminants will remain bonded
to the surface. Hence, the subsequent applied material will bond to the
contaminants at the bottom and contaminants leaves the surface.
2. Need to create the slope (Avg 2-5mm thick)
over the waterproofing coating which is 1.2mm thick. Can we use cement slurry?
Generally waterproofing membranes are flexible as they must be
stretchable to bridge the crack.
Cement slurry which will become rigid after drying will have low
tensile strength, applied on waterproofing membranes, it will crack. Hence, it
is recommended to apply any flexible levelling compound over the waterproofing
membranes. This type of flexible levelling compounds will have more tensile
strength and will not crack.
In case, if the thickness of sloping material is high say min 15mm,
then it can be done with Cement sand mortar with/without admixed with admixture
say, integral/crystalline/SBR, etc.
3. Why we cannot use any primer
/ sealer for any toping material, as all primer and sealer will seal the porosity
of the surface and provide the clean surface?
Primer and sealer are not same by function and by the chemistry.
Primers, seals the surface, supress the fine dust (up to certain limit), bonds
to the surface chemical/mechanically, provides chemically compatible surface
for toping material. Whereas sealers, seals the surface, provides different
look to the surface, provides breathability to the surface (some sealers only)
and in most cases they do not gives compatible surface to the other toping
materials.
Manufacturer designs the chemistry of the primer according the system.
So, it is not good for client or to an applicator to re-design the system and
test.
4. Moisture testing is
necessary for the old and visible dry floors/walls?
There are 2 types of moisture in the structure. Surface moisture and
the rising moisture. Moisture which is on the surface is surface moisture. Moisture
in the matrix of the substrate but may/may not be on surface is supressed
moisture and this may rise to the surface anytime, so it is called as rising moisture.
Sometimes moisture may rise to the surface from the water sources like, pond,
garden, river, water pipe leakage, etc., hence this is also called as rising moisture.
Surface moisture and moisture from the water pipe line leakage may be
at any floor level of the structure. Whereas, rising moisture will be at the
floor which is next to the soil or below soil level.
Considering the both situation, it is always suggested to the moisture
test at least by plastic sheet method Or simple apply (DPM) Damp Proof Membrane.
For more accuracy, you can use electronic moisture testing instruments
for surface moisture test and deep moisture test. For more details on moisture
testing, refer: https://annayyachandrashekar.blogspot.com/2017/09/moisture-testing.html
5. Client and applicator says
there is problem in the product. Applicator says, he is using our product and
similar other’s product since many years and not seen this type of problem.
Whenever the problem rises at site level, it is obvious that everyone
put blame on the product sometimes the sales officers of the manufacturer also.
Here, everyone should know that all manufacturer has some set of rules to be
followed before production and the stores department releases the product to
the market. Once the technical team and R&D, finalize the product,
production department produces the product and pack it. Technical team, randomly
pick the packed product and conduct the testing. After passing all the test,
product will be approved to handover to the stores department. Products will be
manufactured in tons together in batch wise. These products will be dispatched
to the end users as per request.
Let us assume, that there is a complaint in the product, then this
should be reported from all the places where product has been sent. How comes,
only one site or two sites will have the problem?
Other than this, it is necessary to observe the site condition and the
site work procedure where there are multiple peoples will be working with their
own set of rules and knowledge under different site condition.
For still more problems before application, while application and
after application, please refer to:
As per the time line, we try to keep this data updated.
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