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. What tile adhesive shall be
used on waterproofing coating? All adhesives should work. Even on polyurethane
coating?
This doubt is very simple, but the answer is in chemistry of the
product. All waterproofing coatings works for one goal and that is
waterproofing the surface but chemically they are/may be different. For
examples, Acrylic, cementitious acrylic, SBR based, Integral based, Crystalline
based – these are good compatible with cementitious tile adhesive. Some type of
waterproofing membrane like, polyurea, polyurethane, urethane is very different
from the previous ones. These are made up of very close linked polymer
structure, hence they form vert tight surface which will not allow subsequent
material to bond by mechanically and even not by chemically. So, we have 2
options, first to ask the manufacturer that which adhesive is compatible and
the second is to conduct the Pull-Off test at site level and take a joint
decision along with client.
3. 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.
4. Vitrified tiles installed
using Pre-mixed adhesive over the waterproofing coating is failed. Then, how
can you say tile adhesive will work in this case?
Before we get in the answer, first let us understand how Pre-mixed
adhesive and adhesive works differently.
Pre-mixed adhesive means formulated powder mixed with formulated
liquid, supplied in air tight product. When you apply this adhesive, it starts
de-hydration, liquid part evaporates, material get hard as tile bed bonding
with the tile bottom and the surface. Tiles adhesive are supplied in the powder
form, needs to mix with water and then applied. Polymer/chemical will hold the
water, chemical utilizes while reaction and forms hard tile bed bonding between
the tile bottom and the surface.
In this case, client used Premixed adhesive to install the vitrified
tile which are impermeable, over the waterproofing coating which is also
impermeable, then where is the way to liquid to evaporate? Adhesive remains
wet, does not dry almost same as the air-tight bag. So, it will not get hard,
not create the bond with tile or with the surface. In case if client use tile
adhesive, tile adhesive does not need space to evaporate the water, it will use
the water in chemical reaction, dries, get hard, achieve good bond with tile
and surface.
5. 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.
6. 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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