This document provides a step-by-step methodology for waterproofing roofs with Crown Izonil. The process involves: 1) Surface preparation through cleaning and crack treatment, 2) Applying cement slurry and the first layer of Crown Izonil, 3) Inserting a glass fiber mesh between the first and second Izonil layers, 4) Applying the second Izonil layer, 5) Curing with polythene sheets for 7 days, and 6) Optionally adding a protective coating. Fiberglass mesh reinforces the plaster layers, protects against cracking, and improves mechanical strength in a cost-effective manner.

1. Work Methodology of
Waterproofing In Roof
with Crown Izonil
Md.Jayadul Islam
Executive (Technical ), Crown Izonil
M.I.Cement Factory Ltd.

2. pg. 1
FLOW DIAGRAM OF CROWN IZONIL ROOF WATER PROOF TREATMENT WORK
Work Process
Surface Preparation
Cleaning all
loose particles
Let it dry for 48 hours & Check for Leakage
Crack Treatment
Apply one layer of Cement Slurry (Grouting)
Application of Crown Izonil waterproof plaster laying on the roof slab surface in
two layer and glass fiber mesh will be placed in between two layers like sandwich
Curing
Open the Crack line by V
shape groove cutting
Seal the groove by polymer
modify concrete
Chipping the
Surface
Washing the
surface
Cleaning all
loose particles
Protection Layer
Removable of Old Patent Stone/Lime terracing

3. pg. 2
Roof Waterproof Treatment Work
Step-1:
REMOVABLE OF OLD PLASTER/LIME TERRACING :
It is important to remove all existing patent stone, CC casting plaster, Brick Bat Coba & lime
terracing from the RCC roof surface (Mather Slab)
SURFACE PREPARATION:
It is important to remove all existing plaster, stucco, loose particles, residual paint, oil, rust,
dust, and other impurities. Chipping Machine or with Required Equipment as required at the
site and as per the condition.
The RCC surface should be thoroughly cleaned water, or wire brush. The surface should be
well moistened with water before application.
Washing the surface with Water.
Blowing the Fine Loose Particles with a Blower.
Chipping the Surface Chipping the surface

4. pg. 3
Cleaning Cleaning
Wash the surface

5. pg. 4
Step-2:
CRACK TREATMENT :
Identify the Crack line on roof slab than open the Crack line on roof slab by V shape groove
cutting and cleaning all loose particles than seal the groove by polymer modify concrete.
Identify the Crack V Shape groove cutting
V Shape groove Cutting V Shape groove Cutting

6. pg. 5
Cleaning & Bonding Agent apply Seal the groove by polymer modify concrete
Step-3:
APPLY CEMENT SLURRY (GROUTING) :
The surface should be wet before application of Izonil.
Cement grout has to be done before application of Izonil.
Applying Cement Slurry

7. pg. 6
Step-4:
Applying Izonil :
The surface should be wet before application of Izonil.
Mixing : Izonil : Sand : Water = 1: 2.4 : 13 Liter
25Kg Izonil : Sand 60Kg: Water 13 Liter
Weighing Mixing by using electric hand mixer machine
Apply 1st
Layer of Izonil :
 Providing and applying one layer of Crown Izonil, 100% Waterproof, hydrophobic,
breathable and drying plaster, at an average thickness of 8 to 10mm layer.

8. pg. 7
Applying 1st
layer of Izonil
Insert Glass Fiber Mesh (10mm X 10mm):
 Insert Glass Fiber Mesh on 1st
layer of Izonil like sandwich.
 Overlapping of mesh should be followed strictly.( Lapping 4 inch)
 Slopping has to be maintained between two joints of Izonil.
 Required gradient is provided towards drain point. (1/72)
 Every Joint has to be covered with izonil including fiberglass mesh.( With required
measurement)
** For better application of fiberglass mesh don’t apply 1st
layer of Izonil wider than
1100mm ( 3.6ft).

9. pg. 8
Inserted fiberglass Mesh Applying Mesh
Apply 2nd
Layer of Izonil :
 Providing and applying another of Crown Izonil, 100% Waterproof, hydrophobic, breathable
and drying plaster, at an average thickness of 8 to 10mm layer.
Applying 2nd
Layer of Izonil Finishing Layer (2nd
Layer) of Izonil

10. pg. 9
Step-5:
CURING :
 Immediately polythene sheet has to be provided on Izonil plaster because of its dry
condition.
 Ponds are to be made for Curing and Checking for Any leakages
 The plaster has to be cured for minimum of 7 days.
Curing

11. pg. 10
Methodology for Protection Coat or Leveling Screed on the Roof.
1. Clean all the Loose Particles that have been settled on the Izonil Layer and check
that Izonil Layer should not be damaged.
2. Wash it water once and Clean it
3. The levels are to be marked as per the required gradient on the Parapet walls.
4. Check that the entire exit Holes are properly packed.
5. The ratios for the above screed may be as per the Specification of the client/
Structural Designer.
6. Before laying the screed cement Slurry applied on the Izonil Layer.
7. Complete the protection layer and Start curing it once the Finger Impressions are
found on it.
8. Ponds are to be made for Curing.
Fig : 17 : Preparation for Protection Layer

12. pg. 11
Fig-18 : Applying Protection Layer Fig -19 : Finishing & Curing
Technical Features:
-7 times per day)
laster: < 1 mm
needed for 3days otherwise there are possibilities of cracking.
(Thickness 10mm)
Keep it cool & dry place

13. pg. 12
Fiberglass mesh protects plaster layer surface from cracking
Fiberglass mesh is cheap material that does not burn and is characterized by both low weight
and high strength. These properties allow it to be successfully used in the formation of plaster
facades, as well as use on internal wall and ceiling surfaces. This material is widely used for
fastening the surface layer at the corners of the room.
Most widely used standard fiberglass plater mesh is the density of 90g/m2
and 165g/m2
for
exterior cladding and facade work. Resistant to alkalis, does not decompose and will not rust
over time, it does not emit toxic and harmful substances, has a high resistance to tearing and
stretching, protects the surface from cracking and improves its mechanical strength. Easy to
handle and use.
Images of Fiberglass Mesh
F-01: 10mm mesh size fiberglass

14. pg. 13
F-02: Plaster fiberglass mesh protects the wall surface from cracking and improves its
mechanical strength.
F-3: Fiberglass mesh as reinforcing mesh for plaster work is easy to handle and use.
Application of plaster fiberglass mesh
 Fiberglass mesh is used to strengthen the surface of the plaster layer all kinds of
buildings.
 This mesh reinforced liquid waterproofing layers slabs and roofs.
 Fiberglass mesh used to impart mechanical strength filler floor coverings that are
different self-leveling properties.
 Application of glass fiber mesh contributes to strengthening plaster, and the bases used
for laying ceramic tiles.
Benefits plaster reinforcing mesh:
 Resistant to alkalis;
 Does not decompose and will not rust over time;
 Does not emit toxic and hazardous substances;
 Helps to overcome stress caused by sudden changes in temperature and humidity;
 Has a high resistance to tearing and stretching;
 Protects the surface from cracking and improves its mechanical strength;
 Plaster mesh is easy to handle and use.