.OPC comes in form of small bags and sand must be bought in huge quantity, which extensively occupy storage areas. OPC and sand must be relocated to another area for mixing and the process is dirty and dusty. Tiles need to be soaked in water for at least one day before being laid with sand-cement, and this is time consuming.

To lay tiles with sand-cement traditional way is to apply the mixture of sand-cement in lump on tiles' back so it has to be done with one tile at a time.

Without additive to help retaining water, mixture of sand-cement dries fast and then causes the difficulty to adjust the tiles after being laid. This leads to aesthetic problem of the line of tiles and also poor bonding strength, which will be the reason of de-bonded tiles later. Laying tiles traditional way by applying sand-cement mixture in lump at tiles' back will create voids underneath the tiles and water can seep through. This creates white stain problem. Moreover, tile will be fragile at the area without any adhesive underneath.

Poor bonding strength of sand-cement mixture causes by dirt in the sand and uncertain proportion of the mixture. Besides, there are limitations to use the mixture for laying following tiles in the following conditions.

• Low absorbent tiles
• Granito with 60 x 60 cm or greater size
• Glass mosaics - On polished substrates
• On existing tiles
• On substrates where subject to movement
• On the areas with high pressure and impact

Thick layer of sand-cement mixture must be used to lay tile traditionally in lump and/or to adjust the floor level, in order to gain its bonding mechanism. There will then be more loads onto structure. Moreover, there will be material wastage since the mixture dries faster than the application.

It's very easy to use tile adhesive, it will be already ready to use after just mixing with water. Bagging product makes it convenient for transportation process, providing low dust and clean working space. Tiles are not needed to be soaked, just un-box them and lay.

Notched trowel is normally and efficiently used to apply the mixture of tile adhesive on the area of about 1 m2. Tiles are then continuously laid onto notched adhesive and quickly adjusted into the lines.

0ptimum setting time of tile adhesive allows tiles to be easily adjusted within a certain period of time. It makes tiles being laid in line and gives the aesthetic final look. Applying tile adhesive with notched trowel provides full spread on back of tiles and will reduce many problems like broken tiles esp. on the corner, water seeping, and stain or efflorescent. Full contact of the adhesive on tiles' back and substrate provides strong bonding strength and long lasting tiling work.

Tile adhesives are formulated according to specific applications such as to lay tiles, glass mosaics, large-size granito (up from 60 x 60 cm), to lay tiles on polished substrates, on dry wall system, on existing tiles without removing them, on external areas, parking areas, industrial areas, in swimming pools, and many more.

Laying tiles by using tile adhesive with notched trowel requires less amount of material. Adhesive layer is a lot thinner than the mixture of sand-cement, and this leads to lighter load to building structure. A bag of 20 kg tile adhesive can be used to lay tiles on the average area of 4 - 5 m2. A bag of 25 kg tile adhesive can be used to lay tiles on the average of 6 - 7 m2.

Area coverage depends on substrate smoothness, working tools, and skill of tilers.