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 Block Jointing MortarHome / Products / Block Jointing Mortar

Ecorex Thin BED Mortar is a high strength adhesive for quick and firm laying of AAC block with thin joints. It is a factory mixed mortar made up of cement, graded sand and blended with polymers to impart high strength and water retention properties even when in thickness of 2-3mm layer.

When you choose to use Block Jointing Mortar, you can enjoy a host of distinct benefits.

High Bond Strength

Special polymers imparts high adhesive strength increasing overall masonry strength & load-bearing capacity.

No Shrinkage Cracks

Water is retained in mortar, thus preventing shrinkage cracks

High Thermal Insulation

Thin joints prevents heat transfer through walls.

Zero Wastage

It is easy to apply and avoids wastage of material.

High Coverage

Due to low density & high volume, it can cover 180-200sq. ft. with 3 mm thickness for 4" thick AAC Block.

No Curing Required

Due to water retention polymers, curing is not essential after application


Quantity of Ecorex Thin BED Mortar required is 3 time lesser than conventional mortar.


No job site blending of cement & sand is required, only water is to be added.

 Preparation and Application

Mortar Mixing

In a clean bucket, mix Ecorex block jointing mortar in 25-30 % of water.

Mixing By Mixer Or Tool

Mix first for 5-10 minutes by electrical mixer to mix homogeneously.

Reaction Time

Allow mortar to stand for 5 minutes.

Mortar Remixing

Mix again for 2-3 minutes. Now thin bed mortar is ready to use.

Clean Surface

Before application clean the surface of blocks using suitable tools like brush so that any foreign material is not held on the blocks.

Wet Surface

Wet the surface of blocks before applying mortar.

Mortar Spread

Mortar should be spread on all sides of block in such a way to maintain the bond thickness 2-3 mm.


Use Spirit Level and fibre hammer to remove any air gaps in between blocks for proper jointing and alignment.


Do not disturb the wall after application of mortar for at least 24 hours.

Setting Time

The setting time is affected by climatic conditions, allow stand-alone time accordingly.

 Notes on Application / limitation

  • Cementitious substrates must be atleast 28 day sold.
  • Do not exceed the recommended water dosage. Apply only to sound, prepared substrates. Do not exceed the maximum layer thickness.
  • Protect freshly applied material from freezing and rain etc.

 Value Base

All technical data stated in this product data sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control.

 Health and Safety Information

For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent material safety Data Sheet containing physical, ecological, toxicological and other safety related data.

 Legal Notes

The information and in particular, there commendations relating to the application and end use of Ecorex products are given in good faith, based on our current knowledge and experience of product when properly stored, handled and applied under normal conditions in accordance with recommendations. In practice the difference in material substrates and actual site conditions are such that no warranty in respect of merchant ability or fitness for the particular purpose, no any liability arising out of any legal relationship whatsoever can be inferred either from this information or from any written recommendations or from any other advice offered. The user of product must test the products suitability for the intended application and purpose. Ecorex reser ves the right to change the properties of its product. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sales and delivery. Users must always refer to the most recent issue of the local product data sheet for the product concerned, copies of which will be applied on the request.

Block Jointing Mortar : Technical Datasheet
S.No. Parameters Values
1 Splitting tensile strength (to measure the adhesion between two AAC blocks as per ASTM method) ≥0.34 N/mm2
2 Compressive strength of mortar @ 28 days ≥ 5 N/mm2
3 Maximum particle size 1mm
4 Workability using standard flow table Silt content in sand 170-180 mm with 28 % of water at 27°C
5 Silt Content in Sand < 1.0
5 Bulk Density 1650 - 1700 KG/ m3 (in standard testing conditions without viberations)

Block Jointing Mortar : Characteristics
S.No. Parameters Values
1 Physical nature Free flowing and grey in color
2 Water demand for ease in application 25-30 % (by weight)
3 Hard Dry 24 hours (further depending on temperature and humidity condition)
4 Pot life Approx. 30 minute
5 Mortar required for jointing of two blocks of 650 mm length and 150 mm thickness 500-600 gm @ 2-3 mm thickness and 25-30 % of water by wt.
6 Surface area covered by 40 Kg bag 170 sq.ft.(considering joint thickness of 2-3 mm)
7 Consistency (ease in spread) 170 - 180 mm*
8 Efflorescence Negligible

Block Jointing Mortar : Coverage Chart
S.No. Size (mm) Jointing Surface area of 1 block (Sq. Ft.) Mortar required in Kg / Block (170 - Sq.Ft/40 KG) Blocks required for 100 Sqt. Feet Jointing mortar in KG required for 100 Sq. Ft.
1 600 x 200 x 100 1.72 0.41 77.42 31.74
2 600 x 200 x 125 2.15 0.51 77.42 39.48
3 600 x 200 x 150 2.58 0.61 77.42 47.23
4 600 x 200 x 200 3.44 0.82 77.42 63.48
5 600 x 200 x 225 3.88 0.92 77.42 71.23

Block Jointing Mortar : Properties
Parameters Specification
Appearance Grey Powder
Water Required 35%
Pot Life ~ 1.5 - 2 hrs
Curing Not required
Tensile Adhesive Strength > 0.34 MPa (as per ASTM-C1660)
Coverage 180-200 sq.ft. (for 4" thick block)

Block Jointing Mortar : Comparison
Ecorex Mortar Conventional Mortar
Approx. Rs. 365/- for each CuM For 1:4 ratio
Cement @ Rs. 4.2/- 90 kgs = Rs. 378
Sand @ Rs. 15/- 8.5 CFT = Rs. 128
Total Cost Per CuM = Rs. 506
Fast Application Not Possible
Plastering Possible after 24 hours. Curing not required Minimum 7 days curing required
Consistent quality due to computerized mixing and tested raw material Manual mixing and not possible to test every batch
Higher Bond Strength than Conventional Mortar Not possible due to difference in properties of blocks and mortar
Negligible Shrinkage Cracks More shrinkage crakes
Easy Handling and Storage Difficult to keep stock of different components and high wastage