How to lay Hebel PowerBlocks

Step-by-step guide:

Use Hebel Mortar for the base course bed (a standard brickwork mortar mix is suitable).

Please note: the supporting structure is to be designed to full masonry standards by a practising engineer if building a Hebel PowerBlock wall.

Lay a damp proof course (DPC) slip joint membrane on thehorizontal surfaces where the Hebel® Blocks will be laid.

This will allow for differential movement between the blocks and footings.

Install the DPC prior to the application of the Hebel Mortar.

Lay Hebel Mortar to get the first course of blocks straightand level.

Brush all loose particles and dust from the base, top and ends of each Hebel PowerBlock to be laid.

Mix Hebel Adhesive using the directions on the bag.

Apply Hebel Adhesive to the end of the base block using a notched trowel that matches the block thickness.

Accurately position a Hebel PowerBlock horizontally and tap into place with a rubber mallet, ensuring the block is level in all places (Figure A).

Position the next Hebel PowerBlock adjacent to the first, and with a rubber mallet, gently tap the block end horizontally to fully close the vertical joint.

All joints (Step 1, Figure B) should be 2-3mm.

Now tap the second block down into the base mortar, making it level with the first block (Step 2, Figure B).

Repeat until the first course is complete

Second course

Each Hebel PowerBlock joint of the second course must overlap the joints of the first course by at least 100mm.

Apply Hebel Adhesive to the topside of the first course using a notched trowel that matches the block thickness.

Position the first block in the second course and gently tap accurately into place with a rubber mallet. All joints should be 2-3mm thick

Apply Hebel Adhesive to the end of the first Hebel PowerBlock.

Position the next block adjacent to the first, and with a rubber mallet, gently tap the block end horizontally to fully close the vertical joint (Step 3, Figure C).

Tap the top of the block until level with the previous blocks laid (Step 4, figure C).

Repeat for subsequent blocks.

Clean any excess adhesive off the block face at the end of each course, no longer than 1-2 hours after laying the first Hebel PowerBlock.

Large holes can be patched using Hebel Mortar.

Fig. 18.1
Fig. 18.2

Sand and render your project.

Materials required:

Shopping List


Tools Required


Safety information

As with all cementitious products, the user should take all precautions associated with cutting concrete. These precautions include: P1 or P2 class respirators (for fine dust from powered cutting tools), eye protection and ear protection, as well as long sleeved clothes and gloves, as dust could irritate the skin. Hebel recommends reading all relevant Material Safety Data Sheets (MSDS) prior to working with Hebel products.

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