Waterproofing HEBEL / AAC – Autoclaved aerated concrete

Waterproofing Hebel is absolutely critical. Especially below grade to prevent early degradation of the AAC.  Maxseal coatings produce a decorative waterproof finish on AAC. DIY or a professional can produce the desired effects.  Maxseal offers both cost effective and economical for the protection of autoclaved aerated concrete.

waterproof-hebel-aac-blocks, Waterproofing HEBELHow to use Drizoro Materials for Waterproofing HEBEL

The Drizoro products required for the waterproofing HEBEL blocks and panels are


Treatment for Previously Coated HEBEL Surfaces

1. Remove all render, paint or other material from the substrate. (On previously painted surfaces. Remove all paint and delaminating material)  Apply MAXSEAL FLEX as per TECHNICAL BULLETIN Nº.:29.06 

2. All joints must be sealed with MAXSEAL FLEX with the incorporation of MAXMESH in the first coat.


3. Surface area to be coated must be primed first with a coat of MAXSEAL FOUNDATION this will seal the surface in preparation for finish coats. Wet the surface before applying a prime coat. AAC is highly porous. Therefore saturation with water before the application is necessary. MAXSEAL FOUNDATION to be applied as per TECHNICAL BULLETIN Nº.: 08.00

Treatment of Vertical  Hebel Surfaces

4. For the sealing of walls, it is recommended that MAXQUICK ROLL is applied to the surface in a single coat application as per TECHNICAL BULLETIN Nº 88.01. MAXQUICK ROLL is not to be used in the situation of water containment.

How I showed that Drizoro Maxseal will not Delaminate from the Hebel Blocks.

Hebel’s representative on the Gold Coast told me that Drizoro products would not adhere as they do on other masonry surfaces. The suggestion was that it would take an engineers report to prove Maxseal could adhere to Hebel.  Therefore it was my job to convince all that Maxseal adhered to Hebel panels and blocks. The Hebel Agent didn’t believe that Maxseal could adhere to Hebel as it did to a normal masonry block.

The test was simple – take an ordinary Hebel block cut it in half then mix Drizoro Maxseal Foundation (could have been Maxseal White or Gray & still have the same result) according to application details.
Place the Drizoro Maxseal Foundation between the 2 halves of the Hebel block & place another block on top & leave 24 hours to cure.
Then cut the joined Hebel block into 2 cm square pieces and test to see where the fracture occurred when breaking apart the joined Hebel
Result: – After just 24 hours of curing, the samples when broken apart was about 50% through the Maxseal  & 50% through the Hebel block itself
– From 48 hours of the Maxseal cure, the break in the seal was always 100% delamination of the Hebel Block

Conclusion: – Hebel block will delaminate from itself before the Drizoro Maxseal Delaminates from the Hebel and as such is suitable as a waterproofing membrane.

Further to the above analysis and conclusions

CSR Hebel conducted in house testing, by Quality Services Laboratory – Somersby NSW,  for BOND STRENGTH. The test used is known as Bond Wrench Test and 2 of Drizoro products were tested and shown to bond sufficiently.

  1. Drizoro Maxquick Roll – decorative, waterproof coating 
  2. Drizoro Maxseal Super comes in White n Grey

For the technically minded please find the report 27.01CSR wrench Report.pdf

hebel-to-waterproof, Waterproofing HEBEL

Waterproofing Hebel or autoclaved aerated concrete in video format

Advantages and Disadvantages of Aerated Concrete












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