FAQ's

1. What is Hebel AAC?

Hebel AAC (Autoclaved Aerated Concrete) is defined as a lightweight product consisting of calcareous materials, such as cement and/or lime and siliceous fine materials, such as quartz sand and water to form a homogeneous cell structure. The cellular structure is attained by the inclusion of microscopic voids originating from a chemical reaction. Autoclaving is used for final curing of the material.

2. How long has HEBEL AAC been around?

The technology of producing building blocks from the natural raw materials quartz sand and lime has been around since the end of the 1800's. Around 1900, the process was improved by adding steam curing. This was the beginning of Hebel Autoclaved Aerated Concrete. Although HEBEL AAC was already being produced at the beginning of last century, improvements in the manufacturing process have led to the superior HEBEL AAC we know today.

3. What are some of the benefits of HEBEL AAC?

Among others, the main benefits of HEBEL AAC construction are: Fire Resistance, Durability, Thermal Performance, Acoustic Insulation, Pest Resistance, Precision, Speed and Ease of Construction, Structural Versatility, Light Weight, Workability, Non-Toxic and Environmentally Friendly.

4. What is the Hebel Building System?

The Hebel Building System includes masonry components like blocks, floor and roof panels, wall panels and lintels made out of HEBEL AAC.

5. How do I obtain information on Hebel AAC and the Hebel Building System?

Technical and design information as well as general information on Hebel AAC and the Hebel Building System can be viewed, downloaded and printed from our web site. Additional information can be obtained from our main office in the United States located in San Antonio, Texas by calling our toll free number at 1 877 41 HEBEL (1 877 41 43235) or via Email at hebel-usa@xella.com

6. Do you have a list of architects, engineers, contractors, installers, etc. familiar with Hebel AAC construction that I can contact?

 Yes. We can provide you with a list of companies familiar with Hebel AAC construction for you to contact. The list includes architects, engineers, contractors, installers, suppliers of finishes, tools, fasteners and equipment for Hebel AAC construction.

7. What kind of fire resistance values does Hebel AAC provide and where can I find this information?

Up to a four-hour Underwriters Laboratories, Inc. (UL) fire rating can be achieved. For detail information please refer to our web site. Actual UL fire test reports can be viewed, downloaded and printed from our web site

8. Are there any safety precautions I need to be aware when handling and cutting Hebel AAC?

Dust masks and eye protection must be used when cutting Hebel AAC or during any other dust generating operation. Dust could also irritate unprotected skin therefore the use of gloves and long sleeved clothes is recommended. Refer to Hebel Material Safety Data Sheets (MSDS) for more information. Please also check with Hebel Technical Department before cutting or modifying in any way Hebel AAC reinforced products like floor, roof and wall panels

9. Can I install Hebel AAC masonry units in cold weather?

Hebel AAC masonry units are to be install when the temperature of the surrounding air is 40° F ambient and temperature is rising. Placing Hebel AAC masonry units when temperature has dropped below 40° F and temperature of Hebel AAC masonry units is below 40° F is not recommend unless approved precautionary measures have been taken.

10. What are the typical installation tolerances on the installation of Hebel AAC masonry units?

Maximum variation from plumb: 1/4" in 10'-0"; not exceeding 3/8" in 20'-0" Maximum variation from level: 1/4" in 20'-0"; not exceeding 1/2" in 40'-0" or more.
Maximum variation in linear building line from location indicated: 1/4" in 20'-0".

11. Do I need to waterproof Hebel AAC?

Yes. A finish coat of a breathable stucco and paint needs to be applied. For more information on approved finishes please refer to our web site for links to the manufacturers.