Advantages of RAWMAT® HDB » Vs. Bituminous Membranes
RAWMAT® HDB is a fundamental breakthrough in barrier technology, and leaves the factory as a complete, functioning system.
The following table explains the advantages of RAWMAT® HDB over Bituminous Membranes in more detail.
| Bituminous Membranes | RAWMAT® HDB |
|---|---|
| Requires a smooth oversite blinding prior to application. | RAWMAT® HDB can be laid directly onto a compacted sub-base, often no oversite blinding required. |
| Cannot be laid in the rain or to damp surfaces. | RAWMAT® HDB can be laid in any weather and onto wet concrete or other surfaces. |
| Labour intensive requiring skilled installers. | RAWMAT® HDB can be laid quickly and easily by unskilled labour. |
| Overlaps need extra care & are weakest point of system. | RAWMAT® HDB forms self sealing overlaps, no welding, tapes or rolling require to seal joints. |
| Requires the application of priming coat before application. | No primers are required, can be laid/fixed to green concrete. |
| After initial bond, peels from structure, leaving passage for liquid. | Bentonite bonds permenantly to the structure, no possibility of tracking. |
| Require the addition of protection boards. | In most applications no need for protection boards. |
| Self-adhesive so only one chance to install correctly. | Until concreting/backfilling RAWMAT® HDB can be re-positioned or replaced. |
| Cannot self-heal if punctured. | RAWMAT® HDB will self-seal to punctures. |
| Bituminous membranes break down in the presence of hydrocarbons. | Due to the liquid polymer hydration RAWMAT® HDB does not breakdown through cation exchange. |
| Complex to repair if damaged during installation. | RAWMAT® HDB is simple to repair; simply cover damaged area with an off-cut to patch over damage. |
| Passive system, tears & ruptures if the structure moves. | RAWMAT® HDB is an "intelligent system" which can withstand movement within the structure. |
| Limited life time - usually only 30 years maximum. | RAWMAT® HDB is a natural material which will function for the life of the building to which it is applied. |
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All information contained within this site is given in good faith and is correct to the best of Rawell Environmental Ltd.'s knowledge. However, this information is not legally binding and may be changed at any time without notice. Rawell offer a free advisory service, please Contact Us for more details. RAWMAT® and RAWSEAL® are registered trademarks of Rawell Environmental Ltd.