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Insulating Underground Pipe and Ducting With Perlite Insulating Concrete
Prepared by: The Perlite Institute

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Left: Perlite concrete base pad used when earth has been disturbed.
Right: Base pad eliminated when earth is undisturbed or when it has been compacted.
When below grade water is present,the installation should be completely encased with a PVC membrane and vent drains installed.

Technical data given herein are from sources considered reliable, but no guarantee of accuracy can be made or liability assumed.  Your supplier may be able to provide you with more precise data.  Certain compositions or processes involving perlite may be the subject of patents.

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Updated:
14-Nov-2001

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