What type of finish is recommended for an underground foamglas installation?

For an underground Foamglas installation, using Pittwrap is recommended due to its specific properties that effectively protect the Foamglas insulation from potential damage in underground conditions. Pittwrap is a type of waterproofing membrane that provides a robust barrier against moisture and environmental stressors, which is crucial for maintaining the integrity and performance of the insulation when buried underground.

When Foamglas is installed, it is essential to shield it from water infiltration since prolonged exposure to moisture can compromise its insulation capabilities and lead to deterioration. Pittwrap ensures that the insulation remains dry and functional by preventing water penetration and protecting against soil pressure and debris.

The other options may not offer the same level of protection or compatibility with Foamglas for underground applications. For instance, while bitumen can provide certain protective qualities, it may not be as effective against moisture compared to a purpose-built product like Pittwrap. Similarly, plastic covers may not adhere properly or offer sufficient durability in harsh conditions, and concrete sealants can introduce challenges related to bonding and flexibility in an underground environment. Thus, Pittwrap stands out as the most suitable choice for ensuring long-lasting performance and protection for underground Foamglas insulation installations.