[TowerTalk] Galvi steel below ground

[Stan]

A number of comments have raised the issue of how to treat galvanized
steel below ground and NOT in concrete.

ROHN has a requirement in fine print...

ROHN Drawing B841300R10, Foundation Material Specs., Rev 10 dated
11/3/94

item 27 ( and I qoute verbatim)....

"For anchor block type foundations, the portion of the steel anchors,
from top of anchor block to ground level, shall be coated with bitumen.
Design assumes periodic inspections shall be performed over the life of
the structure to determine if additional anchor corrosion protection
measures must be implemented based on observed site -specific
conditions."



Bitumen is an asphaultic paint commonly found in the hardware or
building supply store as
roofing coating (un-fibered) and is a black and sticky tar coating...

Thus tar coating applied on all exposed galvanized steel below ground
level (grade) will prevent  erosion of the galvi (zinc) coating and
corrosion of the steel.

2 coats should provide 100% coverage.

I hope this sheds some light, on a fine point often missed......

Stan, WA1ECF   Cape Cod, MA    FN41sr







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