SS400 Ice and Water Armor is a self-adhering, polymer-modified
bitumen roof underlayment reinforced with a fiberglass mat. The
underlayment is for use under asphalt shingles and reportedly
adheres to concrete, plywood, wood composition board and gypsum
sheathing decks. SS400 Ice and Water Armor is said to self-seal
around nails and be effective in valleys, ridges, coping joints,
skylights, chimneys, vent stacks, dormers, low-slope sections and
A 2-square roll of SS400 Ice and Water...
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