Common Name: Low Density Bead Board
Colour: White and light blue with visible beads
Thermal Resistance: RSI - .025/mm R - 3.6 /in. Good
Cost: Medium
Fire Resistance: Poor. Gives off toxic gas
Fungus / Vermin Resistance: Fair
Limitations:
-- Must be covered. It is a fire hazard if exposed on the inside of the house and will deteriorate if exposed to the sun on the outside of the house.
-- Lowest strength of the rigid insulation: is easily damaged.
-- Will deteriorate if exposed to water for long periods of time.
-- Flies can live in it under the right conditions.
Advantages:
-- Best dollar value in resistance/$ for foam boards
-- Light, easy to handle and cut.
-- Available in a good variety of sizes.
-- Not a vapour barrier, so poses no condensation problems when applied to the outside of the house.
-- Can be glued directly to concrete or wood with proper adhesive.
Applications:
-- Inside foundation walls, outside upper wall framing under siding, roofs.
-- I do not recommend using it underground, because it absorbs moisture and can deteriorate.