Sometimes members of the starling family have historically been called grackles. Tristram's starling is sometimes known as Tristram's grackle, and the hill mynas in the genus Gracula have also been called grackles.ometimes members of the starling family have historically been called grackles. Tristram's starling is sometimes known as Tristram's grackle, and the hill mynas in the genus Gracula have also been called grackles.
Waterproofing an old limestone foundation from the exterior with âClosed Cellâ spray polyurethane foam provides a water tight seal from the outside.
Cost Of Spray Foam Insulation. Spray foam is available in two different types: open-cell spray foam which is usually $0.44 to $0.65 per board foot and closed-cell spray foam which is about $0.70 to $1 per board foot. The average cost to have spray foam professionally installed is about $1,728.-values measure the resistance of insulation to heat. The higher the R-value, the more effective it will be against bugs, cold air and so on. Spray foam insulation has an R-value of around R-5 to R-6. This is because it has polyurethane in its composition.