This advantage of spray foam insulation comes from its superior ability to provide continuity over the many imperfections and discontinuities that characterize most wall assemblies. And, as anyone who has ever been in an attic can attest, this applies doubly to attics, which have been subjected over the years to the elements. Spray foam insulation can spread evenly over irregular walls, corners, gaps, masonry ties, equipment penetrations, nail protrusions, ductwork and plumbing.
It also has the incidental benefit of creating a sound barrier and substantially reducing airborne sound transfer through the building’s roof, floor and walls.
Your home is aging – and so is your insulation. Traditional insulation in bags, panels or seals can sag and lose its seal. This allows air to flow through more easily, with the obvious negative effect on your energy bills. It should be removed.
But removing the old and inefficient insulation from your attic is not just about saving money. The presence of rodents, foul odor and leakage are other reasons to remove insulation. Old insulation may contain vermiculite or fiberglass, both of which can pose health risks. Faulty insulation can become a haven for moisture – and create conditions for the growth of mold and mildew. In the summer, moist air in the attic can affect your roof sheathing and cause shingles to deteriorate. In the winter, heat loss in an attic melts snow, which can form ice dams at the roof edge. Water can back up under shingles, damage to structure of the roof and, at the very least, result in interior leaks.