Cellulose is often pitched as the "eco-friendly" alternative to fiberglass because it is made of recycled newspaper. While it provides excellent early thermal protection and superior sound deadening, its long-term performance in humid climates like Dallas-Fort Worth is heavily debated among engineers. Let's break down the data.
The Strengths
- + Higher Initial R-Value: Cellulose sits at about R-3.2 to R-3.8 per inch, slightly beating standard blown fiberglass.
- + Soundproofing: Because it is physically heavier and denser than fiberglass, it acts as a massive dampener against airplane and highway noise.
- + Pest Deterrent: It is heavily treated with borate, a natural compound that repels roaches, termites, and silverfish.
The Vulnerabilities
- - Severe Settling: It is notorious for settling up to 20% in the first few years, requiring contractors to heavily "over-blow" to hit target R-values.
- - The Moisture Trap: This is the deal-breaker for many DFW homes. Cellulose absorbs water. If a roof leak hits cellulose, it becomes a soggy, compacted block that takes forever to dry out, rapidly breeding mold and collapsing ceiling drywall from the sheer weight.
The Bottom Line:
If you live directly under the flight path of DFW airport or love the dense, quiet feel it provides, Cellulose is excellent. However, you must pair it with a flawless, leak-free roof and extreme attic ventilation to prevent it from absorbing high-summer humidity.