Topic · Weatherization
Mass Save HEA 23-item checklist, attic R-49 rebate path, air sealing 100% rebate tier, blower door numbers that matter, income-eligible enhanced math.
12 articles published in this topic · updated weekly.
Weatherization & InsulationDefinitional··8 min read
'Mass Save approved' is not one designation — it's three. Knowing the difference between general approved, HPC, and Income Eligible authorization changes which rebates a contractor can file.
All Weatherization Articles
Sorted newest first. Each article links downstream to the relevant Pro Build service pages and to other articles in the same cluster.
Pro Build pillar reference on MA weatherization — Mass Save process, insulation, air sealing, HEA, contractor verification.
12 min readRead →
10 insulation types compared for MA old-home walls. Dense-pack cellulose wins on cost; closed-cell foam wins on R-value; mineral wool wins on fire+moisture combo.
9 min readRead →
Nine mistakes that disqualify Mass Save weatherization rebates after the work is done. Knowing them upfront protects the $1,000-$4,000+ stack.
8 min readRead →
Put a vapor barrier in the wrong place in Massachusetts and you trap moisture in the wall. Here's what the classes mean and where each belongs in zone 5.
9 min readRead →
A blower door is the instrument that turns a vague "drafty house" into a hard number. Here's what CFM50 and ACH50 mean and the targets MA homes are built to.
8 min readRead →
Massachusetts sits in IECC climate zones 5A and 6A, which set specific minimum R-values for every insulated assembly in a home. This is the target table by assembly.
9 min readRead →
Insulate first. R-49 attic = 1-5 year payback vs 15-20 year for windows. Mass Save covers 75-100% of insulation.
7 min readRead →
R-19 to R-49 upgrade payback math, the Mass Save 75-100% rebate path, and why most MA homeowners pay $0 out of pocket on this project.
10 min readRead →
12 heat loss sources ranked by impact + Mass Save rebated remediation cost — start with highest-impact, lowest-cost wins first.
9 min readRead →
Every item the Mass Save HEA auditor checks, with the rebate value tied to each finding — and the income-eligible enhanced tier path most homeowners miss.
11 min readRead →
Which MA towns adopted stretch code vs specialized stretch — with U-factor, insulation, and ACH-50 requirements per tier.
9 min readRead →
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