Insulation & Weatherization Resources | Smooth Construction Services

We built this library because the same three or four questions come up on every consultation — and the answers most homeowners get online are either salesy, outdated, or flat-out wrong about Massachusetts programs. Each article below is the answer we'd give you over coffee. If you want the version for your specific home, request a free estimate.

Most-asked this year

Investment Case

Why spray foam is worth it — even without a rebate

Mass Save® won't rebate spray foam — but in rim joists, crawl spaces, cathedral ceilings, and below-grade walls, closed-cell pays for itself in energy savings, longevity, and performance that cellulose can't replicate. The honest ROI case.

Read the guide → Technical

Open-cell vs. closed-cell spray foam

Closed-cell is denser, has double the R-value, and costs 2–3× more. Open-cell is lighter and cheaper. Which to use where in Massachusetts Climate Zone 5, with 2026 installed costs.

Read the guide → Pricing

Spray foam cost in Massachusetts — 2026

Open-cell $0.45–$0.75 per board foot; closed-cell $1.00–$1.65. Attic $2,000–$5,000; rim joist $500–$1,500; whole home $10,000–$22,000. Full pricing breakdown with red flags.

Read the guide → Rebates

Does Mass Save® cover spray foam?

The honest answer: no. What Mass Save does cover (cellulose, fiberglass, rigid foam, air sealing), why spray foam is still worth it in the right applications, and how to structure a project that gets both.

Read the guide →