--- title: "Grade 1 Insulation" description: "Grade 1 Insulation describes itself on its website as an installer of insulation and air sealing systems, from new construction to renovations and upgrades" doc_version: "2026-10-20" last_updated: "2026-10-20" --- # Grade 1 Insulation **Trade:** Insulation & Weatherization · **Phone:** (603) 507-5881 · **Website:** http://grade1insulation.co/ · **Languages:** English **Rating: 3.9/5** (low confidence) — from 5 reviews across 5 sources. 100% of sentiment-scored reviews read net-positive. Last 6 months: 3 reviews, 0 negative. ## The honest read Grade 1 Insulation describes itself on its website as an installer of insulation and air sealing systems, from new construction to renovations and upgrades. It lists a service area that runs from Manchester and Concord to Portsmouth, Kittery, Haverhill and Lowell. A recent Google customer hired the company to air seal an attic and take it from R-30 to R-60, and said the team was fast and professional. Afterward, that customer wrote, the air from the air conditioner was so much colder that it gave the customer's wife goosebumps. A recent customer said the crew was respectful and showed up promptly. A recent reviewer credited Keith and his team and wrote that the company and owner care about the work they install. A 2026 customer said the crew did work on their basement, and that everyone they dealt with was professional and happy to answer questions. A 2025 customer said Keith and his crew blew insulation into three ceilings that had none after a kitchen renovation, arrived on time, and made quick work of it. **Strengths:** - Attic air sealing — a recent customer went from R-30 to R-60 - Prompt arrival — a recent customer said the crew showed up promptly - Blown-in insulation — a 2025 customer said three bare ceilings went quickly ## Claims & citations Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication. - Describes itself as installing insulation and air sealing systems for new construction, renovations and upgrades _(confidence: medium)_ - [Official Website](http://grade1insulation.co) — “About (self-reported, verbatim): From new construction to renovations and upgrades, Grade 1 Insulation installs practical insulation and air…” - Lists a service area including Manchester, Concord, Portsmouth, Kittery, Haverhill and Lowell _(confidence: medium)_ - [Official Website](http://grade1insulation.co) — “Stated service area (self-reported): Manchester, Concord, Nashua, Portsmouth, Dover, Kittery, York, Haverhill, Newburyport, Lowell, Andover,…” - A recent customer hired the company to air seal an attic and bring it from R-30 to R-60 _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT205UlRGaG5SbHBpWmpGalIzQTRVbXR1ZVdodU0yYxAB!2m1!1s0x0:0x89504ebc594fd1ed!3m1!1s2@1:CAIQACodChtycF9oOm9RTFhnRlpiZjFjR3A4UmtueWhuM2c%7C%7C?hl=en-US) — “5★ We hired Grade 1 to air seal and add insulation to our attic to get us to from R-30 to R-60. The team was fast and professional. After th…” - A recent customer said the crew was respectful and showed up promptly _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2s5UFdIcHNRVXB1UTJveWNsSmpZVlpXVlRkU2QzYxAB!2m1!1s0x0:0x89504ebc594fd1ed!3m1!1s2@1:CAIQACodChtycF9oOk9PWHpsQUpuQ2oyclJjYVZWVTdSd3c%7C%7C?hl=en-US) — “5★ The crew from Grade 1 Insulation was respectful and showed up promptly.” - A 2025 customer said Keith and his crew blew insulation into three ceilings that had none after a kitchen renovation _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnTUNnbllUdE5REAE!2m1!1s0x0:0x89504ebc594fd1ed!3m1!1s2@1:CIHM0ogKEICAgMCgnYTtNQ%7C%7C?hl=en-US) — “5★ Keith and his crew at Grade 1 Insulation did a fantastic job blowing in insulation in our home! Due to a kitchen renovation, we had three…” - A 2026 customer said everyone they dealt with on a basement job was professional and happy to answer questions _(confidence: medium)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2xoVWJEQmZkelJMUmtWRFVYZzRVVlYyYldzNFpuYxAB!2m1!1s0x0:0x89504ebc594fd1ed!3m1!1s2@1:CAIQACodChtycF9oOlhUbDBfdzRLRkVDUXg4UVV2bWs4Znc%7C%7C?hl=en-US) — “5★ The crew did some amazing work on our basement! Always a bit nervous about what subs a contractor will go with, but we have nothing but g…” - 5 stars from 5 Google ratings _(confidence: high)_ - [Google](https://www.google.com/maps/search/?api=1&query=Grade%201%20Insulation&query_place_id=ChIJG41LHG9J4okR7dFPWbxOUIk) — “Google: 5★ from 5 ratings” - Specializes in Insulation & Weatherization _(confidence: high)_ - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT205UlRGaG5SbHBpWmpGalIzQTRVbXR1ZVdodU0yYxAB!2m1!1s0x0:0x89504ebc594fd1ed!3m1!1s2@1:CAIQACodChtycF9oOm9RTFhnRlpiZjFjR3A4UmtueWhuM2c%7C%7C?hl=en-US) — “5★ We hired Grade 1 to air seal and add insulation to our attic to get us to from R-30 to R-60. The team was fast and professional. After th…” - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnTUNnbllUdE5REAE!2m1!1s0x0:0x89504ebc594fd1ed!3m1!1s2@1:CIHM0ogKEICAgMCgnYTtNQ%7C%7C?hl=en-US) — “5★ Keith and his crew at Grade 1 Insulation did a fantastic job blowing in insulation in our home! Due to a kitchen renovation, we had three…” - [Official Website](http://grade1insulation.co) — “About (self-reported, verbatim): From new construction to renovations and upgrades, Grade 1 Insulation installs practical insulation and air…” ## License NH doesn't license or register this trade, so there's no state registry to check. That's true of every business in this trade, not specific to this one. ## Sources - [Reddit](https://www.reddit.com/r/HomeImprovement/comments/etbluw/first_time_insulation_how_does_this_look/ffgbv61/): 0 community mentions discussing this business - [Local News](https://southern-energy.com/grade-1-insulation-why-does-it-matter/): Listed on this source - [Google Reviews](https://www.google.com/maps/search/?api=1&query=Grade%201%20Insulation&query_place_id=ChIJG41LHG9J4okR7dFPWbxOUIk): Listed on this source - [Google](https://www.google.com/maps/search/?api=1&query=Grade%201%20Insulation&query_place_id=ChIJG41LHG9J4okR7dFPWbxOUIk): 5.0★ from 5 ratings - [Official Website](http://grade1insulation.co): Self-reported profile and service details ## Recent reviews - **5/5 · Google Reviews · MRK · 2026-06-24**: We hired Grade 1 to air seal and add insulation to our attic to get us to from R-30 to R-60. The team was fast and professional. After they were done my wife commented that she now has goosebumps from the air that is coming from the air conditioner since it is so much colder! We had no idea how much… - **5/5 · Google Reviews · benjamin couture · 2026-05-29**: Keith and his team do a fantastic job. It’s nice to work with a company/owner that truly cares about not only the work they install, but the satisfaction of his customers as well. Insulation is an important part of any home that often gets over looked or hidden behind the drywall. If you want a job … - **5/5 · Google Reviews · Alyssa Josef · 2026-05-28**: The crew from Grade 1 Insulation was respectful and showed up promptly. - **5/5 · Google Reviews · Ryan Kirkpatrick · 2026-03-27**: The crew did some amazing work on our basement! Always a bit nervous about what subs a contractor will go with, but we have nothing but good things to say about Grade 1 Insulation. Everyone we interacted with was professional, happy to answer our questions, and cared about the quality of their work. - **5/5 · Google Reviews · scott silva · 2025-02-20**: Keith and his crew at Grade 1 Insulation did a fantastic job blowing in insulation in our home! Due to a kitchen renovation, we had three ceilings with no insulation, and they made quick work of it. They arrived on time, went above and beyond the original quote, and ensured everything was done effic… --- Data freshness: last scanned 2026-10-18T03:47:16.325Z. Cite as: Grade 1 Insulation — Tavlee (https://tavlee.com/contractor/grade-1-insulation) Source: https://tavlee.com/contractor/grade-1-insulation ## Sitemap [Full site index](https://tavlee.com/sitemap.md)