10 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Sparks: Spray Foam Giants, CR Score 62/100; 5.0★ from 26 Google reviews; open Saturdays until 6 PM.
Most-reviewed: Gale Building Products, 39 Google reviews at 3.8★, the most of 10 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
10 Sparks insulation contractors are ranked here by CR Score, from ten published factors. 4 open Saturdays and 2 open Sundays, based on posted hours. The median Google rating is 4.7★ across 10 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Spray Foam Giants | 62 | 5.0★ (26) | Sparks | Sat | Overall |
| 2 | Silver State Firestop & Insulation LLC | 60 | 4.6★ (11) | Sparks | Sat · Sun | — |
| 3 | ALCAL Specialty Contracting Reno - Home Service Division | 59 | 4.6★ (9) | Sparks | Sat · Sun · Evenings | — |
| 4 | Gale Building Products | 59 | 3.8★ (39) | Sparks | — | Most reviews |
| 5 | Havelock Wool | 58 | 4.5★ (22) | Reno, 2 mi away | — | — |
| 6 | Foam King Inc | 54 | 4.8★ (23) | Truckee, 23 mi away | — | — |
| 7 | State Insulation | 53 | 4.2★ (29) | Carson City, 23 mi away | — | — |
| 8 | Western Partitions | 51 | 5.0★ (13) | Sparks | — | — |
| 9 | Jakes Roofing & Coatings | 49 | 5.0★ (6) | Sun Valley, 5 mi away | Sat | — |
| 10 | Go Green Roofing & Insulation | 48 | 4.8★ (6) | Spanish Springs, 13 mi away | — | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Insulation contractor”.
Based in Sparks
Ranked #2 because of its Google rating and trade focus: 4.6★ from 11 Google reviews, listed on Google as “Insulation contractor”.
Based in Sparks
Ranked #3 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Insulation contractor”.
Based in Sparks
Ranked #4 because of its Google rating and review volume: 3.8★ from 39 Google reviews, the most in Sparks.
Based in Reno, 2 mi away
Ranked #5 because of its Google rating and trade focus: 4.5★ from 22 Google reviews, listed on Google as “Insulation contractor”.
Based in Truckee, 23 mi away
Ranked #6 because of its Google rating and trade focus: 4.8★ from 23 Google reviews, listed on Google as “Insulation contractor”.
Based in Carson City, 23 mi away
Ranked #7 because of its Google rating and trade focus: 4.2★ from 29 Google reviews, listed on Google as “Insulation contractor”.
Based in Sparks
Ranked #8 because of its Google rating and review volume: 5.0★ from 13 Google reviews.
Based in Sun Valley, 5 mi away
Ranked #9 because of its Google rating and review volume: 5.0★ from 6 Google reviews.
Based in Spanish Springs, 13 mi away
Ranked #10 because of its Google rating and trade focus: 4.8★ from 6 Google reviews, listed on Google as “Roofing contractor”.
National price ranges in USD, not adjusted for Sparks. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Attic insulation | $1,700 | $2,100 | $2,500 | Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range | October 2026 |
We scored 10 Sparks insulation contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Sparks data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |