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Top-Rated Roof sealant application pros in Islip - Updated Nov 2026

Avatar for Four Seasons Roofing
Four Seasons Roofing
4.6(
150
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

In business since 1983

Free estimates

Emergency services offered

"Bill Taylor, the President of the company, carefully surveyed the condition of the roof. His detailed, clear estimate addressed all of my concerns. The crew assigned to the project was efficient and courteous. The company is GAF certified, ensuring the warranty will be honored. I highly recommend Four Seasons Roofing."
GAF Preferred Contractor Badge
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+19

Response time2 days
Response rate100%
15 neighbors recently requested a quote
Avatar for O'Brien Brothers Contracting, Inc.
O'Brien Brothers Contracting, Inc.
4.9(
214
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2015

Free estimates

Emergency services offered

"They did a good job at the price they stated and were very professional. It was a small repair job. But I am hoping it will last and the roof would not need attention for a few more years."
Copper flashings
Plywood
G.A.F Architectural shingles
Only the best materials
Chimney flashing and roof repairs

+53

Response time9 hrs
Response rate94%
15 neighbors recently requested a quote
Avatar for Onyx Home Construction, Inc.
Onyx Home Construction, Inc.
4.7(
139
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Emergency services offered

"Very professional and cleaned up all work. Would highly recommend. Dimitri called very quickly after on request/ came same day for estimate . Came next day to repair. Pricing was more than fair. Dimitri also took before and after pictures of roof and explained to me where the leaks were coming from and not only went out of way to fix the problem but went beyond insure that the flashing and new shingles were installed properly. He also moved my dryer vent that that was previously installed incorrectly and went to Home Depot to get the proper materials for the vent along with calling me at the store to confirm that he was able to get all the materials before coming back. Been doing construction on my homes for many years and I'm kicking myself on not using Dimitri in the past. Now have many more projects lined for this company."
Gutter guard
Gutter Guard
Gutter Guard
Gutter Guards
Gutter Guards

+53

Response time4 hrs
Response rate99%
15 neighbors recently requested a quote
Avatar for Non Stop Home Improvements Inc
Non Stop Home Improvements Inc
5.0(
57
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"Great job by Deniz and his hard working men. I had to go to work when they started but my retired next door neighbor watched them and told me they worked almost non- stop on a very hot 93 degree day. I would highly recommend Deniz to anyone looking for high quality roof work."
New Roof - Setauket
New Roof - Setauket
New Roof - Setauket
New Roof - Setauket
New Roof - Setauket

+12

Response time1 day
Response rate100%
2 neighbors recently requested a quote
Avatar for All State Roofing and Chimney, Inc.
All State Roofing and Chimney, Inc.
4.8(
282
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"All State Roofing and Chimney Company did an amazing job repairing my leaking roof and damaged chimney. The team arrived on time, explained the repair process clearly, and completed everything with excellent craftsmanship. They replaced broken shingles, repaired the chimney flashing, and cleaned the entire work area before leaving. Their professionalism and attention to detail were impressive. I highly recommend All State Roofing and Chimney Company for anyone looking for dependable roofing and chimney repair services."
chimney rebuild
chimney repair
chimney rebuild
chimney rebuild
install new gutter screen

+54

Response time3 hrs
Response rate88%
82 neighbors recently requested a quote
Avatar for All Phase Construction, Inc.
All Phase Construction, Inc.
4.6(
504
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Free estimates

Emergency services offered

"Tony came out on Sunday, 3-5-23 to check my leaking roof. While 2 other contractors said the WHOLE back of the house needed the roofing replaced, Tony showed me how he would address the leak while keeping the rest of the roof intact. I have a wide ranch with 2 gable extentions off the back with semi flat in between. The guys pulled up the flat tar paper, put down rubber membrane, extending two feet up the pitch sides, rubber membrane and copper flashing around the chimney (which is where they said the leak was from), and re flashed and replaced the hood for my cooking range exhaust fan. The new architectural shingles match perfectly to the existing. Except for the work done, you'd never know they were even there. That's how good the cleanup was. Now I can't give full props yet because I've got to wait for the next rain, but so far I'm very impressed. - Shawn D. Hauppauge, NY"
chase top
chase top after
new chimney flashing
new roof
new roof

+13

Response time3 hrs
Response rate90%
94 neighbors recently requested a quote
Avatar for Best Choice Roofing and Chimney, Inc.
Best Choice Roofing and Chimney, Inc.
4.3(
1,675
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Free estimates

Emergency services offered

"I hired Best Choice for a serious roof leak which required special handling and materials because it was a flat roof. They worked nonstop for two days to ensure it was completed before the rainstorm that was also expected in two days. They were just great, friendly and very professional and the completed job was perfect; no more leaks. Clean up was great, not even a nail was left behind. In fact, they were so good, I also hired them for new siding on my house, gutter screens, masonry on my foundation, concrete step repairs, leveling my backyard, power washing the whole house and fence and walkways. My house looks just beautiful and I would never use any other company but Best Choice. They ARE my Best Choice by far and a pleasure to deal with. I especially want to thank Arber, Ed, Tim, Ramsey and Al for all of their hard work. These guys are devoted to their craft and it shows in the work they do. Try them, I am sure you will not regret it for a minute."
Old Roof Removal
Roof
Installing new plywood
New Roof Completed
New Roof

+13

Response time11 hrs
257 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Best Way Roofing & Chimney
Best Way Roofing & Chimney
4.9(
14
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"We have been having a problem with pigeons hanging around all day on/under our solar panels. I originally had a handyman who was going to install mesh around the edges of the panels and yesterday (the day he was supposed to come) found out he didn't have insurance/license so I canceled. I then went into a Zoom meeting and heard the darn pigeons cooing and fluttering all over the roof and got so upset. I came to Angi and found Best Choice Roofing (aka Best Way) - he called me back right away and in less than an hour he was here. The first thing he did was hand me his business card with his License # on it. Very professional. He got up on the roof, then in a few minutes came down and gave me an estimate. Once I accepted, he called his team to assist and he started on the roof. They were super clean - blew out my gutters, blew everything out from under the solar panels, and made sure to blow the porch and front of my house to remove any debris. I had peace of mind that they were licensed and insured. Today I am happy to announce, I have not heard ONE PIGEON! I know this company usually does more like roofing and gutter-type projects, but I will be letting any of my neighbors with solar panels/pigeons know who to call. Great crew. Thanks so much!"
Response time5 hrs
Response rate95%
98 neighbors recently requested a quote
Avatar for Landstar Construction
Landstar Construction
5.0(
28
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2015

Free estimates

Emergency services offered

""I recently had some work done on my flat roof, and I am extremely pleased with the results. Landstar construction was professional, knowledgeable, and efficient. They took the time to explain the process and answer all of my questions, which made me feel confident in their expertise. The quality of the work is outstanding. They used top-notch materials, and the installation was flawless. My flat roof now looks better than ever and is well-protected against the elements. I've already noticed a difference in energy efficiency, which is a great bonus. I highly recommend Landstar construction for any flat roof needs. Their attention to detail, excellent customer service, and commitment to quality make them the best in the business. I couldn't be happier with the outcome!""
COPPER FLASHING
NEW ROOF
SKYLIGHT REPLACEMENT
SKYLIGHT REPLACEMENT
Paint Gaco

+3

Response time4 hrs
Response rate100%
136 neighbors recently requested a quote
Avatar for All Ways Construction, Inc.
All Ways Construction, Inc.
5.0(
267
)
Sealant for Roof - Apply

Serving Islip, NY and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"Larry and his Crew did excellent job on my roof replacement and gutter install. His price is very reasonable and he is very knowledgeable. He Keep me update and sending me pictures and explain to me what need to be done . And his craftsmanship is outstanding . I am already lineup job for him on my two other houses I am highly recommend Larry and his crew."
New chimney flashing
New supreme skylight
New supreme skylight
New plywood
New roofing asphalt shingles

+49

Response time4 hrs
Response rate86%
17 neighbors recently requested a quote
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