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  1. #14
    Join Date
    Jun 2018
    Location
    Homosassa FL
    Posts
    40
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    No mastic requirements on the duct board to meet code in Florida? Install looks good. Thought it was code requirement to have fiber tape and mastic at A/H to plenum connection and all taped joints have mastic as well......
    Last edited by Anoob; 12-11-2018 at 06:35 AM. Reason: Forgot question and details

  2. #15
    Join Date
    May 2018
    Location
    St.Petersburg
    Posts
    136
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    Thread Starter
    Nope no mastic necessary to pass code, I use mastic tape made by Shurtape most of the time. I’ve never used mastic at plenum, it’s a mess and ruins the look of the job. I’ve never failed an inspection because of not using mastic at AH

  3. #16
    Join Date
    Oct 2014
    Posts
    133
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    We have to use mastic on anything thats metal to metal. Taps, seams, joints, everything. On one small duct job its easy to use 2-3 rolls of mastic and we all know how cheap it is and how its a pain if you ever need to take something back apart.


    Sent from my iPhone using Tapatalk

  4. #17
    Join Date
    May 2018
    Location
    St.Petersburg
    Posts
    136
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    Thread Starter
    Quote Originally Posted by UrAverageAguy View Post
    We have to use mastic on anything that’s metal to metal. Taps, seams, joints, everything. On one small duct job it’s easy to use 2-3 rolls of mastic and we all know how cheap it is and how it’s a pain if you ever need to take something back apart.


    Sent from my iPhone using Tapatalk
    Man I hate the stuff, and hate the hacks who live by " do your best, and mastic the rest! " and it's a nightmare to have to remove any of it

  5. #18
    Join Date
    Oct 2014
    Posts
    133
    Post Likes
    Quote Originally Posted by coharra88 View Post
    Man I hate the stuff, and hate the hacks who live by " do your best, and mastic the rest! " and it's a nightmare to have to remove any of it
    Yeah in my area they are more worried about the tape we use instead of failing houses with 4 ton units on 2 ton duct systems. Ive started using duct butter to cut down on the rolls of mastic.


    Sent from my iPhone using Tapatalk

  6. #19
    Join Date
    Nov 2018
    Location
    Pasco FL
    Posts
    10
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    Quote Originally Posted by coharra88 View Post
    Nope no mastic necessary to pass code, I use mastic tape made by Shurtape most of the time. I’ve never used mastic at plenum, it’s a mess and ruins the look of the job. I’ve never failed an inspection because of not using mastic at AH
    I work out of clearwater and we are told to do so. Did something change? It's all about how you apply it. My mastic looks way better than others that i have worked with in the past. They just slap it on and go. I try to tape and make the lines as straight as possible and the coat just thick enough to cover the tape. I believe we go hit by the code on an attic install because of no mastic under the unit.

  7. #20
    Join Date
    May 2018
    Location
    St.Petersburg
    Posts
    136
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    Thread Starter
    Interesting, it may be code in some counties, heck it may even be in mine.(Pinellas) but I won’t use it unless I have to because it gives something for mold to grow on, and mastic tape does the same thing. Maybe that’s why they always pass me bc mastic tape is a suitable substitute? I don’t mind using mastic when I have too though on commercial jobs with all metal, that the inspector definitely will fail us for. And I’ll take painters tape and make clean lines, and after we put an nice coat of mastic on we’ll peel the tape off to leave a perfect strip.

  8. #21
    Join Date
    Dec 2018
    Posts
    10
    Post Likes
    nice!

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