View Poll Results: how many layers to make it very rigid??

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  • 7-9

    6 40.00%
  • 9-11

    4 26.67%
  • 11-13

    2 13.33%
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Reload Thread: how many layers??

  1. #1
    SPL140.2's Avatar
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    how many layers??

    im still a noob at fiberglassing, how many layers do i have to put down to make an enclosure very, very rigid??? itll be going over a cardboard base.



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  2. #2
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    Re: how many layers??

    until you can stand on it...so id say 5-6




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    Re: how many layers??

    or i guess 7-9 if you going by the poll




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    Re: how many layers??

    going over 7 is that overkill??



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    Re: how many layers??

    Depends entirely on the enclosure, On curved areas you dont need as much, on flatter areas you need more layres.

    THe best tests are standing on the area and pushing as hard as you can with your thumb. Pushing as hard as you can with your thumb and standing on it will both put more pressure on it than your stereo system ever could so if it doesnt flex you are good.




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    Re: how many layers??

    yes it will be a circular "tube" enclosure



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    Re: how many layers??

    what size / type sub are you putting in there. some cheap 10'' sub isn't going to be nearly as strong as a, lets say, a 15" RE XXX. the bigger and nastyer the sub, the more layers you would wanna put on. i would say if it's not going to have any flat spots in it, 7 or 8 would be just fine.




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    Re: how many layers??

    like stated above you have to test the panel by applying pressure to it, in order to know if the panel is strong enough. i would start with 7 layers, then test the strength and add mare layers accordingly and if necessary. a way to make the enclosure stronger is to add bracing to the enclosure, in a fiberglass enclosure i have found that its comfortable to use 1/2" polyester rope which conforms to the curved faces of the panels and makes for a very strong brace that can be resined in place.




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    Re: how many layers??

    Quote Originally Posted by rollerdj View Post
    what size / type sub are you putting in there. some cheap 10'' sub isn't going to be nearly as strong as a, lets say, a 15" RE XXX. the bigger and nastyer the sub, the more layers you would wanna put on. i would say if it's not going to have any flat spots in it, 7 or 8 would be just fine.
    10" HD3



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  10. #10
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    Re: how many layers??

    Quote Originally Posted by SPL140.2 View Post
    going over 7 is that overkill??
    I think im just gonna do 10-12 layers to be on the safe side



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  11. #11
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    Re: how many layers??

    What weight mat ? Makes a huge difference. 5 layers of 5oz is a lot weaker than 5 layers of 15oz biaxial



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    Re: how many layers??

    Quote Originally Posted by ramos View Post
    What weight mat ? Makes a huge difference. 5 layers of 5oz is a lot weaker than 5 layers of 15oz biaxial
    x2

    Though he is probably using 5-6oz stuff from Home Depot.

    Also, Move to cloth. Two layres of cloth with the weaves at 90* from each other is stronger than two layres of mat when the two are the same weight.

    Cloth has directional strength, mat sacrafices directional strength to be stronger in all directions but you can criss cross cloth to gain back the strength in any direction.




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    Re: how many layers??

    Quote Originally Posted by CBFryman2 View Post
    x2

    Though he is probably using 5-6oz stuff from Home Depot.

    Also, Move to cloth. Two layres of cloth with the weaves at 90* from each other is stronger than two layres of mat when the two are the same weight.

    Cloth has directional strength, mat sacrafices directional strength to be stronger in all directions but you can criss cross cloth to gain back the strength in any direction.

    Not necessarily. Usually the reason one is chosen over the other is that cloth conforms better to curvy surfaces , where as mat tends to be harder to lay on the curvy surfaces . Changing the bias with each layer of mat will yield just as strong a final product . Mat builds thickness a lot quicker than cloth as well .



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  14. #14
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    Re: how many layers??

    I stand corrected.




  15. #15
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    Re: how many layers??

    pics of the cloth??, i do have mat from home depot



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