Best Way To Fasten 2x4 To Thin Metal? - General Discussion - Contractor Talk

Best Way To Fasten 2x4 To Thin Metal?

 
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Old 08-23-2019, 11:04 PM   #1
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Best Way To Fasten 2x4 To Thin Metal?


I need to install a 2x4 piece of wood about 12 ft long on top of a flat pan patio cover. The aluminum sheets are about .032 or maybe .036 the most. I need this wood to go thru the top thru the sheet and be able to hold a 35 lb object in place.
I was thinking about driving a few 3/8 stainless steel lag bolts thru with double washers on both sides and a nut on the bottom to tighten it.
Is there any better way to hold it down?
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Old 08-23-2019, 11:13 PM   #2
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Re: Best Way To Fasten 2x4 To Thin Metal?


how will you install a nut on a lag bolt?

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Old 08-23-2019, 11:16 PM   #3
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Re: Best Way To Fasten 2x4 To Thin Metal?


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Old 08-23-2019, 11:21 PM   #4
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Re: Best Way To Fasten 2x4 To Thin Metal?


Quote:
Originally Posted by Awningguy View Post
I need to install a 2x4 piece of wood about 12 ft long on top of a flat pan patio cover. The aluminum sheets are about .032 or maybe .036 the most. I need this wood to go thru the top thru the sheet and be able to hold a 35 lb object in place.
I was thinking about driving a few 3/8 stainless steel lag bolts thru with double washers on both sides and a nut on the bottom to tighten it.
Is there any better way to hold it down?
Quote:
Originally Posted by griz View Post
how will you install a nut on a lag bolt?
I meant a bolt not lag bolt
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Old 08-23-2019, 11:35 PM   #5
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Re: Best Way To Fasten 2x4 To Thin Metal?


use 1/4" bolts w/fender washers and put some silicone between the 2x and metal.
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Old 08-24-2019, 07:48 AM   #6
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Re: Best Way To Fasten 2x4 To Thin Metal?


i`m thinking toggle bolts
counter sink the head
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Old 08-24-2019, 02:00 PM   #7
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Re: Best Way To Fasten 2x4 To Thin Metal?


a picture would help .based on what i read i would use a bunch of these screws .small head ,super easy and weather proof .https://www.screwsolutions.com/Bronz...ews_c_147.html
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Old 08-26-2019, 02:23 PM   #8
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Re: Best Way To Fasten 2x4 To Thin Metal?


is the 2x4's job only to spread the weight across the awning? If I understand the description correctly, won't water be able to gather between the 2x4 and awning? I know some PT reacts with some aluminum, keep that in mind.

If this is for hanging something (like plants on bottom of awning) I would spread the weight with apiece of aluminum on top. Even better would be to use three pieces and form an H, if necessary. Maybe light weight potting soil/styrofoam would decrease the weight
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Old 08-26-2019, 05:47 PM   #9
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Re: Best Way To Fasten 2x4 To Thin Metal?


The wood is going on TOP OF THE flat pan roof. Hanging my 35 lbs piece on top of the wood.

The awning is a flat pan and the water runs down on a pitch to the gutter. So if we put a 2x4 which is yes to hold the weight spread evenly the only place water can leak is from the screws which I plan to caulk around them when I put the bolts in. I can also maybe get some flashing stripes and lay it down right where the woood is going and also caulk around the wood . I just want to make sure that a couple of bolts thru the wood into the flat pan thin metal will be able to hold the weight and not cause an issue.

The awning has a couple of posts under so I'm really just worried about the wood holding in place and not being able to ruin the sheets?

So would it be better to have the entire 2x4 for the whole width of the flat pan roof of 14 ft. Or just put small pieces like 3 individual pieces and lay my project on top of them and line them up with a chaulk line?
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Old 08-26-2019, 08:46 PM   #10
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Re: Best Way To Fasten 2x4 To Thin Metal?


I'm very curious as to why an Awning guy needs help with this.


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Old 08-27-2019, 01:01 AM   #11
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Re: Best Way To Fasten 2x4 To Thin Metal?


Quote:
Originally Posted by Calidecks View Post
I'm very curious as to why an Awning guy needs help with this.


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I guess he's very new at it??
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Old 08-27-2019, 04:54 AM   #12
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Re: Best Way To Fasten 2x4 To Thin Metal?


That's what these forums are here for!
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Old 08-27-2019, 08:08 AM   #13
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Re: Best Way To Fasten 2x4 To Thin Metal?


Quote:
Originally Posted by Calidecks View Post
I'm very curious as to why an Awning guy needs help with this.


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Old 08-27-2019, 11:25 AM   #14
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Re: Best Way To Fasten 2x4 To Thin Metal?


We all have to learn somewhere.


A picture is worth about 3000 words in this case.


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Old 08-28-2019, 12:20 PM   #15
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Re: Best Way To Fasten 2x4 To Thin Metal?


Liquid nails over silicone.
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Old 08-28-2019, 12:36 PM   #16
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Re: Best Way To Fasten 2x4 To Thin Metal?


Quote:
Originally Posted by Awningguy View Post
I make awnings. This is not part of am awning.
Then way are you using it
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Old 08-28-2019, 02:50 PM   #17
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Re: Best Way To Fasten 2x4 To Thin Metal?


Quote:
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Liquid nails over silicone.
PL. Premium over both of those.
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Old 08-29-2019, 02:38 PM   #18
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Re: Best Way To Fasten 2x4 To Thin Metal?


Quote:
Originally Posted by griz View Post
how will you install a nut on a lag bolt?

Lag nuts Griz Lag nuts, like most nuts they have a hard exterior with a softer center in fact we call them griz nuts here in FL because of the hard exterior and soft center.

Here in FL they come as a 2 pack but are not sold in big box stores you have to go to a real contractor supply place.
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Old 08-29-2019, 02:43 PM   #19
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Re: Best Way To Fasten 2x4 To Thin Metal?


You can buy them by the sack right?


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Old 08-29-2019, 02:44 PM   #20
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Re: Best Way To Fasten 2x4 To Thin Metal?


Quote:
Originally Posted by Awningguy View Post
The wood is going on TOP OF THE flat pan roof. Hanging my 35 lbs piece on top of the wood.

The awning is a flat pan and the water runs down on a pitch to the gutter. So if we put a 2x4 which is yes to hold the weight spread evenly the only place water can leak is from the screws which I plan to caulk around them when I put the bolts in. I can also maybe get some flashing stripes and lay it down right where the woood is going and also caulk around the wood . I just want to make sure that a couple of bolts thru the wood into the flat pan thin metal will be able to hold the weight and not cause an issue.

The awning has a couple of posts under so I'm really just worried about the wood holding in place and not being able to ruin the sheets?

So would it be better to have the entire 2x4 for the whole width of the flat pan roof of 14 ft. Or just put small pieces like 3 individual pieces and lay my project on top of them and line them up with a chaulk line?
I would love to know what this 2x4 across the top of a roof is for because at the moment placeing a piece of wood flat on a roof that needs to drain sounds bad.

Can you use false wood , plastics that's the future any one who ever graduated knows that even Mrs Robinson.

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