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1L243

Oregon

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Posted: 01/21/21 10:47pm Link  |  Quote  |  Print  |  Notify Moderator

My 500 watt system of 5 panels will be on order soon. I have watched several install videos, almost all videos show the installer mounting the solar panel brackets by screwing into the roof. Only one made any mention of looking for trusses to screw into. My roof has 3/8" plywood sheathing. Is it necessary to find a truss or is screwing in the sheathing acceptable? Panels can be placed more precisely if you don't have to hit a roof truss.


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2oldman

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Posted: 01/22/21 04:47am Link  |  Quote  |  Print  |  Notify Moderator

You'll be fine with that.

#1Flyboy

California

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Posted: 01/22/21 07:18am Link  |  Quote  |  Print  |  Notify Moderator

.... I’ve read where some people have used something like Dicor or Liquid Nails between the roof & mounting brackets.....

jshupe

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Posted: 01/22/21 08:42am Link  |  Quote  |  Print  |  Notify Moderator

You will be fine screwing into 3/8" ply. The usual procedure for a 3/8" ply with a rubber membrane is to use 3M 4200, Chemlink M1, or Dicor between the roof and the Z bracket, use #14-1" stainless pan head screws, glob some sealant on top of the screws, and not worry about them going anywhere.


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CA Traveler

The Western States

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Posted: 01/22/21 09:38am Link  |  Quote  |  Print  |  Notify Moderator

I don't recommend Z brackets because of the difficulty of panel removal if needed. Instead use 2 pieces of aluminum angle bolted together to form a Z, easy to remove panel.


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Lwiddis

Lake Crowley area, California

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Posted: 01/22/21 01:34pm Link  |  Quote  |  Print  |  Notify Moderator

My panels are screwed into 3/8 plywood. Four+ years now with no issues.


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Jay58

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Posted: 01/22/21 03:27pm Link  |  Quote  |  Print  |  Notify Moderator

Mine are screwed into 3/8 plywood thru a 6 inch long aluminum angle 2x2 with 5200 sealant/adhesive to glue down and seal fastener holes. Wires were attached to roof with eterna-bond tape ( no screw required)


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jshupe

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Posted: 01/22/21 03:45pm Link  |  Quote  |  Print  |  Notify Moderator

Jay58 wrote:

Mine are screwed into 3/8 plywood thru a 6 inch long aluminum angle 2x2 with 5200 sealant/adhesive to glue down and seal fastener holes. Wires were attached to roof with eterna-bond tape ( no screw required)


No plans to ever remove them!

Lwiddis

Lake Crowley area, California

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Posted: 01/22/21 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

I agree, JS. Break in the glass would be the only reason.

pianotuna

Regina, SK, Canada

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Posted: 01/22/21 06:55pm Link  |  Quote  |  Print  |  Notify Moderator

Jshupe,

Mine are aluminum angle screwed to the roof. I used just 3 screws per side. They are still in place.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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