Plywood backers for Openings in hull

[drewpster]

I am going to be making two openings amidships either side of the hull a few inches under the gunwale. I will be installing louvered vents in these openings to ventilate the bilge and engine compartment.

I know I need to support the gunwale and the opening by backing the opening. I was thinking of glassing the backer in rather than simply gluing it to the back side of the hole for support. Is this overkill?

Also I know I need to use marine ply. However I have hardwood boards available. Should I find some marine ply, or go with hardwood? 3/4"?

 

[tashasdaddy]

Re: Plywood backers for Openings in hull

most of the manufactures, just cut a hole and screw into the glass.

 

[Bondo]

Re: Plywood backers for Openings in hull

I was thinking of glassing the backer in rather than simply gluing it to the back side of the hole for support. Is this overkill?

If you're going to do That,........... Plain'ole CDX will work Just Fine.............3/8", maybe1/2"

 

[drewpster]

Re: Plywood backers for Openings in hull

most of the manufactures, just cut a hole and screw into the glass.

I was going to add a backer because of the location of the vent under the gunwale. I was concerned that the opening would remove support under an area that gets walked on allot.

 

[tashasdaddy]

Re: Plywood backers for Openings in hull

man if you feel more secure doing it. please go ahead. better save than sorry.