Attach Fittings onto Double Skin?

[RAI]

backing plate

For the mid-ships cleat, a backing plate would be desirable in addition to the epoxy fill.

 

[RichardPerou]

There is no foam in the deck of a Sadler 34 and I doubt very much that there is any in a 26.

For the centre cleats I would be thinking along the lines suggested by Cliff. Cut a hole in the inner skin big enough to take a pad larger than the footprint of the cleat. Cover the hole with a decorative teak panel.

For the genoa track you will probably get away with bolting to penny washers. Drill a series of holes with a hole saw, bolt through the deck, then cover the holes with plastic furniture caps. B&Q sell them, brown or white, about 30 mm diameter.

Posted from Ybw.com App for Android

 

[jwilson]

This is the method proposed in 'Glassfibre Boat Manual'. Works well, even where there is no foam, just needs thicker epoxy.

Agreed, but for really high-load fixings, eg mooring cleats, a bigger foam cutout and reinforcement is better. The thicker the foam layer and thinner the upper glass laminate the more this is important.

 

[vyv_cox]

Agreed, but for really high-load fixings, eg mooring cleats, a bigger foam cutout and reinforcement is better. The thicker the foam layer and thinner the upper glass laminate the more this is important.

See post #10.

 

[RAI]

An inserted backing plate needs to be glassed-in to transfer some stress into the inner fibreglass surface. Otherwise the outer skin is taking all the load.