Fill kerfs in foam?

So many tangential ideas, irrelevant questions and wordy theories….

I guess I was hoping that someone who has had direct experience laying up KERFED .75” foam with epoxy and glass might be able to offer advice, based on actual experience….or point me in the direction of someone who has done this type of layup.

Of course leaving small air pockets will result in a (very slightly, I think) weakened structure. Drilling holes in a house floor joist to run wires weakens the joist…..but so very little…..that’s why it is OK to do so and still meet structural building codes.

I am going to lay up the strips using this method. I will let you know in 20-25 years if it was worth it….

 

I laid up 12mm one side scrim, yours is 18 and both. I laid it up on an elliptical roof over stay in place plywoodand faced runout concerns, so prefilled the edges with thixo.

Scrim is not made to be laid up empty; the expectation is for thickened resin to fill it.

For any of us here to throw holy water on a misuse of the product would be silly. Based on your last comment, this seems to be your wish. You gave us almost zero information and expected answers we could not deliver.

Scrim will not behave on a station mold unsupported, gravity acts on it and it sags.

 

It seems nobody asked the real question, why would you use strips if you have kerfed foam? Foam gets kerfs for one reason only, to make the sheet conform to curves, wich is exactly the same reason one would use strips. The kerfs need to get filled exactly like strips need to get glued.
Stop beeing obtuse and use the kerfed foam like you are supposed to, bend it over a barrel, apply plenty of thickened resin, then fasten it to a stringered mold and remove the squeezeout. The result is the same as using strips, only faster.

 

OP, you are not unique. A lot of people come here trying to re-invent the wheel and then will not listen to answers that don't reenforce their ill-advised, pre-conceived notions. Being secretive with build details is just icing on the cake.

 

At the beginning, I thought it was different foam, but one thing is certain here. We are uncertain about the intended use.

If there are kerfs on both sides of the foam and he lays it on a mould, then unless I am mistaken, only the convex side would get filled with his plan..the other side would close up.

 

Give up guys.
This is a classic secretive explanation because the OP thinks he has reinvented the wheel.
He is not listening, or doesn't understand, and certainly doesn't have the engineering background to understand.

OP - these are guys who really want to help, but they know enough to see pitfalls in what they understand you are trying to do.