How can I make a cheap foam for sealing spaces – thats not edible by bugs :-)?
How cheap is cheap? Self-expanding foam can already be purchased at your local hardware store in the US, and to the best of my knowledge, it isn’t the sort of thing that bugs want to eat. Not sure about other countries, but definitely here in the US. Cost is under $10 per canister. Self-expanding foam works by mixing two or more chemicals together, in which one decomposes during the reaction into a gas, forming bubbles, and the other(s) form the cell walls. FYI, One tricky thing about using these products is that they have a great deal of quasi-hydraulic strength. Apply too heavily in a closed space like behind a Drywall construction can result in damage of the drywall. I believe the same could be said for plaster-lathe. The foam has an incredible ability to deform a wall. As for literally “making” it yourself, (adding purchasable chemicals together), I’m honestly not sure how that can be done by an average citizen. I suspect that it might be difficult to obtain the consituent chemical
