@Davidstock1, the valve is actually at the tip, so no worries about the foam still in the gun body (at least for months). But I don't understand this tip: You're supposed to put a bit of tubing (most commonly clear vinyl) on the tips of these guns (that's what the barbs are there for). When the foam hardens, just pull the tubing off and all the hardened foam comes off with it, ready for installing a new pieces of tubing. How much tubing? I usually use about 4", but it can be shorter if you're working fast and don't want it to flex, or much longer if you need to use your other hand to get the tubing into tighter places than the gun will fit into.
Agreed: Drain must go *below* any seams between the footing and stem/foundation/basement wall or it will not prevent the most common source of water intrusion. No membrane is going to prevent water from coming up from underneath. This is extremely expensive to fix (as is mitigating other short-sighted decisions like omitting insulation below any concrete slab) so it's worth jumping through hoops (e.g., finding another contractor) to get it right.
Argh: Build your vampire loads into the building structure.
The right way to do this would be to standardize on a DC supply system for house wiring and put a single smart converter that would run *all* of the electronics in the house, turning itself on and off automatically. Imagine a world with no wall warts, power supply bricks, thick power cords, or vampire loads! Oh and significantly lower device costs and increased reliability because each one doesn't have to have its own power supply.
The comments on the disadvantages of crawlspaces are just horse and buggy thinking: Crawlspaces should be completely sealed and the walls insulated. Doing so not only saves huge amounts of money on insulation and fill+concrete, but also offers far better potential energy efficiency because thermal transfer from those warm floors through stratified air to ground will be vastly less than through even relatively thick slab insulation. Dig a deep enough crawl space and you can even put your ERV and hot water and solar storage tanks down there, freeing up living space. We've done not only that, but have our swamp coolers down there too where they're protected from the elements (e.g., freezing). Of course, due to soil conditions and flood plain requirements the floor of our crawl space ended up being 5' below the joists. We also have staple-up hydronic heating which not only cost a fraction of what a slab+insulation would have (we did the install ourselves, so not counting labor of course) but it is also far more responsive than a slab-based system which can take days to heat up or cool down.
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