u/ohm44

We moved into this house last fall and haven't winterized the system before.

First pic is the backflow preventer. There is no blow out valve downstream, including in the boxes with the solenoid heads.

Second pic is in our basement. To the right is the supply, to the left goes to the backflow preventer. There's another valve to the left.

Everything I've read indicates you want to hook the compressor up downstream of the backflow preventer. Although I have read if you regulate the pressure, its fine

So 2 questions

1. Is it safe to blow out the system from this valve?

2. The shut off is right next to this port, how do I make sure that I'm blowing air into the irrigation system and not the water supply!

Thanks!

USA - Colorado Front Range

We bought a 1965 house. Tore up the basement carpet to find this cork or particle board tongue and groove subfloor. Then a weird foam-esque underlayment. Then 9" VCT tiles.

We're not planning on testing the tiles, just encapsulating them. Better safe than sorry.

Right now the plan is to finish tearing up the cork subfloor and foam underlayment, encapsulating with self-leveling concrete, and then putting lvp on top.

The wrinkle is that the basement is framed out directly on top of the cork subfloor. And I'm almost certain that the same tile exists in another room that already has lvp over it.

Should we plan on ripping that up to for safety, and pouring the self-leveling concrete there as well, or is the foam underlayment plus the subfloor, plus lvp sufficient protection?

In the front range of Colorado