in-slab

Hilly

Is it best practice to just fill your entire basement in-slab with tubing at 12" and have even placement throughout and then adjust water temps and flow after to meet heat load requirements? With exceptions like, not under vanity, toilet and have first perimeter piping on closer spacing? And keep 1/2" pex lengths under 300'. Tubes will be tied to wire mesh and brought up half way during pour.

Zman

I think adjusting the spacing to match the heat loss In the individual rooms is a good idea. You just do a room by room heat loss and adjust the spacing accordingly. This is much simpler than a multi temp system.
Why 300'? It will work with fairly robust circulators. With 200' systems work much better with smaller circs.
Carl

hot_rod

If you know how the rooms and walls will be laid out, i agree with Carl. Many times basements are tubed before the owner plans out the room layout, with the exception of bathrooms.

Basements are not typically high load areas, so you have quite a bit of flexibility with tube spacing, and supply temperatures.