Although we always had a basic plan for the plumbing, up from the central ground floor machine room, into the space behind the seats in the sunken seating area, and then radiating out to wherever needed, the fine details were not finalized.
Now RJ of his eponymous plumbing company is filling in those details.
We really did not want a whole forest of vent pipes through the roof, so all the venting has to run around the inside perimeter of the building and then out to the one vent stack at the high point of the roof. That's a lot of vent.
Most of the drain pipes lead from the bathroom and the kitchen, down into the false ceiling of the garage. Originally we had planned for about 10 inches of insulation over these and thought that that would alleviate any worry of the p traps and waste lines freezing. However by the time the required fall was plumbed in the lowest point is now 8 or so inches below the floor above. That floor is a CLT element box and is insulated, so little heat will leak down from inside the house. That leaves our waste pipes too exposed to the colder temperatures of the garage which will not be heated.
The solution we have arrived at is to box the pipework in and sheath the lower side and then insulate beneath this with around 4 inches of wood fiber. We will then run a couple of loops of pex through the cavity and keep that space at a suitable temperature with thermostatically controlled hydronic heat from our heat pump.
The vent stack circling the building:
A mass of piping in the garage roof that needs not to freeze:
Here we are utilizing the space behind the sunken seats:
Now RJ of his eponymous plumbing company is filling in those details.
We really did not want a whole forest of vent pipes through the roof, so all the venting has to run around the inside perimeter of the building and then out to the one vent stack at the high point of the roof. That's a lot of vent.
Most of the drain pipes lead from the bathroom and the kitchen, down into the false ceiling of the garage. Originally we had planned for about 10 inches of insulation over these and thought that that would alleviate any worry of the p traps and waste lines freezing. However by the time the required fall was plumbed in the lowest point is now 8 or so inches below the floor above. That floor is a CLT element box and is insulated, so little heat will leak down from inside the house. That leaves our waste pipes too exposed to the colder temperatures of the garage which will not be heated.
The solution we have arrived at is to box the pipework in and sheath the lower side and then insulate beneath this with around 4 inches of wood fiber. We will then run a couple of loops of pex through the cavity and keep that space at a suitable temperature with thermostatically controlled hydronic heat from our heat pump.
The vent stack circling the building:
Here we are utilizing the space behind the sunken seats:
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