Stove Air supply

Where should the air supply for a stove be placed for a raft foundation i.e.
a) under the raft, where does the pipe terminate outside ?
b) Over the raft in the insulation, Is this not undermining the insulation layer ?
c) Elsewhere ???

Thanks

kieranhr

You can do either. If under the raft, you'll end up with the pipe in the footpath, so you'll have to put a mushroom cap on it. If under the screed, you can turn it up and out through the cavity, which is neater.
Yes, technically you are reducing the effectiveness of the floor insulation, but by a negligible amount. If you're reducing a 100mm wide strip of floor insulation from 150mm to 50mm, it's costing you maybe a couple of euro a year.

Bscan86

If you're building a cavity wall you could run the pipe under the concrete from the fireplace to the cavity, turn the pipe up 90 degrees and then up maybe a foot and another 90 degree bend out through the outer leaf.

Calahonda52

For exposed sites, with the risk of positive or negative pressure on the windward or leeward side of the house respectively, good practice advises that the air supply is balanced by bringing a supply from both sides into a Tee and then to the stove.

Very important that no water can ever lodge in these pipes

The other idea is to incorporate the air supply in the chimney stack, some solutions out there which negate the issues above as the stack and intake are always at the same air pressure

4odh4n

ours was brought in through the insulation, 204x60 rectangular ducting was used and still able to lay 80mm insulation over the duct. As said, a feed from two different directions, into a box to equalise the air pressures and then a feed to the stove, last meter or so to the stove is a 100mm round metal pipe, an inch or so was cut out of the concrete floor below the pipe to allow it sit lower and still maintain the 80mm cover (stove on an internal wall)

thebackbar

mayomaffia wrote: »

Where should the air supply for a stove be placed for a raft foundation i.e.
a) under the raft, where does the pipe terminate outside ?
b) Over the raft in the insulation, Is this not undermining the insulation layer ?
c) Elsewhere ???

Thanks

Probably worth also discussing this with the company you intend to buy your stove off or at the very least the person you intend have install the stove so that it lines up with their expectations, much easier to change things now on paper.

covey09

any one have any pic of the process

homewardbound11

You have ample room over the raft . It will come out above the footpath . That is assuming you have 100mm -150 mm insulation and screed on top .
You wond have water coming in either .