Install help!

[stewie1046]

Help regarding installation. We have a ‘ heavy’ clear view- 12kw stove that we want to put free standing in our soon to be converted barn . The barn is on the floor above the garage .The floor where the stove is going to sit has new 6 x2 rafters and a central RSJ and chipboard t and g boards ( 1 inch thick).We want to put the stove in the corner, but raise the corner to make a plinth, sit a slate hearth on it - obviously will get a HETAS engineer to install . I want to raise the plinth ( triangle shaped) say 10 inches from the floor . My thoughts were to put say breeze blocks on the floor - then the slate hearth and front up the front with ceramic tiles. 
Sorry for massive design/ details - but what are peoples thoughts? Do I need to reinforce the rafter below? What about block underneath? - don’t want to make 4x2 box ??
Any ideas- help!
Stew 

[dan blocker]

With out knowledge of joists spacings, span etc it’s difficult to make any specific recommendation? 6 x 2 joists(you say rafters?) arn’t that strong. The combined weight of the stove, slate hearth, plinth construction and firewood could be enough to flex the joists and tension any joints in the flue causing leaks. I would look at some steelwork underneath the plinth construction and in your case get some advice off a structural engineer, HETAS installer. 

[daltontrees]

6" x 2"s would only be suitable for a 8' span. Rafters and joists are for different things.

[Botty Cough]

Cut out the wood floor.

Build up from ground level with block and back fill with concrete. Lay hearth stone on this and then place burner on that.

Replace wooden floor around the new stone base and make it big enough to meet current regs for combustable material contact and add 300 mm on top of that to be sure.

A. 6ft by 4ft base will give ample space to site a burner and meet regs,

Edited February 22 by Botty Cough

[Steven P]

A quick look online suggests 160kg+ for the stove, I would guess 30kg for the hearth? Another 15kg for the weight on the floor for the flu? Non combustible material for the plinth and the tiles and surround - looking at 250kg+ maybe?

 

Perhaps might be worth a quick check with someone

[GarethM]

Visit a local stove shop, and get their recommended installer to visit, you might have to pay for a site visit as you've not bought anything yet.

 

But they'll be able to advise if, where and how it could be done.

 

Maybe another RSJ across the corner, but that's structural engineering territory.

 

No point setting your heart on an exact spot if it fails every reg going or ends up falling through the floor, as that weight is enamel bath territory.

Edited February 22 by GarethM

[Stere]

I was thinking a  bath full of water must weigh about the same or more esp if  an old cast iron one?

 

 

 

 

 

[GarethM]

11 minutes ago, Stere said:

I was thinking a  bath full of water must weigh about the same or more esp if  an old cast iron one?

I was always told it's around 1/2 Ton

[5thelement]

17 hours ago, GarethM said:

I was always told it's around 1/2 Ton

It depends on how high you fill it.
A cubic metre of pure water weighs exactly a metric tonne. 

[GarethM]

Say 100 litres of water plus me at 80kg = 180kg + bath around 150kg for a cast iron one.

 

I can drag a cast iron bath but not lift, so at a guess 150kg.

 

180+150= 330 kg at a lower estimate.