Fortic tank in loft

[Caballero4]

To save space in first floor kitchen of maisonette, and improve hot water flow, suggestion is to move/install fortic tank in loft above. Don't know capacity but from its height in relation to mine must be 200L+. Serious weight/strengthening implications for loft joists?

 

[lame plumber]

put in an unvented cyl for best flow rate on hw. obey regs re joists. or seek building controls advice.

 

[kay-jay]

Timber supports laid across the joists required then lay over some 3/4 marine ply. Try to position in loft over a load bearing wall if possible.

 

[kay-jay]

P.s make sure it will fit through the hatch....

 

[Caballero4]

Thank you all for these very quick replies. Yes, the job takes into account enlarging the loft hatch.

 

[AWheating]

tamz has a very good picture/diagram of how to build a tank stand in a loft space i think. Im sure he would post it up if you ask nice like.

best over load bearing wall, fully lagged etc.....

use tanalised timber and 25mm marine ply.

 

[Caballero4]

Thank you A Wheating. I'm new to this - how do I ask 'tamz', just a posted polite request ?

Further to this whole issue, is there another option instead of moving the fortic tank, to provide hot water (no CH, only night storage, no gas) for kitchen and bathroom (bath and [soon] electric shower 8.5kw) ?

 

[SimonG]

Post #2.

If you have the water flow and pressure a direct unvented cylinder.

 

[AWheating]

to save bothering him you can see it in this post.

http://www.ukplumbersforums.co.uk/plumbing-forum/28353-building-cwsc-platform.html

 

[Caballero4]

Many thanks for this link. It certainly looks important to get the platform right. The size/weight of the tank must be the key factor.

 

[Caballero4]

We would still need it in the loft to solve the space issue so presumably the platform question is the same.

 

[Caballero4]

We would still need it in the loft to solve the space issue so presumably the platform question is the same.

This was in reply to SimonG.

 

[kay-jay]

yes, platform requirements would be the same.
if its a smallish maisonette you could get away with a 100 or 120 litre unvented cylinder.

 

[stevetheplumber]

tamz has a very good picture/diagram of how to build a tank stand in a loft space i think. Im sure he would post it up if you ask nice like.

best over load bearing wall, fully lagged etc.....

use tanalised timber and 25mm marine ply.

why would you need tanalised timber for a interior structure?any leaks in the loft will be apparent long before the frame started to rot away same for marine ply total overkill

 

[Mike Jackson]

BS 4213 requires 15mm marine ply or 18mm TG flooring as a support for cold water storage cisterns so it makes sense to do the same for a cylinder.

 

[AWheating]

why would you need tanalised timber for a interior structure?any leaks in the loft will be apparent long before the frame started to rot away same for marine ply total overkill

I agree with the tanalised timber really, but probably best practice and not much price difference really. Most the new builds i have done over the past few years that have had tanks have used it. As for marine ply seen plenty of tank stands suffering from water damage from slow drips, cheap ply dont last long with water soaking into it. overkill or not its what i would recommend.