Standard single storey extension, brick outer, aircrete inner, walls
holding up 1 tonne shallow pitch tiled roof. In a standard build like
this, is there any requirement to increase the catnic style lintel
bearings from the minimum 150mm ? Since it costs not a lot more, I
thought I'd increse bearings to, say, 200mm just to be sure. Any point
in doing this ?

Also, any problem with the 75mm wide contact area for joist hangers or
purlins built into the aircrete wall ?

Also, sometimes engineering bricks are recommended as a spreader, but
this will be reducing the insulation of the wall. In these types of
conflict in regs, what is the usual BCO view ?
(Bit like the conflict between insulation and ventilation at the
moment)
Cheers,
Simon.

sm_jamieson wrote:
Standard single storey extension, brick outer, aircrete inner, walls
holding up 1 tonne shallow pitch tiled roof. In a standard build like
this, is there any requirement to increase the catnic style lintel
bearings from the minimum 150mm ? Since it costs not a lot more, I
thought I'd increse bearings to, say, 200mm just to be sure. Any point
in doing this ?

Probably not, it sounds like the loading on them is going to be minimal.

Also, any problem with the 75mm wide contact area for joist hangers or
purlins built into the aircrete wall ?

What strength are the blocks rated at?

Also, sometimes engineering bricks are recommended as a spreader, but
this will be reducing the insulation of the wall. In these types of
conflict in regs, what is the usual BCO view ?

I would expect that staying up, overrides staying warm! ;-)


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On 30 Apr, 00:29, John Rumm wrote:
sm_jamieson wrote:
Standard single storey extension, brick outer, aircrete inner, walls
holding up 1 tonne shallow pitch tiled roof. In a standard build like
this, is there any requirement to increase the catnic style lintel
bearings from the minimum 150mm ? Since it costs not a lot more, I
thought I'd increse bearings to, say, 200mm just to be sure. Any point
in doing this ?

Probably not, it sounds like the loading on them is going to be minimal.

Also, any problem with the 75mm wide contact area for joist hangers or
purlins built into the aircrete wall ?

What strength are the blocks rated at?

Blocks are Thermalite Shield, 4N/mm^2.
Thanks,
Simon.

wrote:
On 30 Apr, 00:29, John Rumm wrote:
sm_jamieson wrote:
Standard single storey extension, brick outer, aircrete inner, walls
holding up 1 tonne shallow pitch tiled roof. In a standard build like
this, is there any requirement to increase the catnic style lintel
bearings from the minimum 150mm ? Since it costs not a lot more, I
thought I'd increse bearings to, say, 200mm just to be sure. Any point
in doing this ?
Probably not, it sounds like the loading on them is going to be minimal.

Also, any problem with the 75mm wide contact area for joist hangers or
purlins built into the aircrete wall ?
What strength are the blocks rated at?

Blocks are Thermalite Shield, 4N/mm^2.

So with a contact area of 75x150 and x4 you need 45kN to crush the
blocks. That sounds like it should only be a real problem for loads
exceeding 9 tonne evenly distributed on the lintel.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/