size of RSJ for through lounge?

[DIYedboy]

I have a 30's semi, I want to knock through to make a lounge diner. I will contact the building regs lot and will have to get structural calc's so it's all done right.
In the meantime, just as a rough guide, the wall is load supporting, single brick, I intend to leave 18" each side to support the padstone and RSJ, the clear span will be 9 feet, roughly how tall/ wide will the steel need to be?

 

[noseall]

Prolly 178mm x 102mm x 19kg UB but only a guess.

Bet Tony wishes the span was less...

 

[tony1851]

Noseall;

A 178 x102 would be well-OK.

Now - seriously - I'm not joking about this(!) but, if it's supporting a 1/2 brick wall, plus - presumably 1/2 floor from each side - on a rough calc. I think he'd still be fine with a -wait for it - 152x89!!

9ft is not a big span, and a 6" deep joist will fit in better with his courses.

 

[DIYedboy]

Thanks lads, am I right in thinking that I have to cover the beam with 2 layers of plasterboard? or can I put mesh across it and have that plastered?

 

[dann09]

DIY ed,

Perhaps have a look at this BCO site:

horsham.gov/environment building control guidance

 

[DIYedboy]

Out of interest, is it better to fit the padstone n steel and then knock the bricks out beneath? or is it better to do all the knocking out then fit the stones n steel?

 

[dann09]

It depends on site conditions: eg any shaky brickwork, whats the above load, joist runs, and perhaps point load(s).

Usually, we would prop and then remove the masonry.
And then lift or slide in the steel.
Propping, and perhaps wedging off the lintel, is the key to safe and sound linteling

Padstones, if possible, would be placed or poured, and allowed to settle before the other work.

AAMOI: if you wished to eliminate the two 18" nibs you could, by upping the lintel specs a little, rest the lintel bearings in the opposing walls - just a thought.