Loadbearing?

[ban-all-sheds]

This isometric sketch shows a single storey rear extension I'm considering.

(The existing house walls (pale brown) do extend further - I've not had a terrible accident with dynamite )

The extension will have a flat roof - my question is could the wall I've highlighted in green be sufficiently load-bearing for the maximum joist span to be about 3.6m, not about 6.3?

 

[tony1851]

Whether its a 100 block wall or timber stud wall, it will be perfectly adequate to support that sort of load.

 

[ban-all-sheds]

Whether its a 100 block wall

or timber stud wall,

it will be perfectly adequate to support that sort of load.

Good-oh - joists for 6m+ spans start to get a bit large.

 

[AronSearle]

Whether its a 100 block wall

or timber stud wall,

it will be perfectly adequate to support that sort of load.

Good-oh - joists for 6m+ spans start to get a bit large.

Why not stud wall, differential movement won't be an issue if handled correctly?

 

[ban-all-sheds]

[END]Timber stud walls = work of the devil.[/OF]

 

[freddiemercurystwin]

 

[AronSearle]

Oh, quality advice then...

 

[tony1851]

Timber stud walls are often used for the inner skins of housing, where the loads supported (floors, roof etc) are higher than a simple flat roof.

Personally not a fan of stud walls for various reasons but in terms of required load-bearing capacity, they are fine.

 

[ban-all-sheds]

Oh I don't doubt their load bearing strength.

And I like a lot of proper timber-framed buildings.

I just think that a few bits of sawn softwood with plasterboard nailed over the top is the work of the devil, that's all.

 

[freddiemercurystwin]

Prey tell, please can you say why you think that?

 

[ban-all-sheds]

The practical problems of fixing things to walls, plus it just isn't right. It's not proper building - it's quick, cheap and shoddy.

 

[AronSearle]

The practical problems of fixing things to walls, plus it just isn't right. It's not proper building - it's quick, cheap and shoddy.

Fix to the studs, or plywood to the face of the studs = much easier and better to screw to.

It is only quick, cheap and shoddy, if people decide to build it that way.

 

[ban-all-sheds]

Fix to the studs,

Only if they happen to be in the right place.

or plywood to the face of the studs

Only if someone has thought to use plywood. And thought to use plywood which is at least 25mm thick.

It is only quick, cheap and shoddy, if people decide to build it that way.

And those people are in a tiny, insignificant minority, aren't they...


Sorry, but no. Solidly built walls using brick or concrete blocks are what I much prefer.

 

[ban-all-sheds]

And anyway - that green wall is now irrelevant - we've decided to have the fall away from the house, rather than from one side to the other, so I guess the joists will have to run that way, making the longest span about 5.5m.



I used to be indecisive, but now I'm not so sure....

 

[tony1851]

@BAS - stud walls have their uses. On upper floors, for example, they enable builders to position walls where convenient, which may not necessarily be directly over ground floor load-bearing walls.

And 25mm plywood wood be over the top - 1/2" ply or OSB would do. This, with the correctly spaced studs, would be OK for fixing wall units etc.