Unsupported 900mm opening in cavity wall

[petend]

How long would 5 course cavity wall above a 900mm opening stay up without a lintel.
The wall is bwk external and 100mm block internal

 

[jj4091]

5 course of bricks or blocks

 

[petend]

Cavity external is brick, internal is 100mm block

 

[catlad]

How can there be nothing there? how did they lay those bricks?

 

[petend]

It's an existing external door neighbour's got it into head there's no lintel, there's very slight bowing but door opens no problem, like I said if it was unsupported it would have gone long ago

 

[catlad]

like I said if it was unsupported it would have gone long ago !

When did you say this?

 

[petend]

To the neighbour, he just wants to see reassuring replies on the forum bless him

 

[cdbe]

.

How long would 5 course cavity wall above a 900mm opening stay up without a lintel.

I reckon about 300 years.

 

[petend]

Had too many vinos then sunshine

 

[cdbe]

Had too many vinos then sunshine

Could be, although I would base it on the fact that it's lasted 33 years so what's another 267? My 150 year old house was full of just timber door frames with 5 or 6 courses of brickwork on top. Bit of wood with some bricks on top was just normal for a small opening till the industry invented lintels

 

[noseall]

Self arching brickwork is nothing new, it's why bricktor was invented. But to self-arch successfully it needs a decent body of masonry above, full perp' joints, decent bonded masonry and decent muck. The risk of failure increases once any of those items are absent.

 

[petend]

Only 5 course above