Door lintel

[DaG56]

Hi all.
I'm converting a serving hatch opening into a doorway (820 wide) & I'm after a bit of lintel advice.

The wall I'm making the doorway in is a structrual wall, it has the upstairs floor joists resting on it & is 100mm brick. The wall doesn't carry on upstairs, it only holds the weight of the upstairs floor.

The lintel above the existing serving hatch is 7" deep which seems a bit ott, but was probably used because that's what the builders had.

Wickes sell 100mm wide x 70mm deep concrete lintels, which would be convient for me to get, or I can get a 140mm deep lintel from a merchants.

Is 70mm deep likely to be strong enough for the new doorway, & what end bearing should I give? Would 100mm be ok for an end bearing.

Thankyou.

 

[noseall]

In most domestic scenarios, a 100 x 75mm pcc lintel will be ok for a standard door opening.

 

[noseall]

p.s. I would not but one from Wickes, they snap like carrots.

 

[DaG56]

p.s. I would not but one from Wickes, they snap like carrots.

Ok, thanks, I'll go elsewhere for one.

The way the upstairs joists are positioned it works out that the new opening will be centered between two of them so there is no weight over the middle of the lintel.

Will 100mm end bearing be ok?

 

[planemad]

I think that 4" is ok but I prefer 6".

 

[noseall]

100mm was ok for years, i don't think gravity has altered all that much.

 

[roughcaster]

I think that 4" is ok but I prefer 6".

said the actress to the vicar.

Roughcaster.

 

[Shytalkz]

100mm was ok for years, i don't think gravity has altered all that much.

You say that, but concrete is increasing in weight under the new Eurocodes...

 

[noseall]

I think that 4" is ok but I prefer 6".

said the actress to the vicar.

Roughcaster.

ooer!

 

[DaG56]

100mm was ok for years, i don't think gravity has altered all that much.

I got a 1050 long lintel from Jewsons (hope theirs don't snap like carrots) so I'll have about 115mm for it to sit on.

Thanks again noseall, your help was much appreciated.