fitting a new lintel

[fabgav]

Hi all.

Installing a catnic lintel for a new doorway on external cavity wall.

The existing wall has a door way and a window as per this imagie

lintels

• fabgav
• 14 Sep 2012
• 2

The bit I am unsure of now is fitting the lintel with regards to height.

Currently the lintels are 340mm from bottom to joist above with 4 rows of bricks.

The catnic is 235mm tall.
From what i gather I should raise the lintel up and pack the bearing with slate.
So if i do this, it will leave 1 row of bricks then the top of lintel but will mean a gap of appro 25-35mm
This to mean seems to large to pack with slate!? and too small to lay a part brick.

What does anyone think?

 

[RonnyRaygun]

From what i gather I should raise the lintel up and pack the bearing with slate.
So if i do this, it will leave 1 row of bricks then the top of lintel but will mean a gap of appro 25-35mm
This to mean seems to large to pack with slate!? and too small to lay a part brick.

What does anyone think?

Use a semi dry mix mortar (1:2 mix). This will be plenty strong enough to take the load and mixing it semi-dry (so that it binds if you make a ball from it) will prevent shrinkage and cracking of the mortar.

 

[fabgav]

1 motar to 2 water?

So lift it and then pack the mortar under the bearings ?

 

[RonnyRaygun]

1 motar to 2 water?

No, 1 cement to 2 sand, to just enough water to bind the mix.

So lift it and then pack the mortar under the bearings ?

Yeah, ensure the mortar has set before removing supports.

 

[fabgav]

what about quarry tiles as packers? I has a whole floor's worth to get rid of and they will bulk out most the gap and then a slither of slate tiles?

or just stick with the mortar?

 

[RonnyRaygun]

what about quarry tiles as packers? I has a whole floor's worth to get rid of and they will bulk out most the gap and then a slither of slate tiles?

or just stick with the mortar?

Quarry tiles are plenty strong enough, but the most important thing if using them is to ensure that the load is evenly spread over the bearing and tiles. If not, you end up with areas of higher stresses which might cause the tiles to crack.

 

[fabgav]

hmm, okay thanks for all your help and info....will wait until i've got current lintels out and see what levels are like............guessing by this house.......**** lol