# Catnic box lintel & Padstones on single brick internal wall

#### Roger Wales

I have an internal wall separating two rooms where the wall between the room supports the upstairs floor joists and a a dividing wall between two bedrooms upstairs.
My question is that i am creating a 1500mm opening between the two rooms downstairs and i am fitting a 1950mm heavy duty catnic box lintel for support the wall is block built and the overlap of the lintel each side to rest on the remaining wall is going to be 225mm. Could you tell me whether i would need to use padstones on this width of opening and with the additional width of lintel used.
Thanks

#### Roger Wales

This is the lintel used:
Catnic BHD100 Box Lintel 1950mm

#### Bouy

No, padstones not required on lintels. To put it into perspective, with the maximum load of 39kn load allowed on your lintel the load placed on your supporting walls would be less than 1.3N/mm2, I would imagine your wall blocks will have a crushing strength of at least 3.5N/mm2

#### Roger Wales

I have ripped the coverings of what has been done and to show a pic of bricks wall is made of and box lintel used. So are you saying with an loading point width either side of 185mm is suffice.?

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#### tony1851

No, padstones not required on lintels. To put it into perspective, with the maximum load of 39kn load allowed on your lintel the load placed on your supporting walls would be less than 1.3N/mm2, I would imagine your wall blocks will have a crushing strength of at least 3.5N/mm2
With a max. reaction of 19kn (unfactored?) bearing stress would be 19x1000/250 x 100 = 0.76N/mm2, so agreed he wouldn't need padstones.

#### Roger Wales

Thank you very much for your assistance, am a new user and very impressed with fast response here.

#### Bouy

I have ripped the coverings of what has been done and to show a pic of bricks wall is made of and box lintel used. So are you saying with an loading point width either side of 185mm is suffice.?
Yes as stated even using standard 150 bearing length, 19.5 x 1000 /150 x100 = 1.3N/mm2

Thank you

#### Nakajo

Thank you very much for your assistance, am a new user and very impressed with fast response here.
We pride ourselves on speed over accuracy.

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