Lintel overlapping a return

20 Oct 2010
Reaction score
United Kingdom
Hi all,

I am trying to maximise the width of an opening to accommodate a new folding sliding door. The lintels require 150mm minimum bearing on each side. The internal width of the room is 3190mm so I believe the maximum opening should be 2890mm. The next lintel up is 3300mm which would cause some overlap in line with the internal skin (Thermalite) of a cavity wall return on both sides (by 55mm). Bricks used on the outside skin.

Would that be ok? After all, the minimum bearing size if exceeded by 55mm.

Sponsored Links
Thats quite an opening size for a standard lintel.. unless its not carrying any load above you may want to relook at the design
Sponsored Links
the above is in plan. its from part a of the building regs

you need building control to sign this off, they will need structural calcs for the lintlel.

your structural engineer will also advise as to the size of return or brick pier required

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local