How wide can joints be in mortar for dwarf wall greenhouse

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Can you explain that in English?
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Instead of filling the gap with part of a brick cut down just under the cill, can you use cut bricks laid on edge to take up one course and part of one course?

The query is about the length of the course, not the height.
 
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this is the course and it's the size of gap I want to know about!
 

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If I read this right you have dry laid the first course of bricks leaving a 10mm gap between bricks and found you have been left with a part brick gap?

In that case it is quite normal to have a wider mortar joint between each brick to lose that part brick gap
 
I laid a dry course, which had a gap, and then I 'filled' the gap by spacing the bricks on the course1 the gaps are a little more than 10mm say 14mm !
 
.....Why would it be normal to have a wider joint?
 
.....Why would it be normal to have a wider joint?

To lose the part brick gap

Standard brick length is 215mm however not all brick are exactly this length they have a tolerance , you use the mortar joint to make it to the standard length 225mm which means sometimes it is necessary to have a mortar joint bigger than 10mm
 
To lose the part brick gap

Standard brick length is 215mm however not all brick are exactly this length they have a tolerance , you use the mortar joint to make it to the standard length 225mm which means sometimes it is necessary to have a mortar joint bigger than 10mm
OK! but, how big can that mortar joint be? Also the shorter side has a gap as well, it's almost the length of a brick, would I be better having 2 smaller gaps in those courses?
 

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