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its a general note to say just what the structural open size will be, I always use a system that has stood mw well over the years, that is to use 7mm grounds on either side, 32mm thick door jambs and 3mm for the door gap, this adds up to a 910mm opening size for a 826mm door.Next we need to look at brick sizes it just so happens that 4 stretcher bricks (215+10) plus an extra joint = 910
Posted By: peterlukejenkinsyou have to add 20mm in an opening for the extra "unbuilt" joint
Posted By: peterlukejenkinsflemish bond
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