Plywood subfloor

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25 Jun 2023
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I am building an outbuilding and plan to use 18mm plywood for the subfloor. The dimensions of my floor means the last row of plywood would be 380mm wide (from front to back) using full sheets for the rest of the floor is this an issue?
 
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If you are concerned about load you can always boiler plate the last joint by screwing some 3 x 2in CLS softwood, or even some 75 to 100mm wide rips of 18mm plywood, flat on to the underside of the full sheet edges (so that half the width of the boiler plate material is still visible), then fixing through the narrow plywood sheets into the boiler plates. This will stiffen the last joint considerably
 

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