Great advice & tips about garden sheds roofs before buying. the garden shed or summerhouse roof is fully exposed to all the elements whether it's rain, snow, hail or sunshine so it's vital that it is designed correctly.. At 16" centres go for 12mm ext ply for floors and roofs ext ply will last for ages in wet and dry cycles as the glue is water proof ext walls 12mm interior skin between 12 and 6mm ply dependant on weight hanging from it and battering force i used 12mm shiplap on mine. Due to requiring extra tools for cutting the sheets to size, the roofing job for the shed hasn't been completed. however in the meantime i've given some thought to this and i'm now pondering if perhaps 18mm plywood is better suited for the intended floating floor..
Buy great products from our plywood category online at wickes.co.uk. we supply trade quality diy and home improvement products at great low prices. So (part of) my plan is simply to screw some new 12mm wbp exterior plywood down on top of the old roof just to level stuff out and then apply the new felt (or whatever) on top of that. problem is that we're having frequent spells of bad weather here in the uk and i probably can't get the entire job done in one run of dry weather ! so...... Structural plywood . structural plywood is for use in all permanent structural and engineered applications. a bond is durable and permanent under conditions of full weather exposure and long term stress..
