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I'm get worried stiff reading the posts about boarding out loft spaces. Roobarb is spot on....NEVER deck out a loft space directly onto the ceiling rafters and use it for anything other than storage. The weight of the chipboard alone is surprisingly high without anything else being added. Even stored items should be evenly distributed to spread the weight.
Remember all the joints in chipboard sheets should have noggins underneath all edges to support the t&g joints....and I mean all!
The only exception to the above (as is the case with my den) is where the walls underneath - be they timber stud walls or brick - are directly below where you want your den to be. These obviously act as loadbearing supports, within reason. I was lucky, I have at least four brick walls below my den.
I don't care what argument is put forward, the only 100% correct and approved method is a proper loft conversion, where new floor timbers are usually installed independent of what's underneath. Bl***y expensive mind!
So please chaps, no more 'Dens direct on ceiling joists only' talk...It can't be safely done and someone will get hurt!
I will now remove my joiner's hat, have a beer and read how Andrew's shed idea is progressing....
As a matter of fact in my first years training as a joiner I actually fell through a ceiling at a customers house and landed on a bed with no injuries( very lucky) except to my pride and the bosses wallet.
The type of joists that you find in a loft are not designed to support the weight of a floor.The board you can buy from B&Q.Wickes etc for boarding lofts even when screwed down and interlocked it will flex when walked on causing the joists to move and the ceiling below to crack or worse (overtime the plaster board or laths will start coming away from the joists).A thicker board will add weight to the joists,but will not add strengh.They make the situation worse by adding weight to the joists something these type of joists are not designed to handle. The only way to avoid causing damage to the ceiling when installing a floor (which is what is suggested), is to strengthen and stiffen or replace the joists an alternative is to suspend the floor from the purlins or from RSJ's supported by the retaining walls.Putting it simply the issue is with the joists not the boards.I suggest you speak to a friendly builder for advice,after all this is a modeling board,it's one thing wrecking a model it's another if you bring your ceiling down. I don't speak as an expert but I do have a little knowledge and that is why I suggest you get an expert's advice.
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